Overview of Battery Cathodes
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Elements of Electrochemistry
Page 1 of 8 Chem 201 Winter 2006 ELEM ENTS OF ELEC TROCHEMIS TRY I. Introduction A. A number of analytical techniques are based upon oxidation-reduction reactions. B. Examples of these techniques would include: 1. Determinations of Keq and oxidation-reduction midpoint potentials. 2. Determination of analytes by oxidation-reductions titrations. 3. Ion-specific electrodes (e.g., pH electrodes, etc.) 4. Gas-sensing probes. 5. Electrogravimetric analysis: oxidizing or reducing analytes to a known product and weighing the amount produced 6. Coulometric analysis: measuring the quantity of electrons required to reduce/oxidize an analyte II. Terminology A. Reduction: the gaining of electrons B. Oxidation: the loss of electrons C. Reducing agent (reductant): species that donates electrons to reduce another reagent. (The reducing agent get oxidized.) D. Oxidizing agent (oxidant): species that accepts electrons to oxidize another species. (The oxidizing agent gets reduced.) E. Oxidation-reduction reaction (redox reaction): a reaction in which electrons are transferred from one reactant to another. 1. For example, the reduction of cerium(IV) by iron(II): Ce4+ + Fe2+ ! Ce3+ + Fe3+ a. The reduction half-reaction is given by: Ce4+ + e- ! Ce3+ b. The oxidation half-reaction is given by: Fe2+ ! e- + Fe3+ 2. The half-reactions are the overall reaction broken down into oxidation and reduction steps. 3. Half-reactions cannot occur independently, but are used conceptually to simplify understanding and balancing the equations. III. Rules for Balancing Oxidation-Reduction Reactions A. Write out half-reaction "skeletons." Page 2 of 8 Chem 201 Winter 2006 + - B. Balance the half-reactions by adding H , OH or H2O as needed, maintaining electrical neutrality. -
All-Carbon Electrodes for Flexible Solar Cells
applied sciences Article All-Carbon Electrodes for Flexible Solar Cells Zexia Zhang 1,2,3 ID , Ruitao Lv 1,2,*, Yi Jia 4, Xin Gan 1,5 ID , Hongwei Zhu 1,2 and Feiyu Kang 1,5,* 1 State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; [email protected] (Z.Z.); [email protected] (X.G.); [email protected] (H.Z.) 2 Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 3 School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830046, Xinjiang Province, China 4 Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, China; [email protected] 5 Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong Province, China * Correspondences: [email protected] (R.L.); [email protected] (F.K.) Received: 16 December 2017; Accepted: 20 January 2018; Published: 23 January 2018 Abstract: Transparent electrodes based on carbon nanomaterials have recently emerged as new alternatives to indium tin oxide (ITO) or noble metal in organic photovoltaics (OPVs) due to their attractive advantages, such as long-term stability, environmental friendliness, high conductivity, and low cost. However, it is still a challenge to apply all-carbon electrodes in OPVs. Here, we report our efforts to develop all-carbon electrodes in organic solar cells fabricated with different carbon-based materials, including carbon nanotubes (CNTs) and graphene films synthesized by chemical vapor deposition (CVD). Flexible and semitransparent solar cells with all-carbon electrodes are successfully fabricated. -
A Review of Cathode and Anode Materials for Lithium-Ion Batteries
A Review of Cathode and Anode Materials for Lithium-Ion Batteries Yemeserach Mekonnen Aditya Sundararajan Arif I. Sarwat IEEE Student Member IEEE Student Member IEEE Member Department of Electrical & Department of Electrical & Department of Electrical & Computer Engineering Computer Engineering Computer Engineering Florida International University Florida International University Florida International University Email: [email protected] Email: [email protected] Email: [email protected] Abstract—Lithium ion batteries are one of the most technologies such as plug-in HEVs. For greater application use, commercially sought after energy storages today. Their batteries are usually