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Lithium ion battery structure and lithium supplementing method

A lithium-ion battery, lithium-ion technology, applied in secondary batteries, battery electrodes, structural parts, etc., can solve problems such as poor practicability, increased film volume for diaphragms, and increased impedance, achieving good compatibility and high efficiency. , to avoid the effect of heat accumulation

Pending Publication Date: 2020-07-24
ZHEJIANG ZHENENG TECHN RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the CN201610807837 patent proposes to add a separator between the positive and negative electrodes and then add metal lithium between the separators as the third electrode, but this method will cause an increase in the impedance between the positive and negative electrodes, and the increase in the amount of film used for the separator, so Not practical

Method used

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  • Lithium ion battery structure and lithium supplementing method
  • Lithium ion battery structure and lithium supplementing method
  • Lithium ion battery structure and lithium supplementing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The negative electrode sheet 5 in the present embodiment is to use Si / C as the negative electrode active material, dissolves in water according to the ratio of 96.2% negative electrode active material, 1.0% conductive carbon black, 1.0% CMC, 1.8% SBR (the ratio is based on the negative electrode sheet mass), prepared into a uniform and air-free slurry, and the front side of the negative pole piece 5 according to figure 1 The blank area 2 of the current collector is pre-coated on the copper foil current collector with a porosity of 0% to form the coating area 1 and the blank area 2 of the current collector. The length of the blank area 2 of the current collector is roll The length L1 of the outermost turn of the winding core after winding is equal to the width D1 of the negative pole piece 5 . Then, it is dried and rolled to prepare the negative electrode sheet 5 .

[0038] Lithium supplementation will be carried out according to 8% of the design capacity of the battery...

Embodiment 2

[0043] The negative electrode sheet 5 in the present embodiment is to use Si / C as the negative electrode active material, dissolves in water according to the ratio of 96.2% negative electrode active material, 1.0% conductive carbon black, 1.0% CMC, 1.8% SBR (the ratio is based on the negative electrode sheet mass), prepared into a uniform and air-free slurry, and the front side of the negative pole piece 5 according to figure 1 The blank area 2 of the current collector is pre-coated on the copper foil current collector with a porosity of 5% to form the coating area 1 and the blank area 2 of the current collector. The length of the blank area 2 of the current collector is The length L1 of the outermost turn of the winding core after winding is equal to the width D1 of the negative pole piece 5 . Then, it is dried and rolled to prepare the negative electrode sheet 5 .

[0044] Lithium supplementation will be carried out according to 15% of the designed capacity of the battery c...

Embodiment 3

[0049] The negative electrode sheet 5 in the present embodiment uses graphite as the negative electrode active material, which is dissolved in water according to the ratio of 96.2% negative electrode active material, 1.0% conductive carbon black, 1.0% CMC, and 1.8% SBR (the ratio is based on the quality of the negative electrode sheet) , prepared into a uniform and air-free slurry, the front of the negative pole piece 5 is according to figure 1 The blank area 2 of the current collector is pre-coated on the copper foil current collector with a porosity of 0% to form the coating area 1 and the blank area 2 of the current collector. The length of the blank area 2 of the current collector is roll The length L1 of the outermost turn of the winding core after winding is equal to the width D1 of the negative pole piece 5 . Then it is dried and rolled to prepare a negative electrode sheet.

[0050] Lithium supplementation will be carried out according to 8% of the designed capacity o...

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Abstract

The invention relates to a lithium ion battery structure. The lithium ion battery structure comprises a battery cell and an electrolyte rich in lithium ions, wherein the battery cell is formed by winding a diaphragm, a negative pole piece and a positive pole piece according to a sequence of the diaphragm, the negative pole piece, the diaphragm and the positive pole piece; the electrolyte rich in lithium ions is injected into the battery cell; and the negative pole piece consists of a current collector, a coating region coated with an active substance on the current collector, a current collector blank region which is not coated with the active substance and a tail lithium supplementing region. The lithium ion battery structure has beneficial effects that the coating area is arranged on thecurrent collector of the negative pole piece, the current collector blank region of the negative pole piece is combined with a lithium-containing material to form the tail lithium supplementing region, and lithium supplementing is realized through the electrolyte; heat accumulation caused by direct contact between a high-activity lithium source and a negative electrode is avoided; and meanwhile,the structure is good in compatibility with an existing lithium ion battery production process, high in efficiency, free of safety problems and suitable for industrial batch production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery structure and a method for replenishing lithium. Background technique [0002] In order to meet the needs of large-scale electric vehicle applications in the future, the next-generation lithium-ion battery technology needs to have higher energy density. The battery electrode material will lose a large amount of active lithium during the first cycle due to the film formation of the interphase solid electrolyte SEI. The irreversible loss of active lithium originating from the cathode material reduces the initial efficiency of Li-ion batteries and also permanently reduces the available energy of Li-ion batteries. Therefore, if the active lithium lost during the first charging process of the positive electrode material can be additionally compensated in the negative electrode material, the energy density of the lithium-ion battery can be greatly im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/13H01M4/139H01M10/0587H01M10/42
CPCH01M4/13H01M4/139H01M10/0525H01M10/0587H01M10/4242Y02E60/10Y02P70/50
Inventor 吴田马福元赵宇成城熊兴海
Owner ZHEJIANG ZHENENG TECHN RES INST
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