A kind of lithium-ion battery high safety negative electrode slurry binder

A lithium-ion battery and negative electrode slurry technology, which is applied in the direction of battery electrodes, conductive adhesives, non-polymer adhesive additives, etc., can solve the problem of not being able to apply high energy and high power, and not being able to block heat generation side reactions, Improve the limited effect and other problems, and achieve the effects of recycling, repairing and reusing, good bonding performance, and improving safety performance

Active Publication Date: 2018-06-05
长兴天晟能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the ceramic-coated diaphragm can only improve the thermal stability of the diaphragm, it cannot block the side reaction of heat generation, so its improvement effect is limited.
At present, it can only solve the safety problem of batteries with an energy density of no more than 200wh / kg; method 2 can partially contain the thermal runaway reaction of the battery, but because the electrodes of lithium-ion batteries are usually porous electrodes, the electrolyte is filled in the abundant electrode gaps; although The conduction of lithium ions between the positive and negative electrodes is blocked, but the reaction between the active material inside the electrode and the electrolyte is still going on, which will further lead to heat accumulation and trigger a thermal runaway reaction. Method 2 cannot be applied to high-energy and high-power lithium Ion battery system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A high-safety negative electrode slurry binder for lithium ion batteries, prepared from the following raw materials in parts by weight:

[0031] 3 parts of sodium carboxymethyl cellulose, 6 parts of styrene-butadiene rubber, 3.5 parts of sodium alginate, 2 parts of binder additive;

[0032] Wherein, the binder additive is made by 7 parts by weight of polyvinylidene fluoride, 3 parts by weight of conductive agent and 1.5 parts by weight of dispersant; the conductive agent in the binder additive is conductive graphite, and the conductive agent in the binder additive is 300 mesh; the dispersant in the binder additive is polymethyl acrylate;

[0033] The binder additive is produced by the following steps:

[0034] a) Bake the polyvinylidene fluoride at 220°C for 30 minutes, and then quench it in water at 30°C;

[0035] b) Polarize the quenched polyvinylidene fluoride under a polarizing electric field of 2MV / cm for 12 minutes, and then crush it to 250 mesh;

[0036] c) Mi...

Embodiment 2

[0039] A high-safety negative electrode slurry binder for lithium ion batteries, prepared from the following raw materials in parts by weight:

[0040] 2 parts of sodium carboxymethyl cellulose, 5 parts of styrene-butadiene rubber, 3 parts of sodium alginate, 1.5 parts of binder additive;

[0041] Wherein, the binder additive is made from 6 parts by weight of polyvinylidene fluoride, 2 parts by weight of a conductive agent and 1 part by weight of a dispersant; the conductive agent in the binder additive is conductive graphite, and the conductive agent in the binder additive is 200 mesh; the dispersant in the binder additive is 10wt% polyacrylamide aqueous solution;

[0042] The binder additive is produced by the following steps:

[0043] a) Baking PVDF at 190°C for 10 minutes, then quenching in water at 10°C;

[0044] b) Polarize the quenched polyvinylidene fluoride under a polarizing electric field of 1MV / cm for 5 minutes, and then crush it to 200 mesh;

[0045] c) Mix the...

Embodiment 3

[0048] A high-safety negative electrode slurry binder for lithium ion batteries, prepared from the following raw materials in parts by weight:

[0049]3 parts of sodium carboxymethyl cellulose, 6 parts of styrene-butadiene rubber, 3.5 parts of sodium alginate, 2 parts of binder additive;

[0050] Wherein, the binder additive is made from 7 parts by weight of polyvinylidene fluoride, 3 parts by weight of a conductive agent and 1.5 parts by weight of a dispersant; the conductive agent in the binder additive is Ketjen Black, and the conductive agent in the binder additive It is 300 mesh; the dispersant in the binder additive is 13wt% polyacrylamide aqueous solution;

[0051] The binder additive is produced by the following steps:

[0052] a) Bake the polyvinylidene fluoride at 220°C for 30 minutes, and then quench it in water at 30°C;

[0053] b) Polarize the quenched polyvinylidene fluoride under a polarizing electric field of 2MV / cm for 15 minutes, and then crush it to 250 me...

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PUM

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Abstract

The invention relates to the technical field of lithium ion battery manufacturing. The invention discloses a high safety cathode slurry adhesive for lithium ion batteries; the high safety cathode slurry adhesive is prepared from the following raw materials: sodium carboxymethyl cellulose, butadiene styrene rubber, sodium alginate, adhesive additives and the like. The cathode slurry adhesive provided by the invention has better bonding performance, is capable of enabling negative active materials to be better and more evenly bonded together, and is also suitable for batteries needing higher cycle performance. The cathode slurry adhesive can improve the safety performance of cathode slurry, and enables the assembled lithium ion batteries to automatically stop an exothermic reaction at high temperature so as to guarantee the use safety of the lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a high-safety negative electrode slurry binder for lithium-ion batteries. Background technique [0002] In recent years, the rapid development of portable electronic products, electric vehicles, energy storage power stations and other fields has put forward higher requirements for energy storage technology. Lithium-ion batteries are the first choice in these fields due to their high energy density, and their energy density is getting higher. As the energy density of lithium-ion batteries is getting higher and higher, the safety problems it faces are becoming more and more severe, which has severely limited the terminal use of high-energy-density lithium-ion batteries. [0003] The safety problem of lithium-ion batteries is mainly due to the thermal runaway of batteries. Due to the abnormal heat generation reaction inside the battery, the internal tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J109/06C09J101/28C09J105/04C09J9/02C09J11/04H01M10/0525H01M4/62
CPCC08K2201/001C08L2203/20C08L2205/035C09J9/02C09J11/04C09J109/06H01M4/621H01M10/0525C08L1/286C08L5/04C08L27/16C08L33/08C08L33/26C08K3/04Y02E60/10
Inventor 佘海中
Owner 长兴天晟能源科技有限公司
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