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Negative pole piece and secondary battery

A technology of negative pole piece and negative film piece, applied in the field of electrochemistry, can solve the problems of metal precipitation, affecting the cycle and safety of the battery cell, and achieve the effect of high energy density and long cycle life

Active Publication Date: 2021-03-30
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the negative electrode cannot withstand high current charging, there will be metal precipitation during fast charging, and a large number of by-products will be produced on the surface of the negative electrode, which will affect the cycle and safety of the battery cell

Method used

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  • Negative pole piece and secondary battery

Examples

Experimental program
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Effect test

preparation example Construction

[0042] Methods for the preparation of these materials are well known and commercially available. Those skilled in the art can make appropriate choices according to the actual use environment.

[0043] Unless otherwise specified, various parameters involved in this specification have common meanings known in the art and can be measured by methods known in the art. For example, it can be tested according to the methods given in the examples of the present invention.

[0044]The negative electrode sheet of the present invention can be prepared by a known method in the art. Usually, materials such as negative electrode active material and optional conductive agent (such as carbon materials such as carbon black and metal particles, etc.), binder (such as SBR), other optional additives (such as PTC thermistor material) are mixed in Disperse together in a solvent (such as deionized water), stir evenly, and evenly coat on the negative electrode current collector. After drying, the n...

Embodiment

[0070]In order to make the object, technical solution and beneficial technical effect of the present invention clearer, the present invention will be further described in detail below in conjunction with examples. However, it should be understood that the embodiments of the present invention are only for explaining the present invention rather than limiting the present invention, and the embodiments of the present invention 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.

[0071] 1. Preparation of batteries for testing

[0072] The batteries of Examples 1-13 and Comparative Examples 1-6 were prepared according to the following method:

[0073] A) Preparation of positive electrode sheet:

[0074] Mix the positive electrode active material (see Ta...

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Abstract

The invention relates to a negative pole piece and a secondary battery. Specifically, the present invention provides a negative electrode sheet, comprising a negative electrode current collector and a negative electrode film coated on at least one surface of the negative electrode current collector and containing a negative electrode active material, characterized in that: the negative electrode sheet satisfies 0.6 ≤0.7×P×(D90‑D10) / D50+B / 3≤8.0; where P refers to the porosity of the negative electrode diaphragm; B refers to the active specific surface area of ​​the negative electrode diaphragm, in cm 2 / g; D10 refers to the particle size corresponding to when the cumulative volume percentage of the negative active material reaches 10%, D90 refers to the corresponding particle size when the cumulative volume percentage of the negative active material reaches 90%, and D50 refers to the cumulative volume percentage of the negative active material reaches The particle size corresponding to 50%, that is, the median particle size of the volume distribution, the units of D10, D90, and D50 are all μm. The negative electrode sheet can make the secondary battery containing it have the characteristics of high energy density, fast charging, long cycle life and the like.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and more specifically, the invention relates to a negative electrode sheet for a secondary battery and related secondary batteries. Background technique [0002] New energy vehicles represent the development direction of the world's automobile industry. As a new type of high-voltage, high-energy-density rechargeable battery, secondary batteries have outstanding features such as light weight, high energy density, no pollution, no memory effect, and long service life, so they are widely used in new energy vehicles. [0003] However, long charging time is one of the important factors limiting the rapid popularization of new energy vehicles. In terms of technical principles, the core of fast charging technology is to increase the movement speed of ions between the positive and negative electrodes through chemical system coordination and design optimization. If the negative electrode cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/70H01M10/36H01M4/13
CPCH01M4/13H01M4/667H01M4/70H01M10/36H01M4/133H01M4/0404H01M2004/021H01M10/0525Y02E60/10Y02P70/50H01M4/045H01M10/045H01M10/049
Inventor 申玉良康蒙王家政何立兵
Owner CONTEMPORARY AMPEREX TECH CO