expensive and heavy. Li-ion and Li- based application widely spans from Electric Vehicle (EV) to portable batteries show promising advantages in creating smaller, devices. Their lightness and high energy density makes them lighter and cheaper battery storage for such high-end commercially viable. More research is being conducted to better applications [18]. As a result, these batteries are widely used in select the materials for the anode and cathode parts of Lithium (Li) ion cell. This paper presents a comprehensive review of the common consumer electronics and account for higher sale existing and potential developments in the materials used for the worldwide [2]. Lithium, as the most electropositive element making of the best cathodes, anodes and electrolytes for the Li- and the lightest metal, is a unique element for the design of ion batteries such that maximum efficiency can be tapped. higher density energy storage systems. The discovery of Observed challenges in selecting the right set of materials is also different inorganic compounds that react with alkali metals in a described in detail. -
Coal As Value-Added for Lithium Battery Anodes
Coal as Value-Added for Lithium Battery Anodes Project Review Award No. DE-FE0031879 November 6th 2020 1 Project Summary • Semplastics has begun development of a novel material based on our X-MAT® polymer-derived ceramic (PDC) technology for use as an anode material in lithium-ion batteries • The X-MAT anode material is a composite of chemically tailored silicon oxycarbide (SiOC) and domestically sourced coal powder, designed to be a drop- in replacement for graphite within lithium-ion batteries • Preliminary tests of this material have shown more than twice the reversible capacity of graphite anodes • Through this project, Semplastics proposes to complete development and begin commercialization of this material 2 Project Description and Objectives 3 What are X-MAT Coal-Core Composite Powders? • Raw coal powder mixed with our proprietary polymer derived ceramic (PDC)-forming resin to produce coal-core composite powder materials – Electrically conductive – Low cost – Coal is 1-5¢/lb – The raw coal will not be burned during materials processing, and the resulting powder composite will not burn – Easily manufactured compared to typical ceramics – no sintering needed – Capable of using a variety of coals including lignite, bituminous, and anthracite particles in an “as-is” state with our proprietary PDC technology 4 How is this different from other approaches? • Our PDCs can be tuned at the Atomic Level to contain varying amounts of silicon, oxygen and carbon • Uses a “green” low-energy method – does not involve high-energy processes including -
Galvanic Cell Notation • Half-Cell Notation • Types of Electrodes • Cell
Galvanic Cell Notation ¾Inactive (inert) electrodes – not involved in the electrode half-reaction (inert solid conductors; • Half-cell notation serve as a contact between the – Different phases are separated by vertical lines solution and the external el. circuit) 3+ 2+ – Species in the same phase are separated by Example: Pt electrode in Fe /Fe soln. commas Fe3+ + e- → Fe2+ (as reduction) • Types of electrodes Notation: Fe3+, Fe2+Pt(s) ¾Active electrodes – involved in the electrode ¾Electrodes involving metals and their half-reaction (most metal electrodes) slightly soluble salts Example: Zn2+/Zn metal electrode Example: Ag/AgCl electrode Zn(s) → Zn2+ + 2e- (as oxidation) AgCl(s) + e- → Ag(s) + Cl- (as reduction) Notation: Zn(s)Zn2+ Notation: Cl-AgCl(s)Ag(s) ¾Electrodes involving gases – a gas is bubbled Example: A combination of the Zn(s)Zn2+ and over an inert electrode Fe3+, Fe2+Pt(s) half-cells leads to: Example: H2 gas over Pt electrode + - H2(g) → 2H + 2e (as oxidation) + Notation: Pt(s)H2(g)H • Cell notation – The anode half-cell is written on the left of the cathode half-cell Zn(s) → Zn2+ + 2e- (anode, oxidation) + – The electrodes appear on the far left (anode) and Fe3+ + e- → Fe2+ (×2) (cathode, reduction) far right (cathode) of the notation Zn(s) + 2Fe3+ → Zn2+ + 2Fe2+ – Salt bridges are represented by double vertical lines ⇒ Zn(s)Zn2+ || Fe3+, Fe2+Pt(s) 1 + Example: A combination of the Pt(s)H2(g)H Example: Write the cell reaction and the cell and Cl-AgCl(s)Ag(s) half-cells leads to: notation for a cell consisting of a graphite cathode - 2+ Note: The immersed in an acidic solution of MnO4 and Mn 4+ reactants in the and a graphite anode immersed in a solution of Sn 2+ overall reaction are and Sn . -
