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Power battery lithium ion secondary battery pole piece

A secondary battery and lithium-ion technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of battery rate performance, poor safety performance, poor manufacturability, etc., to improve manufacturability and safety, and improve cycle time Performance, the effect of reducing internal resistance

Inactive Publication Date: 2014-12-17
JIANGXI CHC BATTERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a pole piece of a power type lithium ion secondary battery, a pole piece formula with high rate performance, and improve the poor manufacturability, battery rate performance and safety performance of the power type lithium ion battery in the industry. question

Method used

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Embodiment Construction

[0008] The pole piece of the power type lithium ion secondary battery of the present invention will be further described in detail below.

[0009] The pole piece of the power type lithium ion secondary battery of the present invention is divided into a positive pole piece and a negative pole piece. 3.5%~5.5%, V7 (carbon nanotube) 1.0%~3.0%, VGCF (carbon nanofiber) 1.0%~3.0%, PVDF (polyvinylidene fluoride) 3.5%~5.5%, negative pole piece Composed of graphite 88.0%~90.0%, acetylene black (SP, particle size 40-45nm) 2.0%~4.0%, acetylene black B (SP, particle size 46-50nm) 2.0%~4.0%, oxalic acid (oxalic acid) 0.005% to 0.015%, PVDF (polyvinylidene fluoride) 3.5% to 5.5%.

[0010] The pole piece of the power type lithium ion secondary battery of the present invention is divided into a positive pole piece and a negative pole piece, and the configuration of the positive pole piece and the negative pole piece is a mass percentage. Do it, and then apply it on the positive electrode an...

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Abstract

The invention relates to a power battery lithium ion secondary battery pole piece which includes an anode pole piece and a cathode pole piece. The anode pole piece is manufactured from 88.0-94.0% of lithium iron phosphate, 3.5-5.5% of acetylene black (SP, with a particle size being 40-45 nm), 1.0-3.0% of V7 (carbon nano tubes), 1.0-3.0% of VGCF (carbon nano fibers), and 3.5-5.5% of PVDF (polyvinylidene fluoride). The cathode pole piece is manufactured from 88.0-90.0% of graphite, 2.0-4.0% of acetylene black (SP, with a particle size being 40-45 nm), 2.0-4.0% of acetylene black B (SP, with a particle size being 46-50 nm), 0.005-0.015% of oxalic acid (ethanedioic acid) and 3.5-5.5% of PVDF (polyvinylidene fluoride). According to selection of a material system and a formula optimizing experiment, a battery, which is excellent in manufacturing performance, high in circulating performance and high in rate performance, is developed.

Description

technical field [0001] The invention relates to a pole piece of a power type lithium ion secondary battery, which belongs to the field of lithium batteries. Background technique [0002] Power lithium-ion secondary batteries are widely used in electric bicycles, electric vehicles, power tools and other fields, and the demand is huge. At present, the secondary battery with lithium iron phosphate as the main cathode material has the best safety performance and rate performance, which is obviously better than cobalt Lithium oxide, lithium iron manganate and ternary material lithium batteries. At the same time, the elements required for lithium iron phosphate batteries are abundant in the earth, so they are quickly used as power batteries. At present, lithium iron phosphate is used as the positive electrode material in China. There are still relatively few researches, and the ratio of each component of the pole piece has not been optimized serially, and there are problems such a...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/133H01M4/62
CPCH01M4/133H01M4/136H01M4/62H01M4/623H01M4/625Y02E60/10
Inventor 龚明林斯辉李强
Owner JIANGXI CHC BATTERY
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