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Method for manufacturing positive plate of lithium iron phosphate battery

A technology of lithium iron phosphate and positive electrode sheet, which is applied in the field of manufacturing positive electrode sheet of lithium iron phosphate battery, which can solve the problems of difficult coating of electrode sheet and material drop of battery cell, etc., so as to improve production efficiency, reduce material drop problem, improve The effect of compaction density

Active Publication Date: 2013-03-27
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned problems in the prior art, such as the difficulty in coating the pole piece, and the occurrence of material drop in the prepared cell or battery, the purpose of the present invention is to provide a method that can improve the coating performance of lithium iron phosphate materials, increase the compaction density, and thereby Method for manufacturing positive electrode sheet of lithium iron phosphate battery for improving electrochemical performance of battery

Method used

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  • Method for manufacturing positive plate of lithium iron phosphate battery
  • Method for manufacturing positive plate of lithium iron phosphate battery
  • Method for manufacturing positive plate of lithium iron phosphate battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Two kinds of lithium iron phosphate positive electrode materials with lithium iron phosphate contents of 92% and 95% were proportioned in a weight ratio of 1:2, and a total of 700 g were mixed in a planetary ball mill for 3 hours to obtain a pretreatment material, and then 33 gram of sp (that is, carbon black) conductive agent, continue to mix in a vacuum mixer (atmospheric pressure at -0.1mpa) for 2 hours, add 1000g of pre-mixed binder 1013 slurry with a viscosity within 10000mPa·s to the obtained mixture, Continue mixing in a vacuum mixer (atmospheric pressure at -0.1mpa) for 6 hours to obtain a lithium iron phosphate cathode material slurry. The obtained lithium iron phosphate positive electrode material slurry is made into a surface density of 110g / m after the coating process 2 The positive electrode sheet is then pressed with a double-roller press and made into a battery through a post-battery manufacturing process.

[0024] The battery that present embodiment obt...

Embodiment 2

[0026] Three kinds of lithium iron phosphate positive electrode materials with lithium iron phosphate contents of 92%, 95% and 97% were proportioned in a weight ratio of 1:5:1, and a total of 700g were mixed in a ball mill for 3 hours to obtain a pretreated material. Then add 33 grams of sp (that is, carbon black) conductive agent, continue mixing in a vacuum mixer (atmospheric pressure at -0.1mpa) for 2 hours, and add 1000g of pre-mixed binder 1013 with a viscosity within 10000mPa·s to the obtained mixture The slurry was continuously mixed for 6 hours in a vacuum mixer (atmospheric pressure at -0.1mpa) to obtain a lithium iron phosphate cathode material slurry. The obtained lithium iron phosphate positive electrode material slurry is made into a surface density of 110g / m after the coating process 2 The positive electrode sheet is then pressed with a double-roller press and made into a battery through a post-battery manufacturing process.

[0027] The battery that present emb...

Embodiment 3

[0029] Three kinds of lithium iron phosphate positive electrode materials with lithium iron phosphate contents of 92%, 95% and 98% were mixed according to the weight ratio of 1:4:1, and a total of 700g were mixed in a vibrating mill for 3 hours to obtain pretreatment material, then add 33 grams of sp (that is, carbon black) conductive agent, continue mixing in a vacuum mixer (atmospheric pressure at -0.1mpa) for 2 hours, and add 1000g of pre-mixed bonding agent with a viscosity within 10000mPa·s to the obtained mixture Agent 1013 slurry was mixed for 6 hours in a vacuum mixer (atmospheric pressure at -0.1mpa) to obtain lithium iron phosphate cathode material slurry. The obtained lithium iron phosphate positive electrode material slurry is made into a surface density of 110g / m after the coating process 2 The positive electrode sheet is then pressed with a double-roller press and made into a battery through a post-battery manufacturing process.

[0030] The battery that present...

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Abstract

The invention relates to the field of lithium ion batteries, and discloses a method for manufacturing a positive plate of a lithium iron phosphate battery, which comprises a slurry preparation process and a coating process, wherein lithium iron phosphate positive materials adopted in the slurry preparation process are preprocessed by the following method: more than two types of lithium iron phosphate positive materials with different lithium iron phosphate main component contents are uniformly mixed for 2 to 10 hours in a mode of ball milling, superfine grinding, planet ball milling, sanding or vibrational milling. The method effectively solves the common problems that the plate is difficult to coat, the prepared battery cell or battery loses materials and the like in the prior art, and can improve lithium iron phosphate material coating performance and improve compacted density so as to improve the electrochemical performance of the battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for manufacturing positive plates of lithium iron phosphate batteries. Background technique [0002] LiFePO 4 The cathode material is a new type of cathode material for lithium-ion batteries. LiFePO 4 It has high energy density, low price, and excellent safety, making it especially suitable for power batteries. Its appearance is a major breakthrough in lithium-ion battery materials, but lithium iron phosphate batteries are still in a state of continuous batch stability due to their raw material active materials, poor ion and electronic conductivity, resulting in poor charge-discharge rate performance Good, which has greatly affected the current promotion of lithium iron phosphate batteries. [0003] With the introduction and widespread popularization of low-carbon models, the requirements for new energy sources are becoming increasingly urgent and necessary. As ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 徐君周晓栋任纡青
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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