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High-security long-life ternary material battery

A material battery and ternary material technology, applied in the direction of batteries, battery electrodes, secondary batteries, etc., can solve problems such as poor cycle life and low safety, and achieve high tap density, high capacity retention rate, and moderate specific surface area Effect

Active Publication Date: 2017-01-11
湖南锂顺能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, solve the problems of low safety and poor cycle life of the existing ternary material batteries, and provide a high-safety long-life ternary material battery

Method used

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  • High-security long-life ternary material battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Positive electrode slurry:

[0025] Ternary material LiNi 0.5 co 0.2 mn 0.3 o 2 : polyvinylidene fluoride: oily carbon nanofiber = 94.0%: 4.5%: 1.5%. Add polyvinylidene fluoride according to the metering ratio, prepare polyvinylidene fluoride and positive electrode slurry solvent N-methylpyrrolidone according to the metering ratio, first add N-methylpyrrolidone and then polyvinylidene fluoride, so that the concentration of polyvinylidene fluoride is 4.0 wt%; revolution 35rpm, rotation 200rpm stirring 10min after scraping, normal stirring, revolution 35rpm, rotation 2200rpm vacuum stirring 4h; add oily carbon nanofibers according to the metering ratio, revolution 55rpm, rotation 600rpm stirring 20min after scraping, revolution 65rpm, rotation 2600rpm, vacuum stirring for 2h; add ternary material LiNi according to the metering ratio 0.5 co 0.2 mn 0.3 o 2 , revolution at 45rpm, rotation at 2300rpm and stirring for 15min, then normal stirring after scraping, revolut...

Embodiment 2

[0034] Positive electrode slurry:

[0035] Ternary material LiNi 0.4 co 0.2 mn 0.4 O2: polyvinylidene fluoride: oily carbon nanofiber = 95.0%: 3.3%: 1.7%. Prepare polyvinylidene fluoride and positive electrode slurry solvent N-methylpyrrolidone according to the metering ratio, first add N-methylpyrrolidone and then polyvinylidene fluoride, so that the concentration of polyvinylidene fluoride is 4.0wt%; revolution 35rpm, rotation 200rpm stirring After 10 minutes of scraping, carry out normal stirring, revolution 35rpm, rotation 2200rpm vacuum stirring for 4h; according to the metering ratio, add oily carbon nanofibers, revolution 55rpm, rotation 600rpm and stir for 20min, revolution 65rpm, rotation 2600rpm, vacuum stirring 2h; according to metering ratio Add ternary material LiNi 0.5 co 0.2 mn 0.3 o 2 , revolution at 45rpm, rotation at 2300rpm and stirring for 15min, then normal stirring after scraping, revolution at 65rpm, rotation at 2700rpm and stirring for 150min. A...

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Abstract

The invention relates to a high-security long-life ternary material battery. Cathode size comprises the following solid matters by mass percent: 92.0-95.5% of ternary material, 3.0-7.0% of polyvinylidene fluoride and 1.5-2.5% of oily carbon nanofibers, and anode size comprises the following solid matters by mass percent: 90.0-93.5% of lithium titanate, 1.0-2.4% of sodium carboxymethylcellulose, 3.5-7.0% of a binding agent, 0.3-1.0% of SP type conductive carbon black, 0.5-1.8% of C45 type conductive carbon black and 1.2-2.4% of KS-6 type conductive carbon black. The high-security long-life ternary material battery provided by the invention is qualified in security, under room temperature condition, continuous charging and discharging is carried out according to 1C charge-discharge system, capacity retention ratio after 2000 cycles is higher than 80%, and operating requirements of a small electric tool, aviation, spaceflight and new energy automobiles can be met.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a high-safety long-life ternary material battery. Background technique [0002] High-efficiency secondary batteries are designed and developed for "providing energy for mobile users" and "storing electricity". For mobile user energy storage, batteries are required to have long life, high safety and differentiated performance. Compared with other types of secondary batteries, lithium-ion batteries have outstanding advantages such as higher specific energy, higher specific power, higher voltage, small self-discharge, no memory effect, and environmental protection, and have become the most ideal battery. system. [0003] Under the national energy strategic layout, the new energy industry has developed rapidly under the stimulation of favorable policies. At present, the mainstream systems of lithium-ion batteries are divided into lithium iron phosphate and ternary mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0567H01M10/42H01M4/62
CPCH01M4/485H01M4/505H01M4/525H01M4/625H01M10/0567H01M10/4235H01M2220/20Y02E60/10
Inventor 何鹏飞沈智郑拥军陈建华
Owner 湖南锂顺能源科技有限公司
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