Negative electrode and preparation method and application thereof

A negative electrode and negative electrode active technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of ineffective control of thermal runaway, slow release speed of flame retardants, slow reaction speed, etc., to curb the generation and spread of open flames , reduce the risk, delay the effect of the fire

Pending Publication Date: 2022-08-05
SHANGHAI RUIPU ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the capsule shell material melts first, and the capsule shell material will block the release of the flame retardant and the full contact with the chemical reactants; on the other hand, the release rate of the flame retardant is too slow, far slower than the reaction rate of thermal runaway , thus leading to ineffective control of thermal runaway

Method used

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  • Negative electrode and preparation method and application thereof
  • Negative electrode and preparation method and application thereof
  • Negative electrode and preparation method and application thereof

Examples

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Embodiment 1

[0052] This embodiment provides a negative electrode, the negative electrode is composed of copper foil and negative electrode active layers located on both sides of the copper foil; the negative electrode active layer includes artificial graphite, thermal initiator, hydroxymethyl cellulose (CMC), styrene-butadiene rubber ( SBR) and conductive carbon black (SP) (mass ratio 83:10:2:2:3);

[0053] Among them, the thermal initiator is a carbon material obtained by carbonizing polystyrene at 350° C., D50 is 1 μm, and D50 of artificial graphite is 15 μm.

[0054] The preparation method of the negative electrode is as follows:

[0055] (1) Disperse the thermal initiator in N-methylpyrrolidone (NMP), place the dispersed solution in a closed container under the condition of stirring in a water bath at 45°C, and mix it well by stirring for 3 hours to obtain a dispersed solution. At the same time, artificial graphite, CMC, SBR and SP are mixed with water to obtain mixed slurry (guarant...

Embodiment 2

[0059] This embodiment provides a negative electrode, the negative electrode is composed of copper foil and negative electrode active layers located on both sides of the copper foil; the negative electrode active layer includes hard carbon, thermal initiator, hydroxymethyl cellulose (CMC), styrene-butadiene rubber ( SBR) and conductive carbon black (SP) (mass ratio is 88:5:2:2:3);

[0060] Among them, the thermal initiator is a carbon material obtained by carbonizing polystyrene at 400° C., D50 is 500 nm, and D50 of hard carbon is 8 μm.

[0061] The preparation method of the negative electrode is as follows:

[0062] (1) Disperse the thermal initiator in N-methylpyrrolidone (NMP), place the dispersed solution in a closed container under the condition of stirring in a water bath at 45°C, and mix it well by stirring for 3 hours to obtain a dispersed solution. liquid; at the same time, hard carbon, thermal initiator, hydroxymethyl cellulose (CMC), styrene-butadiene rubber (SBR) ...

Embodiment 3

[0065] This embodiment provides a negative electrode, the negative electrode is composed of copper foil and negative electrode active layers located on both sides of the copper foil; the negative electrode active layer includes artificial graphite, thermal initiator, hydroxymethyl cellulose (CMC), styrene-butadiene rubber ( SBR) and conductive carbon black (SP) (mass ratio of 91:2:2:2:3);

[0066] Among them, the thermal initiator is a carbon material obtained by carbonizing polystyrene at 350° C., D50 is 1 μm, and D50 of artificial graphite is 5 μm.

[0067] The preparation method of the negative electrode is as follows:

[0068] (1) Disperse the thermal initiator in N-methylpyrrolidone (NMP), place the dispersed solution in a closed container under the condition of stirring in a water bath at 45°C, and mix it well by stirring for 3 hours to obtain a dispersed solution. At the same time, artificial graphite, SBR and SP are mixed with water to obtain mixed slurry (guaranteed ...

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Abstract

The invention provides a negative electrode and a preparation method and application thereof. The negative electrode comprises a negative electrode current collector and a negative electrode active layer located on the surface of the negative electrode current collector, the negative electrode active layer comprises a negative electrode active substance, a binder, a conductive agent and a thermal initiator, and the thermal initiator comprises a carbon material which reacts in an oxygen-deficient environment. A carbon material which reacts in an oxygen-deficient environment is added into the negative electrode active layer. Once the battery cell is subjected to continuous thermal runaway and the explosion-proof valve bursts, the carbon material can be decomposed at high temperature to generate carbon dioxide gas, so that a large amount of carbon dioxide gas can be accumulated in the battery cell, the effect of restraining generation and spreading of open fire is achieved, the risk caused by thermal runaway is effectively reduced to a great extent, the fire behavior is delayed, and the service life of the battery cell is prolonged. The processing time is bought for the system, so that the thermal stability of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a negative electrode and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in energy storage and power markets due to their lightness, long battery life and long life. However, due to some physical and chemical reasons during the use of lithium batteries, once thermal runaway occurs, catastrophic accidents are very likely to occur. [0003] At present, the inside of the cell is basically isolated from oxygen. In the process of intense heat generation of the cell to the occurrence of sparks, it is often impossible to give early warning and intervention, resulting in the final cell fire and burning. [0004] Conventional thermal runaway prevention methods can be divided into three categories: first, to prevent abuse. For example, the installation of circuit fuses, mechanical coatings to improve mechanical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M10/0525Y02E60/10
Inventor 张蒙刘婵侯敏曹辉
Owner SHANGHAI RUIPU ENERGY CO LTD
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