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Secondary battery and device comprising same

A secondary battery and conductive agent technology, applied in the field of electrochemistry, can solve the problems affecting the rate performance and cycle performance of the battery cell, peeling, low electronic conductivity, etc.

Pending Publication Date: 2021-06-04
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, silicon-based materials will undergo huge volume changes during the process of removing / intercalating lithium, which will cause electrode sheet pulverization and peeling off, and then lead to rapid capacity fading; During the discharge process, a large polarization is caused, which affects the rate performance and cycle performance of the cell.

Method used

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Examples

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Embodiment

[0067] In order to make the purpose of the invention, the technical solution and the beneficial technical effect of the present application clearer, the present application will be further described in detail below in conjunction with the examples. However, it should be understood that the embodiments of the present application are only for explaining the present application, and are not intended to limit the present application, and the embodiments of the present application are not limited to the embodiments given in the specification. The specific experimental conditions or operating conditions that are not indicated in the embodiments are made according to conventional conditions, or according to the conditions recommended by the material supplier.

[0068] 1. Preparation of batteries for testing

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Abstract

The invention relates to a secondary battery and a device comprising the same. Specifically, the secondary battery comprises a negative electrode plate, the negative electrode plate comprises a negative electrode current collector and a negative electrode diaphragm arranged on at least one surface of the negative electrode current collector, wherein the negative electrode diaphragm comprises a negative electrode active material, a conductive agent and a binder. The lithium ion battery is characterized in that the negative electrode active material comprises SiOx (x is greater than 0 and less than 2) and graphite; the average particle size Dv50 of the negative electrode active material is 8 [mu]m-14 [mu]m; the conductive agent comprises a carbon nano tube, and the length-diameter ratio of the carbon nano tube is greater than or equal to 2500: 1. The secondary battery has good rate capability and cycle performance on the premise of relatively high energy density.

Description

technical field [0001] The application belongs to the technical field of electrochemistry, and more specifically, the application relates to a secondary battery and a device containing it. Background technique [0002] With the increasingly prominent problems of energy crisis and environmental pollution, lithium-ion batteries have attracted much attention as a new type of high-energy green energy storage method, and have been widely used in electric vehicles or hybrid vehicles. With the improvement of consumers' requirements for cruising range, the development of lithium-ion batteries with high capacity has become the focus of the industry. [0003] In order to increase the energy density of lithium-ion batteries, positive and negative active materials with higher energy densities are required. For negative electrode materials, traditional graphite negative electrode materials are increasingly unable to meet the requirements of technological development. Due to its high th...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/133H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCH01M4/362H01M4/483H01M4/587H01M4/625H01M4/628H01M4/133H01M4/131H01M10/0525B82Y30/00H01M2004/027H01M2004/021H01M2220/20Y02E60/10H01M4/364H01M4/622H01M4/525H01M4/505H01M4/583H01M2004/028H01M4/64
Inventor 王丹凤闫传苗
Owner CONTEMPORARY AMPEREX TECH CO
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