Demonstrating Solar Conversion Using Natural Dye Sensitizers
Demonstrating Solar Conversion Using Natural Dye Sensitizers Subject Area(s) Science & Technology, Physical Science, Environmental Science, Physics, Biology, and Chemistry Associated Unit Renewable Energy Lesson Title Dye Sensitized Solar Cell (DSSC) Grade Level (11th-12th) Time Required 3 hours / 3 day lab Summary Students will analyze the use of solar energy, explore future trends in solar, and demonstrate electron transfer by constructing a dye-sensitized solar cell using vegetable and fruit products. Students will analyze how energy is measured and test power output from their solar cells. Engineering Connection and Tennessee Careers An important aspect of building solar technology is the study of the type of materials that conduct electricity and understanding the reason why they conduct electricity. Within the TN-SCORE program Chemical Engineers, Biologist, Physicist, and Chemists are working together to provide innovative ways for sustainable improvements in solar energy technologies. The lab for this lesson is designed so that students apply their scientific discoveries in solar design. Students will explore how designing efficient and cost effective solar panels and fuel cells will respond to the social, political, and economic needs of society today. Teachers can use the Metropolitan Policy Program Guide “Sizing The Clean Economy: State of Tennessee” for information on Clean Economy Job Growth, TN Clean Economy Profile, and Clean Economy Employers. www.brookings.edu/metro/clean_economy.aspx Keywords Photosynthesis, power, electricity, renewable energy, solar cells, photovoltaic (PV), chlorophyll, dye sensitized solar cells (DSSC) Page 1 of 10 Next Generation Science Standards HS.ESS-Climate Change and Human Sustainability HS.PS-Chemical Reactions, Energy, Forces and Energy, and Nuclear Processes HS.ETS-Engineering Design HS.ETS-ETSS- Links Among Engineering, Technology, Science, and Society Pre-Requisite Knowledge Vocabulary: Catalyst- A substance that increases the rate of reaction without being consumed in the reaction. -
Chapter 13: Electrochemical Cells
March 19, 2015 Chapter 13: Electrochemical Cells electrochemical cell: any device that converts chemical energy into electrical energy, or vice versa March 19, 2015 March 19, 2015 Voltaic Cell -any device that uses a redox reaction to transform chemical potential energy into electrical energy (moving electrons) -the oxidizing agent and reducing agent are separated -each is contained in a half cell There are two half cells in a voltaic cell Cathode Anode -contains the SOA -contains the SRA -reduction reaction -oxidation takes place takes place - (-) electrode -+ electrode -anions migrate -cations migrate towards the anode towards cathode March 19, 2015 Electrons move through an external circuit from the anode to cathode Electricity is produced by the cell until one of the reactants is used up Example: A simple voltaic cell March 19, 2015 When designing half cells it is important to note the following: -each half cell needs an electrolyte and a solid conductor -the electrode and electrolyte cannot react spontaneously with each other (sometimes carbon and platinum are used as inert electrodes) March 19, 2015 There are two kinds of porous boundaries 1. Salt Bridge 2. Porous Cup · an unglazed ceramic cup · tube filled with an inert · separates solutions but electrolyte such as NaNO allows ions to pass 3 through or Na2SO4 · the ends are plugged so the solutions are separated, but ions can pass through Porous boundaries allow for ions to move between two half cells so that charge can be equalized between two half cells 2+ 2– electrolyte: Cu (aq), SO4 (aq) 2+ 2– electrolyte: Zn (aq), SO4 (aq) electrode: zinc electrode: copper March 19, 2015 Example: Metal/Ion Voltaic Cell V Co(s) Zn(s) Co2+ SO 2- 4 2+ SO 2- Zn 4 Example: A voltaic cell with an inert electrode March 19, 2015 Example Label the cathode, anode, electron movement, ion movement, and write the half reactions taking place at each half cell. -
