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A low-temperature high-energy-density lithium iron phosphate battery

A lithium iron phosphate battery, high energy density technology, applied in the direction of battery electrodes, secondary batteries, battery components, etc., can solve the problems of low energy density of lithium iron phosphate batteries, poor low-temperature discharge performance, etc., to achieve good low-temperature discharge The effect of high performance, high liquid retention, and high gram capacity

Active Publication Date: 2019-11-15
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 energy density and poor low-temperature discharge performance of existing lithium iron phosphate batteries, and provide a low-temperature high-temperature battery with high energy density and good low-temperature discharge performance. Energy density lithium iron phosphate battery

Method used

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  • A low-temperature high-energy-density lithium iron phosphate battery
  • A low-temperature high-energy-density lithium iron phosphate battery
  • A low-temperature high-energy-density lithium iron phosphate battery

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Positive electrode slurry:

[0023] The graphene oxide-coated coated nanoscale lithium iron phosphate: polyvinylidene fluoride: oily carbon nanotubes are respectively = 95.0%: 4.0%: 1.0% by mass. 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 6.0wt%; revolution 45rpm, rotation 300rpm stirring After 15 minutes of scraping, carry out normal stirring, revolution 30rpm, rotation 2300rpm vacuum stirring for 3h; add oily carbon nanotubes according to the metering ratio, revolution 45rpm, rotation 500rpm and stir for 15min after scraping, revolution 55rpm, rotation 2800rpm, vacuum stirring for 2h; Then add coated nanoscale lithium iron phosphate coated with graphene oxide, rotate at 55rpm, rotate at 2200rpm and stir for 10min. After scraping, perform normal stirring, revolve at 55rpm ...

Embodiment 2

[0033] Positive electrode slurry in the present embodiment:

[0034]Graphene-coated coated nanoscale lithium iron phosphate: polyvinylidene fluoride: oily carbon nanotubes = 94.0%: 4.5%: 1.5%. Prepare polyvinylidene fluoride and the solvent N-methylpyrrolidone used in the slurry according to the metering ratio, first add N-methylpyrrolidone and then polyvinylidene fluoride, so that the mass concentration of polyvinylidene fluoride is 7.0%, revolution 45rpm, rotation Stir at 300rpm for 15 minutes and scrape the material, then carry out normal stirring, revolution at 30rpm, rotation at 2300rpm and vacuum stirring for 3h; add oily carbon nanotubes according to the metering ratio, revolution at 45rpm, rotation at 500rpm and stir for 15min after scraping, revolution at 55rpm, rotation at 2800rpm, vacuum stirring for 2h; Add graphene-coated coated nano-scale lithium iron phosphate according to the metering ratio, rotate at 55 rpm, rotate at 2200 rpm, stir for 10 minutes, then scrape...

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Abstract

A low-temperature high-energy-density lithium iron phosphate battery, the mass percentage of each solid substance in the positive electrode is: coated nano-scale lithium iron phosphate: 93.0% to 95.5%; polyvinylidene fluoride: 3.5% to 7.3%; oily carbon nanotubes : 1.0% to 2.0%; the mass percentage of each solid substance in the negative electrode is: porous silicon carbon: 90.0% to 93.5%; sodium carboxymethyl cellulose: 1.5% to 3.0%; binder: 3.0% to 6.0%; SP type Conductive carbon black: 0.5% to 1.2%; C 45 Type conductive carbon black: 0.5% to 1.5%; KS‑6 type conductive graphite: 1.0% to 2.0%. The high-energy-density lithium iron phosphate battery provided by the present invention has good low-temperature discharge performance, and the discharge capacity at -40°C is more than 75% of the room temperature discharge capacity, which can meet the use of small electric tools, aviation, aerospace and new energy vehicles in cold regions Require.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a low-temperature lithium iron phosphate battery with high energy density. Background technique [0002] Compared with other rechargeable batteries, lithium-ion batteries have the advantages of high voltage, high specific energy, long cycle life, no memory effect, less environmental pollution, and low self-discharge rate. As an important chemical power source, they are widely used in mobile phones and notebooks. Computers, digital cameras, portable small electrical appliances and other fields are widely used, and gradually move towards the fields of aviation, aerospace and electric vehicles. [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 materials. The battery ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M2/16H01M4/58H01M4/62H01M10/0567H01M50/409
CPCH01M4/5825H01M4/625H01M10/0525H01M10/0567H01M50/409Y02E60/10
Inventor 何鹏飞沈智郑拥军肖毅
Owner 湖南锂顺能源科技有限公司
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