High rate ternary system starting and stopping lithium ion battery and preparation method thereof

A lithium-ion battery and ternary system technology, applied in the field of lithium-ion batteries, can solve the problems of no significant improvement in high-rate charging performance, no significant increase in conductivity, and restrictions on the use of high-rate requirements, and meet instantaneous high power requirements. Effects of output and input requirements, shorter embedding and embedding distances, and improved film thickness and density

Inactive Publication Date: 2018-09-07
SHENZHEN HAIYING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of lithium iron phosphate is relatively low, which directly restricts its high-magnification requirements. + The transmission path to improve the high rate performance of the battery, and for LiFePO 4 The conductivity itself has not been significantly improved, and the final improvement after the battery is made is often the high-rate discharge performance of the lithium iron phosphate battery, while its high-rate charge performance has not been significantly improved.

Method used

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  • High rate ternary system starting and stopping lithium ion battery and preparation method thereof
  • High rate ternary system starting and stopping lithium ion battery and preparation method thereof
  • High rate ternary system starting and stopping lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1) Prepare 90wt% LiNi in proportion 1 / 3 co 1 / 3 mn 1 / 3 o 2 (positive active material), 6.3wt% of conductive carbon black and carbon nanotube mixture (positive electrode conductive agent), 3.5wt% of polyvinylidene fluoride (positive electrode binder) and 0.2wt% of polyvinylpyrrolidone (dispersant ), then the mixture of conductive carbon black and carbon nanotubes and polyvinylpyrrolidone are dissolved in N-methylpyrrolidone solvent, high-speed dispersion is made into a positive electrode conductive emulsion with a solid content of 5%, and then LiNi is added to the positive electrode conductive emulsion 1 / 3 co 1 / 3 mn 1 / 3 o 2 Disperse with polyvinylidene fluoride at a high speed to form a positive electrode mixture, evenly coat the positive electrode mixture on carbon-coated aluminum foil, and form a positive electrode sheet after drying and rolling. The coating surface density of the positive electrode mixture is 0.96-1.60g / dm 2 ;

[0030] 2) Prepare 90wt% artificia...

Embodiment 2

[0033] 1) Prepare 92wt% LiNi in proportion 0.5 co 0.2 mn 0.3 o 2 (positive active material), 5.3wt% conductive carbon black and Ketjen black mixture (positive electrode conductive agent), 2.5wt% polyvinylidene fluoride (positive electrode binder) and 0.2wt% polyvinylpyrrolidone (dispersant ), then the mixture of conductive carbon black and ketjen black and polyvinylpyrrolidone are dissolved in N-methylpyrrolidone solvent, high-speed dispersion is made into a positive electrode conductive emulsion with a solid content of 4%, and then LiNi is added to the positive electrode conductive emulsion 0.5 co 0.2 mn 0.3 o 2 Disperse with polyvinylidene fluoride at a high speed to form a positive electrode mixture, uniformly coat the positive electrode mixture on carbon-coated aluminum foil, and form a positive electrode sheet after drying and rolling. The coating surface density of the positive electrode mixture is 0.96-1.60g / dm 2 ;

[0034] 2) Prepare 92wt% artificial graphite (n...

Embodiment 3

[0037] 1) Prepare 94wt% LiNi in proportion 1 / 3 co 1 / 3 mn 1 / 3 o 2 and LiNi 0.5 co 0.2 mn 0.3 o 2 mixture (positive electrode active material), 3.8wt% Ketjen black and carbon nanotube mixture (positive electrode conductive agent), 2wt% polyvinylidene fluoride (positive electrode binder) and 0.2wt% polyvinylpyrrolidone (dispersion agent), then dissolve the mixture of Ketjen black and carbon nanotubes and polyvinylpyrrolidone in N-methylpyrrolidone solvent, and disperse at a high speed to make a positive electrode conductive emulsion with a solid content of 6%, and then add LiNi to the positive electrode conductive emulsion 1 / 3 co 1 / 3 mn 1 / 3 o 2 and LiNi 0.5 co 0.2 mn 0.3 o 2 The mixture and polyvinylidene fluoride are dispersed at high speed to form a positive electrode mixture. The positive electrode mixture is evenly coated on the carbon-coated aluminum foil, and the positive electrode sheet is formed after drying and rolling. The coating surface density of the pos...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and relates to a high rate ternary system starting and stopping lithium ion battery, comprising a positive plate, a negative plate, a diaphragm, electrolyte and an aluminum-plastic film, wherein the positive plate comprises a positive current collector and a positive mixture layer, wherein the positive current collector is coated with the positive mixture layer; the negative plate comprises a negative current collector and a negative mixture layer, wherein the negative current collector is coated with the negative mixture layer; the coating surface density of the positive mixture layer is 0.96-1.60g/dm<2>, and the coating surface density of the positive mixture layer is 0.5-0.8g/dm<2>. In addition, the invention also provides a preparation method of the high rate ternary system starting and stopping lithium ion battery. Compared with the prior art, the high rate ternary system starting and stopping lithium ion battery has higher-rate charge-discharge property, thus meeting the instantaneous high power output and input requirements of the starting and stopping for the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-rate ternary system start-stop lithium-ion battery and a preparation method thereof. Background technique [0002] With the stringent requirements of fuel consumption targets, domestic mainstream car companies continue to increase the application of start-stop batteries, and my country's car start-stop power supply market is also showing a rapid growth trend with the increase in car sales. At the same time, with the maturity of lithium-ion battery technology and the decline in battery prices in recent years, the application of lithium-ion batteries in the field of start-stop batteries has gradually accelerated. Therefore, higher requirements are put forward for the charging performance of lithium-ion batteries. High-rate instantaneous charging Ability needs to make a breakthrough. [0003] At present, the material system used in lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 黄启祥陶芝勇胡清平刁胜黄泽伟曾坚义
Owner SHENZHEN HAIYING TECH
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