Operation, Manufacturing, and Supply Chain of Lithium-Ion Batteries for Electric Vehicles
ORNL/TM-2020/1729 Operation, Manufacturing, and Supply Chain of Lithium-ion Batteries for Electric Vehicles Ilias Belharouak Jagjit Nanda Ethan Self W. Blake Hawley David Wood Zhijia Du Jianlin Li Approved for public release. Ronald L. Graves Distribution is unlimited. August 2020 DOCUMENT AVAILABILITY Reports produced after January 1, 1996, are generally available free via US Department of Energy (DOE) SciTech Connect. Website www.osti.gov Reports produced before January 1, 1996, may be purchased by members of the public from the following source: National Technical Information Service 5285 Port Royal Road Springfield, VA 22161 Telephone 703-605-6000 (1-800-553-6847) TDD 703-487-4639 Fax 703-605-6900 E-mail [email protected] Website http://classic.ntis.gov/ Reports are available to DOE employees, DOE contractors, Energy Technology Data Exchange representatives, and International Nuclear Information System representatives from the following source: Office of Scientific and Technical Information PO Box 62 Oak Ridge, TN 37831 Telephone 865-576-8401 Fax 865-576-5728 E-mail [email protected] Website http://www.osti.gov/contact.html This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. -
Questions and Answers Related to Lithium-Ion Rechargeable Battery Care
FAQ Questions and answers related to lithium-ion rechargeable battery care 1. How should I store my batteries? Lithium-ion batteries (Li-ion) should not be stored over a longer period of time either uncharged or fully charged. The optimum storage as determined by extensive experiments is with 40% to 50% capacity and at low temperatures, which should not drop below 0°C. Storage at 5°C to 10°C is optimal. As a result of self-discharge, a recharge is necessary every 12 months, at the latest. 2. Should the battery be taken from the device in case of a long period of non-use? Yes. A small current can also flow in the switched-off device, which leads to a complete discharge which, after a longer period of time, can damage the battery and at the very worst destroy it. 3. What is understood by self-discharge? In the case of lithium-ion batteries, 3% to 5% loss of charge monthly is possible the self- discharge is temperature-dependent and higher with increased temperatures. 4. What is understood by complete discharge? By complete discharge is understood the "squeezing-out" of a battery until it does not yield this any more current at all. The voltage drops to 0 volt in this case. If this status is retained, chemically reactions progress at the electrodes in the battery, which make it partially to completely unusable. The result is that the battery loses capacity massively and possibly cannot be charged up any longer. For this reason batteries should not be discharged to below a type-dependent final cut-off voltage and should be charged up again as quickly as possible. -
The Rechargeable Battery Market and Main Trends 2018-2030
The Rechargeable Battery Market and Main Trends 2018-2030 Christophe PILLOT th September 18 , 2019 Director, AVICENNE ENERGY Lyon, France Presentation Outline • The rechargeable battery market in 2018 • The Li-ion battery value chain • Li-ion battery material market Christophe PILLOT • Focus on xEV batteries + 33 1 44 55 19 90 [email protected] • Forecasts & conclusions AGENDA The market in 2018 by technology, applications & battery suppliers The Rechargeable Battery Market and Main Trends 2018 – 2030 Li-ion components market & value chain xEV market in 2018 xEV forecasts up to 2030 Lyon, France Rechargeable battery market forecasts up to 2030 September 18th, 2019 Christophe PILLOT + 33 1 44 55 19 90 [email protected] 2 OEM INVESTMENT IN VEHICLE ELECTRIFICATION Carmakers to invest more than $90 