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Preparation method of lithium ion battery solid electrolyte interface layer, and lithium ion battery

A solid electrolyte and lithium-ion battery technology, applied in the direction of non-aqueous electrolyte batteries, electrolyte battery manufacturing, secondary batteries, etc., can solve the problems of uniform and dense solid electrolyte film, the inability to guarantee the coating layer, and the accuracy of coating equipment. Achieve the effects of excellent electronic insulation and ion conductivity, great promotion and application value, and convenient operation

Active Publication Date: 2019-03-08
成都市银隆新能源产业技术研究有限公司 +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in order to effectively prevent the formation of lithium dendrites, most of them use the method of coating solid electrolyte films on the positive and negative electrodes of lithium-ion batteries, but due to the limitation of coating equipment Accuracy problem, unable to guarantee that the coating layer is a uniform and dense solid electrolyte film

Method used

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  • Preparation method of lithium ion battery solid electrolyte interface layer, and lithium ion battery
  • Preparation method of lithium ion battery solid electrolyte interface layer, and lithium ion battery

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preparation example Construction

[0037]A method for preparing a solid electrolyte interface layer of a lithium-ion battery provided in this embodiment, the specific steps are as follows:

[0038] S1. Under preset temperature conditions, place the negative pole piece in a nitrogen atmosphere;

[0039] S2, putting the negative pole piece into lithium hydroxide solution for surface adsorption;

[0040] S3, placing the negative electrode sheet after the adsorption in step 2 in a nitrogen atmosphere;

[0041] S4, put the negative pole piece after step 3 into H 3 PO 4 surface adsorption in solution.

[0042] Repeat step 1 to step 4, and the number of cycles is 5 to 30 times. Preferably, the number of cycles may also be 10 to 20 times.

[0043] Wherein, in step 1, the preset temperature is -50°C to -30°C. Preferably, in this embodiment, the preset temperature is controlled at the dew point temperature of -40°C, and the nitrogen atmosphere uses high-purity nitrogen, that is, nitrogen with a purity greater than 9...

Embodiment 1

[0055] The positive electrode of the lithium-ion battery is composed of NCM, Super-P, PVDF, and the negative electrode is composed of artificial graphite, Super-P, SBR, and CMC. Deposit a layer of solid electrolyte LiPON on the surface of the pole piece, specifically, cycle the above steps 1 to 4, the number of cycles is 10 times, and then perform rolling, winding, baking, liquid injection, aging, and chemical formation.

Embodiment 2

[0057] The positive electrode of the lithium-ion battery is composed of NCM, Super-P, PVDF, and the negative electrode is composed of artificial graphite, Super-P, SBR, and CMC. Roasting, liquid injection, aging, chemical formation.

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Abstract

The invention provides a preparation method of a lithium ion battery solid electrolyte interface layer, and a lithium ion battery, related to the technical field of battery preparation. In the preparation method of the lithium ion battery solid electrolyte interface layer, a successive ionic layer adsorption reaction method is used, a compact solid electrolyte interface layer is deposited on a surface of a negative pole piece, the solid electrolyte interface layer mainly comprises LiPON, the LiPON has stable property for H2O, O2 and electrolyte solution, thus, generation of side reaction is avoided, the electrolyte solution is prevented from reacting with the negative pole piece and the solid electrolyte interface layer, and capacity, rate capability and thermal stability of the battery are improved effectively. For the lithium ion battery provided by the invention, the compact solid electrolyte interface layer is formed on the surface of the negative pole piece through the method above, so the lithium ion battery has relatively higher battery rate capability, potential safety hazard caused by lithium dendrites is also reduced at the same time, and safety is higher.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a preparation method of a solid electrolyte interface layer of a lithium ion battery and the lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used because of their ultra-high energy density, but lithium ions are prone to form lithium dendrites during the repeated intercalation process. Lithium dendrites not only affect the battery capacity, but more importantly, cause safety hazards. Therefore, preventing the formation of lithium dendrites is one of the important problems to be solved in the application process of lithium-ion batteries. [0003] At present, in order to effectively prevent the formation of lithium dendrites, the method of coating solid electrolyte films on the positive and negative electrodes of lithium-ion batteries is mostly used. However, due to the accuracy of coating equipment, it is impossible to ensure th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/42
CPCH01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 赖信华国海超高峰
Owner 成都市银隆新能源产业技术研究有限公司
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