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Preparation method of high-rate lithium ion battery

A lithium-ion battery, high-rate technology, which is used in the manufacture of electrolyte batteries, battery electrodes, battery pack components, etc. The effect of improving electronic conductivity and ion passing rate, preventing short circuit or micro-short circuit, improving rate performance and storage performance

Inactive Publication Date: 2017-08-22
湖北猛狮新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The emergence and application of carbon-coated aluminum foil as a positive electrode current collector has improved the rate performance of lithium-ion batteries to a certain extent, but it still cannot meet the requirements of market power equipment for battery rate performance.
During the production process, burrs are easy to be generated on the edge of the electrode sheet cutout. The battery self-discharges at the same time there is a risk of puncturing the diaphragm and causing a short circuit. The battery rate performance also increases the manufacturing cost
In the current process, high-rate batteries mostly use a separator with a high porosity of about 50%, which is very expensive

Method used

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  • Preparation method of high-rate lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Evenly mix 92% lithium cobalt oxide, 4% conductive carbon black SP-Li, and 4% polyvinylidene fluoride PVDF to make positive electrode dry powder, and then set the mass ratio as positive electrode dry powder: N-methylpyrrolidone = 1: The positive electrode dry powder of 1.0 is uniformly mixed with N-methylpyrrolidone to prepare a positive electrode slurry; use a coating machine to coat the positive electrode slurry on a carbon-coated aluminum foil, and dry to obtain a positive electrode sheet; then use the coating machine on the The front and back surfaces of the positive pole piece are coated with 2.0um conductive glue, and the positive pole piece is obtained by drying, rolling, and slitting. The mass ratio of conductive carbon black SP-Li and polyvinylidene fluoride PVDF in the conductive glue is It is conductive carbon black SP-Li: polyvinylidene fluoride PVDF=49:1, and the amount of solvent is 90% of the total weight of the conductive glue; use a spraying equipment to...

Embodiment 2

[0035]The mass percentage is 90% lithium iron phosphate, 5% carbon nanotube CNTS, and 5% polyvinylidene fluoride PVDF are evenly mixed to make positive electrode dry powder, and then the mass ratio is positive electrode dry powder: N-methylpyrrolidone=1: The positive electrode dry powder of 1.7 is uniformly mixed with N-methylpyrrolidone to prepare a positive electrode slurry; use a coating machine to coat the positive electrode slurry on a carbon-coated aluminum foil, and dry to obtain a positive electrode sheet; then use a coating machine to coat the positive electrode sheet Coating 3.0um conductive glue on the positive and negative surfaces of the conductive glue, drying, rolling, and slitting to obtain the positive electrode roll material. The mass ratio of conductive carbon black SP-Li and polyvinylidene fluoride PVDF in the conductive glue is conductive Carbon black SP-Li: polyvinylidene fluoride PVDF=32.3:1, the amount of solvent is 95% of the total weight of the conduct...

Embodiment 3

[0037] Evenly mix 95% lithium cobaltate, 3% graphene, and 2% polyvinylidene fluoride PVDF to make positive electrode dry powder, and then make the mass ratio lithium cobaltate:N-methylpyrrolidone=1: 1.5 Lithium cobaltate and N-methylpyrrolidone are uniformly mixed to prepare a positive electrode slurry; use a coating machine to coat the positive electrode slurry on carbon-coated aluminum foil, and dry to obtain a positive electrode sheet; then use a coating machine to coat the positive electrode sheet Coating 5.0um conductive glue on the positive and negative surfaces of the conductive glue, drying, rolling, and slitting to obtain the positive electrode roll material, the mass ratio of carbon nanotubes CNTS and polyvinylidene fluoride PVDF in the conductive glue is carbon nanotube CNTS: polyvinylidene fluoride PVDF=49:1, the amount of N-methylpyrrolidone is 92% of the total weight of the conductive glue; use a spraying equipment to coat a layer of ceramic coating on the cut end...

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Abstract

A preparation method of a high-rate lithium ion battery is used for manufacturing of lithium ion batteries and comprises the following steps: reeling prepared positive plate, negative plate and polyolefin diaphragm to form a battery cell, pre-packaging the battery cell with a shell, vacuum-drying, injecting an electrolyte, standing, forming, packaging and capacity-grading so as to obtain a lithium ion battery. By coating single and double surfaces of the positive plate with a conductive carbon layer, electronic conductivity and ion pass rate are enhanced, battery interlayer polarity is reduced, and then internal resistance of battery is reduced and high rate performance of batter are raised. By coating the edge cutting end of the plate with an anti-burr layer, short circuit or micro short circuit which might be caused by burr on the edge of the plate is prevented, self discharge rate is reduced, and safety performance of the battery is enhanced. By the use of the diaphragm with low porosity and under the precondition of guaranteeing high rate performance, self discharge rate and cost of the battery are reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a preparation method of a high-rate lithium-ion battery. Background technique [0002] Due to the advantages of high working voltage, high specific energy, long cycle life, low self-discharge rate, and no pollution, lithium-ion batteries have been widely used in small electronic devices such as mobile phones, portable computers, and digital products, and have been used in aircraft models, Vehicles such as unmanned aerial vehicles, automobile starting power supplies, electric vehicles and hybrid vehicles have shown broad application prospects and strong development momentum. [0003] At present, high-rate lithium-ion batteries have received widespread attention and applications. In order to improve the high-rate performance of lithium-ion batteries, it is generally achieved by adjusting the formula and surface density of the positive and negative electrodes, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/133H01M4/62H01M10/058H01M50/409
CPCH01M4/133H01M4/625H01M10/058H01M50/409Y02E60/10Y02P70/50
Inventor 贾克胜邱扬李青海
Owner 湖北猛狮新能源科技有限公司
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