Billion in EV Ford will invest $11 billion by 2022 to launch 40 new electric cars and hybrids worldwide The Rechargeable Battery Volkswagen plan to spend $40 Billion by 2030 to build electrified versions of its 300-plus Market and Main Trends 2018 – 2030 global models Daimler will spend at least $11,7 billion to introduce 10 pure electric 40 hybrid models Nissan pledged to launch 8 new electric vehicles and hit annual sales of 1 million electrified vehicles by 2022 Toyota will launch 10 Evs by the early 2020s and sell 5,5 million electrified vehicles, including Lyon, France hybrids and hydrogen fuel cell vehicles, by 2030 September 18th, 2019 BMW will offer 25 electrified (12 fully electric) vehicles by 2025 GM pledging to sell 20 all-electric -
Lithium Batteries
LITHIUM BATTERIES 1. Introduction Over the past 20 years, lithium battery technology has dramatically evolved, providing increasingly greater energy density, greater energy per volume, longer cycle life and improved reliability. Lithium is the lightest of all metals, has the greatest electrochemical potential and provides the largest specific energy per weight. Lithium batteries are now powering a wide range of electrical and electronical devices, including laptop computers, mobile phones, power tools, telecommunication systems and new generations of electric cars and vehicles. Next to advantages, new technologies often bring new challenges and risks. Reports on incidents with lithium batteries catching fire have made the public well aware of their flammability hazard and have triggered massive research on the mechanisms initiating such events and the ways to make operation, storage, transportation and recycling safer. This document covers some of the safety related issues of lithium batteries. 2. Types of Lithium Batteries 2.1 Cell or Battery? Although the word "battery" is a common term to describe an electrochemical storage system, international industry standards differentiate between a "cell" and a "battery". A cell is a single encased electrochemical unit (one positive and one negative electrode) with a voltage differential across its two terminals (Figure 1). Figure 1: Examples of cells A battery is two or more cells that are electrically connected together and fitted with devices such as a case, terminals, marking and protective devices that it needs to function properly (Figure 2). EHS-DOC-147 v.2 1 / 18 Figure 2: Examples of batteries However, in common usage, the terms "cell" and "battery" are used interchangeably. -
Battery Technologies for Small Scale Embeded Generation
Battery Technologies for Small Scale Embedded Generation. by Norman Jackson, South African Energy Storage Association (SAESA) Content Provider – Wikipedia et al Small Scale Embedded Generation - SSEG • SSEG is very much a local South African term for Distributed Generation under 10 Mega Watt. Internationally they refer to: Distributed generation, also distributed energy, on-site generation (OSG) or district/decentralized energy It is electrical generation and storage performed by a variety of small, grid- connected devices referred to as distributed energy resources (DER) Types of Energy storage: • Fossil fuel storage • Thermal • Electrochemical • Mechanical • Brick storage heater • Compressed air energy storage • Cryogenic energy storage (Battery Energy • Fireless locomotive • Liquid nitrogen engine Storage System, • Flywheel energy storage • Eutectic system BESS) • Gravitational potential energy • Ice storage air conditioning • Hydraulic accumulator • Molten salt storage • Flow battery • Pumped-storage • Phase-change material • Rechargeable hydroelectricity • Seasonal thermal energy battery • Electrical, electromagnetic storage • Capacitor • Solar pond • UltraBattery • Supercapacitor • Steam accumulator • Superconducting magnetic • Thermal energy energy storage (SMES, also storage (general) superconducting storage coil) • Chemical • Biological • Biofuels • Glycogen • Hydrated salts • Starch • Hydrogen storage • Hydrogen peroxide • Power to gas • Vanadium pentoxide History of the battery This was a stack of copper and zinc Italian plates,