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A non-contact mixed solid-liquid electrolyte lithium battery and its preparation method

A non-contact, lithium battery technology, applied in non-aqueous electrolyte batteries, lithium batteries, battery electrodes, etc., can solve the problems of piercing the diaphragm, reducing lithium ion content, short circuit, etc., to improve production efficiency, simple operation, convenient The effect of mass production

Active Publication Date: 2021-05-07
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, during the charging process of a lithium battery, lithium ions will be reduced to form dendritic lithium crystal branches, which will reduce the lithium ion content in the lithium battery, and as the number of lithium ions charged increases, the lithium crystal dendrites will continue to grow and pierce the diaphragm or The solid electrolyte layer causes the positive and negative electrodes to be connected to each other and a short circuit occurs

Method used

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  • A non-contact mixed solid-liquid electrolyte lithium battery and its preparation method
  • A non-contact mixed solid-liquid electrolyte lithium battery and its preparation method
  • A non-contact mixed solid-liquid electrolyte lithium battery and its preparation method

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Embodiment 1

[0071]A method for preparing a non-contact mixed solid-liquid electrolyte lithium battery: comprising the following steps:

[0072] ①. Preparation of positive electrode structure 11:

[0073] 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%.

[0074] b. Weigh LLTO, PEO and LiTFSI sequentially in a weight ratio of 20:5:10, add deionized water and mix evenly to obtain anode buffer slurry with a solid content of 60%.

[0075] c. Weigh LLTO, PEO and LiTFSI sequentially in 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%.

[0076] d. 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...

Embodiment 2

[0089] In this embodiment, on the basis of the method in embodiment 1, the following adjustments are made:

[0090] 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, and the solid content is 30%.

[0091] Positive electrode buffer slurry: Weigh LAGP, PPC and LiClO sequentially in a weight ratio of 1:1:5 4 , adding N,N-dimethylformamide and mixing evenly, the solid content is 20%.

[0092] 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%.

[0093] 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%.

[0094] Negative electrode buffer sl...

Embodiment 3

[0098] In this embodiment, on the basis of the method in embodiment 1, the following adjustments are made:

[0099] 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%.

[0100] Positive electrode buffer slurry: weigh LAGP, polysiloxane and LiBF sequentially in a weight ratio of 40:1:5 4 , adding N,N-dimethylformamide and mixing evenly, the solid content is 60%.

[0101] 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%.

[0102] 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, and the solid content is 80%.

[0103] Negative elec...

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Abstract

The invention discloses the field of lithium storage batteries, in particular to a non-contact mixed solid-liquid electrolyte lithium storage battery and a preparation method thereof. structure; the positive electrode structure is composed of a positive electrode active layer, a positive electrode current collector, a positive electrode buffer gel layer and a positive electrode solid electrolyte layer, and the negative electrode structure is composed of a negative electrode active layer, a negative electrode current collector, a negative electrode buffer gel layer and a negative electrode solid electrolyte layer. Both the positive electrode current collector and the negative electrode current collector are provided with a plurality of through holes, and both the positive electrode buffer gel layer and the negative electrode buffer gel layer contain lithium salt. The lithium storage battery of the present invention is obtained by sequentially preparing the positive electrode structure, the negative electrode structure, and the cell unit, which ensures the transfer of lithium ions between the positive electrode structure and the negative electrode structure, and effectively reduces the interconnection between the positive electrode active layer and the negative electrode active layer. Possibility, both excellent electric cycle performance and safety performance.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M4/66H01M10/0562H01M4/485H01M10/0585
CPCH01M4/485H01M4/667H01M10/052H01M10/0562H01M10/0585Y02E60/10Y02P70/50
Inventor 许晓雄丁超张永龙
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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