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Conductive coating for positive electrode of lithium ion battery and preparation method thereof, positive electrode sheet of lithium ion battery and preparation method thereof, and lithium ion battery

A technology of lithium-ion batteries and conductive coatings, applied in the directions of battery electrodes, non-aqueous electrolyte battery electrodes, electrode carriers/collectors, etc., can solve the problems of poor battery performance, high environmental and human toxicity, and reduce battery internal resistance. Improved cycle life, improved adhesion and electrical connectivity

Active Publication Date: 2017-08-22
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention solves the technical problems that the oil-based conductive coating system is highly toxic to the environment and the human body, and the water-based conductive coating system has many adverse effects on lithium-ion batteries in the prior art, resulting in poor battery performance, and provides a new type of lithium-ion battery. Conductive coating for ion battery and preparation method thereof, lithium ion battery positive plate and preparation method thereof, and lithium ion battery

Method used

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  • Conductive coating for positive electrode of lithium ion battery and preparation method thereof, positive electrode sheet of lithium ion battery and preparation method thereof, and lithium ion battery
  • Conductive coating for positive electrode of lithium ion battery and preparation method thereof, positive electrode sheet of lithium ion battery and preparation method thereof, and lithium ion battery

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preparation example Construction

[0028] The present invention also provides a kind of preparation method of above-mentioned lithium-ion battery positive electrode conductive paint, comprising the following steps:

[0029] A10, adding the polyolefin resin containing carboxylic acid groups into the alkaline aqueous solution until the reaction is completed to obtain an aqueous binder solution; the alkaline aqueous solution is ammonia or organic amine aqueous solution;

[0030] A20. Add a crosslinking agent, a swelling agent and a conductive agent to the aqueous binder solution in step A10, and obtain the conductive coating after ball milling.

[0031] Wherein, the ammonia water or organic amine aqueous solution reacts with carboxylic acid groups to form an amide structure, that is, to obtain a polyolefin resin (ie, binder) containing amide groups. As mentioned earlier, the amide group will decompose during curing, a part of it will be converted into a carboxylic acid group and remain in the polyolefin resin stru...

Embodiment 1

[0046] (1) Preparation of conductive coating S1

[0047] Add ethylene-acrylic acid copolymer to ammonia solution (the molar ratio of ammonia water to carboxylic acid group is 1:1.2), stir vigorously at 125°C until it is completely dissolved; then add pentaerythritol-tris(3-aziridinyl) ) propionate, polyvinylpyrrolidone, graphite, Tamol N and BYK 019, sanding 1h with a sand mill to obtain the conductive coating S1 of the present embodiment, which consists of: the binder is ethylene-containing amide group 13 parts by weight of acrylic acid copolymer (wherein the content of amide group is 6.25wt%), the crosslinking agent is 0.7 parts by weight of pentaerythritol-tris(3-aziridinyl) propionate, and the swelling agent is 5.9 parts by weight of polyvinylpyrrolidone 67 parts by weight of water, 13 parts by weight of graphite as the conductive agent, 0.1 part by weight of Tamol N as the dispersant, and 0.3 parts by weight of BYK 019 as the defoamer.

[0048] (2) Preparation of conduct...

Embodiment 2

[0053] (1) Preparation of conductive coating S2

[0054] Add styrene-ethylene-acrylic acid copolymer to triethylamine aqueous solution (the molar ratio of triethylamine to carboxylic acid group is 1:1.1), stir vigorously at 100°C until it is completely dissolved; then add trimethylol to it Propane-tris[3-(2-methylaziridinyl)]propionate, acrylic acid-vinylpyrrolidone copolymer, graphite, conductive carbon black, Tamol 850 and DF66 were ball milled for 3h with a planetary ball mill to obtain the present implementation The conductive coating S2 of example, its composition is: binder is the styrene-ethylene-acrylic acid copolymer containing amide group (wherein the content of amide group is 15.625wt%) 24.8 parts by weight, cross-linking agent is trimethylol 4.2 parts by weight of propane-tris[3-(2-methylaziridinyl)] propionate, 9.1 parts by weight of vinylpyrrolidone-acrylic acid copolymer as the swelling agent, 40.2 parts by weight of water, and 15.2 parts by weight of graphite a...

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Abstract

The invention provides a conductive coating for a lithium ion battery electrode and a preparation method for the conductive coating, a lithium ion battery positive plate and a preparation method therefor, and a lithium ion battery. The conductive coating comprises a binder, a cross-linking agent, a swelling agent, a conductive agent and water; and the binder is polyolefin resin containing amide groups. The conductive coating layer formed by the conductive coating provided by the invention is extremely high in cohesiveness with a current collector; and meanwhile, the conductive coating layer is high in conductivity and thermal resistance; and in addition, high dispersion and interpenetration between the conductive coating layer and the electrode coating can be realized so as to improve the adhesion adaptation and electric connection between the electrode layer and the current collector, reduce the internal resistance of the battery and prolong the cycle life of the battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a conductive coating for a positive electrode of a lithium ion battery and a preparation method thereof, a positive electrode sheet of a lithium ion battery and a preparation method thereof, and a lithium ion battery. Background technique [0002] With the increasing shortage of traditional resources and energy and the increasingly serious environmental problems, sustainable development has become a new concept for the development of human society, and the development of new energy storage and conversion technologies has become the focus of energy strategies of various countries. Among the secondary power supply technologies, lithium-ion batteries have become the most promising technology in the new era due to their high energy density, high operating voltage, long cycle life, and low self-discharge. At present, the electrode current collector materials of lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/13H01M4/139H01M4/02
CPCY02E60/10
Inventor 陈小芳苗伟峰周维
Owner BYD CO LTD