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Organic coating layer, electrode material containing coating layer and lithium ion battery

A technology of electrode material and coating layer, which is applied in the field of electrochemical energy storage batteries, can solve the problems of poor lithium conduction ability and single coating method, and achieve the effect of good interface performance, excellent cycle performance and reduced side reactions

Active Publication Date: 2021-12-17
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current commercial coating methods are relatively simple, and the commonly used inorganic coatings have poor lithium-conducting ability, so they cannot meet the needs of the next generation of lithium-ion batteries.

Method used

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  • Organic coating layer, electrode material containing coating layer and lithium ion battery
  • Organic coating layer, electrode material containing coating layer and lithium ion battery
  • Organic coating layer, electrode material containing coating layer and lithium ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0078]The present invention also provides a preparation method for the above-mentioned polymer, which includes the following steps: obtaining the polymer by polymerizing a composition comprising the following components: polyester polyol, polysiloxane, electrolyte salt and diisocyanate.

[0079] According to the present invention, additives are further included in the composition.

[0080] According to the present invention, a chain extender is further included in the composition.

[0081] According to the present invention, metal chlorides are further included in the composition.

[0082] According to the present invention, the composition further includes a fast ion conductor.

[0083] According to the present invention, the definition and content of each component in the composition are as described above.

[0084] According to the invention, the polymerization is carried out in a solvent. Exemplarily, the solvent includes but not limited to acetonitrile (abbreviated as ...

Embodiment approach

[0180] According to an exemplary embodiment of the present invention, the battery comprises a positive electrode and a negative electrode of the above-mentioned organic coating layer, and an electrolyte and / or an electrolyte is contained between the positive electrode and the negative electrode;

[0181] According to an exemplary embodiment of the present invention, the battery includes the above-mentioned positive electrode of the organic coating layer, the above-mentioned negative electrode of the organic coating layer, and an electrolyte and / or electrolyte solution is contained between the positive electrode and the negative electrode;

[0182]The present invention also provides a method for preparing the above-mentioned battery, which includes sequentially stacking the positive electrode, the electrolyte and / or electrolyte solution, and the negative electrode together, and the battery can be obtained after vacuum packaging. The technical solutions of the present invention w...

Embodiment 1

[0188] Preparation of organic coating layer coated electrode active material:

[0189] (1) Dissolve 26.8g of polycaprolactone diol and 11.2g of hydroxyl-terminated polytrimethicone in ACN to form a solution with a solid content of 5%, and fully stir at 45°C for 3 hours under argon to form a precursor solution A;

[0190] (2) Add 4.4g of diphenylmethane diisocyanate and 1.2g of 4,4'-bipyridine to the above precursor solution A, and continue heating and stirring at 45°C for 1h in an argon atmosphere to form precursor solution B;

[0191] (3) Add 0.5g of 1,4-butanediol (BDO) and 6.7g of LiTFSI into the above-mentioned precursor solution B, and continue to fully stir for 6 hours to form a uniform precursor solution C;

[0192] (4) Dissolve 3 g of zinc chloride in ACN and fully stir to form a homogeneous solution with a concentration of 3%, add it to the above precursor solution C, and fully mix and stir at 500 rpm for 4 hours at room temperature;

[0193] (5) 500g of positive el...

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Abstract

The invention discloses an organic coating layer, an electrode material containing the coating layer and a lithium ion battery. The electrode coating layer is a polymer coating layer, and the polymer is obtained by polymerizing a composition comprising the following components: polyester polyol, polysiloxane, electrolyte salt, diisocyanate, an additive, a chain extender and metal chloride. The coating layer provided by the invention has crosslinking sites capable of crosslinking amorphous polymer blocks and also comprises dynamic acting forces such as hydrogen bonds and coordinate bonds, so that the tear resistance of the polymer material can be remarkably improved, the strength, ductility and toughness of the elastomer material are also remarkably improved, and the self-repairing function is realized; therefore, the generation of interface side reaction and electrode expansion can be well inhibited, and the cycle performance of the battery is improved. And meanwhile, the polymer in the coating layer can also form a synergistic effect with the lithium salt, so that the electrode has excellent ionic conductivity, and the lithium ion conductivity at an interface is further improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage batteries, in particular to an organic coating layer, an electrode material containing the coating layer, a pole piece containing the electrode material, and a lithium ion battery. Background technique [0002] Lithium battery is one of the fastest growing batteries at present. However, with the increasing market demand for lithium batteries, the safety of lithium batteries has become increasingly prominent. Many spontaneous combustion accidents in mobile phones and cars are caused by a short circuit inside the battery that generates a lot of heat, causing the internal electrolyte to decompose. At the same time, as people's requirements for the energy density of lithium-ion batteries are getting higher and higher, it is also a great challenge to the existing lithium-ion battery system. [0003] From the perspective of the positive electrode, the traditional lithium iron ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M10/0525C08G18/76C08G18/75C08G18/66C08G18/61C08G18/44C08G18/42C08G18/10C08G18/32
CPCH01M4/628H01M4/624H01M4/366H01M10/0525C08G18/4277C08G18/61C08G18/7671C08G18/12C08G18/44C08G18/758C08G18/6674C08G18/3206Y02E60/10
Inventor 张赵帅董德锐赵伟李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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