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High safety cathode slurry adhesive for lithium ion batteries

A technology for lithium ion battery and negative electrode slurry, which is applied in battery electrodes, conductive adhesives, non-polymer adhesive additives, etc., can solve thermal runaway reactions, has limited improvement effect, and cannot block heat generating side reactions, etc problems, to achieve good bonding performance, improve safety performance, and ensure the effect of safety

Active Publication Date: 2017-05-17
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

Benefits of technology

This patented technology improves upon existing binders used for making positive elec trodes by providing stronger adhesion between them while still allowing for even distribution throughout their volume during production process. It allows for safer operation with longer cycles without losing power or causing damage from overheating.

Problems solved by technology

This patented technical solution described in the text discusses how safe handling of laminate type secondary cells (LSCs) becomes important when they come into play at very large levels such as those found within mobile devices like smart phones that require longer periods during chargings compared to traditional small consumer electronics applications where long hours may result in fires or explosions. Current solutions involve adding insulating materials around each cell, reducing the risk of overheated events from happening outside the device itself while also improving the overall performance of LSICs.

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

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Claims

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Application Information

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Owner 长兴天晟能源科技有限公司
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