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Non-contact mixed solid-liquid electrolyte lithium storage battery and preparation method thereof

A non-contact, lithium battery technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, lithium batteries, etc., can solve problems such as short circuit and affect the safety performance of lithium batteries, so as to slow down the impact, improve electrical cycle performance, and excellent conductivity rate effect

Active Publication Date: 2019-08-09
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, during the charging process of lithium batteries, lithium ions will be reduced to form dendritic lithium dendrites. As the number of lithium ions charged increases, lithium dendrites will continue to grow and pierce the separator or solid electrolyte layer, causing the positive and negative electrodes to be connected to each other. A short circuit occurs, which affects the safety performance of the lithium battery.

Method used

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  • Non-contact mixed solid-liquid electrolyte lithium storage battery and preparation method thereof
  • Non-contact mixed solid-liquid electrolyte lithium storage battery and preparation method thereof
  • Non-contact mixed solid-liquid electrolyte lithium storage battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] A method for preparing a non-contact mixed solid-liquid electrolyte lithium battery: comprising the following steps:

[0062] ①. Preparation of positive electrode structure:

[0063] a. Weigh LiCoO successively according to the weight ratio of 80:10:10 2 , carbon black and polyvinylidene fluoride, N-methylpyrrolidone was added and mixed uniformly to obtain a positive electrode active slurry with a solid content of 50% for forming the positive electrode active layer 111 .

[0064] b. Weigh LLTO, PEO and LiTFSI sequentially at a weight ratio of 5:5:10, add deionized water and mix evenly to obtain a positive electrode solid electrolyte slurry with a solid content of 60% for forming the positive electrode solid electrolyte layer 113 .

[0065] c. Take an 8 μm thick aluminum foil as the positive electrode current collector 112, wherein the area of ​​the through hole 13 on the aluminum foil accounts for 12% of the total area, and coat the positive electrode active slurry pre...

Embodiment 2

[0077]In this embodiment, on the basis of the method in Embodiment 1, the following adjustments are made:

[0078] Positive electrode active slurry: Weigh iron phosphate, carbon black and polyvinylidene fluoride sequentially in a weight ratio of 90:5:5, add N-methylpyrrolidone and mix evenly, with a solid content of 30%.

[0079] Positive electrode solid electrolyte slurry: weigh LAGP, PAA and LiClO sequentially in a weight ratio of 50:25:10 4 , adding N,N-dimethylformamide and mixing evenly, the solid content is 20%.

[0080] Negative electrode active slurry: Weigh the silicon carbon material, acetylene black and sodium carboxymethyl cellulose sequentially in a weight ratio of 80:15:5, add deionized water and mix evenly, and the solid content is 30%.

[0081] Negative electrode solid electrolyte slurry: Weigh LAGP, PAA and LiClO sequentially in a weight ratio of 40:5:20 4 , adding N,N-dimethylformamide and mixing evenly, the solid content is 40%.

[0082] The liquid electr...

Embodiment 3

[0084] In this embodiment, on the basis of the method in embodiment 1, the following adjustments are made:

[0085] Positive electrode active slurry: Weigh LiNi sequentially according to the weight ratio of 85:10:5 0.6 co 0.2 mn 0.2 o 2 , carbon black and polyvinylidene fluoride, adding N-methylpyrrolidone and mixing evenly, the solid content is 80%.

[0086] Positive electrode solid electrolyte slurry: weigh LAGP, PMMA and LiBF sequentially in a weight ratio of 85:30:50 4 , add tetrahydrofuran and mix well, the solid content is 10%.

[0087] Negative electrode active slurry: Weigh lithium titanate, acetylene black and sodium carboxymethyl cellulose sequentially in a weight ratio of 90:5:5, add deionized water and mix evenly, with a solid content of 80%.

[0088] Negative electrode solid electrolyte slurry: Weigh LAGP, PMMA and LiBF sequentially in a weight ratio of 85:30:50 4 , add tetrahydrofuran and mix well, the solid content is 10%.

[0089] The liquid electrolyte ...

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Abstract

The invention relates to the field of lithium storage batteries, and particularly discloses a non-contact mixed solid-liquid electrolyte lithium storage battery and a preparation method thereof. The lithium storage battery comprises a plurality of battery cell units which are sequentially overlapped, and each battery cell unit comprises a positive electrode structure and a negative electrode structure which are overlapped with each other, wherein the positive electrode structure is composed of a positive electrode current collector, and a positive electrode active layer and a positive electrode solid electrolyte layer which are arranged at two sides of the positive electrode current collector in a coated manner; the negative electrode structure consists of a negative electrode current collector, and a negative electrode active layer and a negative electrode solid electrolyte layer which are disposed at two sides of the negative electrode current collector in a coated manner, wherein the positive electrode solid electrolyte layer is attached to the negative electrode active layer, the negative electrode solid electrolyte layer is attached to the positive electrode active layer, anda plurality of through holes are formed in the positive electrode current collector and the negative electrode current collector. The positive current collector and the negative current collector designed by the invention have the functions of the current collector and a diaphragm, and are combined with the positive solid electrolyte layer, the negative solid electrolyte layer and the through holes, so that the safety performance and the battery performance of the lithium storage battery are effectively improved.

Description

technical field [0001] The invention relates to the field of lithium storage batteries, in particular to a non-contact mixed solid-liquid electrolyte lithium storage battery and a preparation method thereof. Background technique [0002] With the development of society, people's requirements for energy storage and green environmental protection have been greatly improved. Lithium-ion batteries, as a high-energy-density, green and environmentally friendly energy storage method, are more and more used in people's work and life. [0003] In existing lithium batteries, in order to maintain the power supply of the battery, a positive electrode sheet, a negative electrode sheet, and an electrolyte layer sandwiched between the positive electrode sheet and the negative electrode sheet are usually used as a unit assembly, which are stacked in sequence, and adjacent two A separator is arranged between the unit components to separate the positive and negative electrodes. [0004] Howe...

Claims

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Application Information

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IPC IPC(8): H01M4/80H01M10/052H01M10/056H01M10/0562H01M10/0566H01M10/058
CPCH01M10/052H01M10/056H01M4/80H01M10/0562H01M10/0566H01M10/058Y02E60/10Y02P70/50
Inventor 许晓雄丁超张赞赞张永龙
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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