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Crosslinkable binder composition for negative electrode, negative electrode active material slurry, negative electrode, negative electrode preparation method and lithium ion battery

A negative electrode active material and composition technology, which is applied in the field of binders for lithium ion battery negative electrode materials, can solve the problems of poor battery cycle performance, and achieve the effect of both strength and elasticity and good elasticity

Active Publication Date: 2022-08-09
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of poor cycle performance of batteries using polyacrylic acid type binders, to provide crosslinkable binder compositions for negative electrodes, negative electrode active material slurry, negative electrodes, negative electrode preparation methods and lithium ion batteries

Method used

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  • Crosslinkable binder composition for negative electrode, negative electrode active material slurry, negative electrode, negative electrode preparation method and lithium ion battery
  • Crosslinkable binder composition for negative electrode, negative electrode active material slurry, negative electrode, negative electrode preparation method and lithium ion battery
  • Crosslinkable binder composition for negative electrode, negative electrode active material slurry, negative electrode, negative electrode preparation method and lithium ion battery

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preparation example Construction

[0048] A fourth aspect of the present invention provides a method for preparing a negative electrode, comprising:

[0049] (1) mixing an aqueous solution containing a polyacrylic acid polymer and a polyol crosslinking agent with a conductive agent and an active material to obtain a dispersion;

[0050] (2) mixing the dispersion with the carboxyl-containing elastomer and sieving to obtain a slurry;

[0051] (3) Coating the slurry on the current collector and baking and baking to form a negative electrode active material layer to obtain a negative electrode.

[0052] In some embodiments of the present invention, preferably, the baking temperature is 80-120° C.; the baking is performed under vacuum conditions and 130-180° C. for 1-10 hours.

[0053] The polyacrylic acid polymer, polyol crosslinking agent, and carboxyl group-containing elastomer are as described above, and will not be repeated here.

[0054] In some embodiments of the present invention, through the drying and ba...

Embodiment 1

[0066] Take 1.8g polyacrylic acid (weight average molecular weight is 200,000), 0.4g polyvinyl alcohol (weight average molecular weight is 35,000, alcoholysis degree is 88%), and dissolve together in water; after the dissolution is complete, add 1g conductive carbon black Super_P Stir and disperse with 0.1g carbon nanotube CNT for 0.5h, rotating speed 2000rpm; add 15g silicon oxide SiOx powder and 85g natural graphite in turn, continue to stir and disperse for 1.5h, rotating speed 2000rpm; then add 3.6g carboxyl styrene-butadiene rubber emulsion (carboxyl group accounts for the total The molar percentage of the carboxylated styrene-butadiene rubber latex is 5%, and the molar ratio of butadiene units to styrene units is 7:3; the weight-average molecular weight of the carboxylated styrene-butadiene rubber is 1.5 million; the solid content of the carboxylated styrene-butadiene rubber latex is 50wt %), stirred for 1h, rotating speed 1200rpm;

[0067] The prepared slurry was passed...

Embodiment 2

[0070] According to the method of embodiment 1, the difference is, with carboxylated styrene-butadiene rubber latex (wherein, the molar percentage of carboxyl group in total carboxylated styrene-butadiene rubber latex is 10%, and the molar ratio of butadiene unit and styrene unit is 7:3 The weight-average molecular weight of carboxylated styrene-butadiene rubber is 1.5 million; the solid content of carboxylated styrene-butadiene rubber latex is 50wt%), replacing carboxylated styrene-butadiene rubber latex (wherein, the molar percentage that carboxyl groups account for total carboxylated styrene-butadiene rubber latex is 5%, The molar ratio of the butadiene unit to the styrene unit is 7:3; the weight average molecular weight of the carboxylated styrene-butadiene rubber is 1.5 million; the solid content of the carboxylated styrene-butadiene rubber emulsion is 50 wt %).

[0071] A negative electrode sheet S2 was prepared.

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Abstract

The invention relates to the field of binders for negative electrode materials of lithium ion batteries, and discloses a crosslinkable negative electrode binder composition, negative electrode active material slurry, negative electrode, a negative electrode preparation method and a lithium ion battery. The crosslinkable binder composition for negative electrodes comprises a polyacrylic polymer, a carboxyl group-containing elastomer and a polyol crosslinking agent; wherein, the hydroxyl groups contained in the polyol crosslinking agent are combined with the polyacrylic polymer The carboxyl group contained in the carboxyl group and the carboxyl group contained in the carboxyl group-containing elastomer react to form an ester group, and the polyol cross-linking agent can connect the polyacrylic polymer and the carboxyl group-containing elastomer to form a cross-linked polymer. The cross-linked polymer formed by the composition has both strength and elasticity, and overcomes the influence of expansion and contraction on the silicon negative electrode.

Description

technical field [0001] The invention relates to the field of binders for negative electrode materials of lithium ion batteries, in particular to a crosslinkable binder composition for negative electrodes, negative electrode active material slurry, negative electrodes, a method for preparing negative electrodes and lithium ion batteries. Background technique [0002] Silicon has become a research hotspot in recent years as a new generation of high-energy-density lithium-ion battery anode materials. However, silicon will produce a huge volume change during cycling, which will lead to the pulverization of silicon particles, which in turn leads to the loss of electrical contact between silicon particles and the conductive agent, which destroys the entire electrode structure, resulting in capacity attenuation and poor cycling performance. Limiting the good performance of silicon in lithium-ion batteries. Although the modified silicon-based material can effectively relieve the me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/66H01M10/0525
CPCH01M4/621H01M4/622H01M10/0525H01M4/667Y02E60/10
Inventor 钟毅杨吉祥潘仪
Owner BYD CO LTD
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