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Rate cycling improved lithium iron phosphate battery and preparation method thereof

A lithium iron phosphate battery and rate technology, applied in the direction of batteries, battery electrodes, battery pack components, etc., can solve the problems of low specific capacity, poor cycle performance, poor safety performance, etc., to improve adhesion, prevent internal Short circuit, the effect of reducing internal resistance

Inactive Publication Date: 2015-04-29
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestically produced nickel-cobalt lithium manganese oxide batteries have problems such as poor cycle performance and slightly poor safety performance. Lithium manganese oxide batteries have problems with low specific capacity, while lithium iron phosphate has high specific capacity, long cycle life, and environmental protection. , safety and reliability and many other advantages are favored by domestic industry professionals

Method used

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  • Rate cycling improved lithium iron phosphate battery and preparation method thereof
  • Rate cycling improved lithium iron phosphate battery and preparation method thereof
  • Rate cycling improved lithium iron phosphate battery and preparation method thereof

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preparation example Construction

[0032] A method for preparing a rate cycle-improved lithium iron phosphate battery, characterized in that: the positive electrode is prepared: LiFePO 4: Super-P:KS-6:CNTs:PVDF:NMP=87:2:3:3:5:144. Dissolve PVDF in NMP first, stir for 3 hours, then mix the lithium iron phosphate material and the conductive agent, and use a dry powder mixer to disperse and stir evenly. The stirring speed is 24r / min, and the stirring time is 120min. Then add the mixed materials into the glue solution, stir at high speed for 4 hours to disperse, the low speed revolution speed is 20r / min, the high speed dispersion speed is 2200r / min, and the vacuum degree is -0.09MPa. The stirred slurry is sieved and coated on aluminum foil after vacuum defoaming, and then dried, rolled, and cut to obtain positive electrode sheets. The material of the tab is aluminum strip, the width is 6 mm, and the number of tabs is 3;

[0033] Preparation of negative electrode: CAG-3:Super-P:VGCF:CMC:SBR:H 2 O=91.5:2:2:1.7:2.8:...

Embodiment 1

[0040] The present invention is described below by taking the preparation process of a 26650-2300mAh-3.3V high-rate battery as an example. The positive electrode material used in the battery is as follows: figure 1 As shown, the specific preparation method of the battery is as follows:

[0041] Preparation of positive electrode: LiFePO 4: Super-P:KS-6:CNTS:PVDF:NMP=87:2:3:3:5:144. Dissolve PVDF in NMP first, stir for 3 hours, then mix the lithium iron phosphate material and the conductive agent, and use a dry powder mixer to disperse and stir evenly. The stirring speed is 24r / min, and the stirring time is 120min. Then add the mixed materials into the glue solution, stir at high speed for 4 hours to disperse, the low speed revolution speed is 20r / min, the high speed dispersion speed is 2200r / min, and the vacuum degree is -0.09MPa. The stirred slurry is sieved and coated on carbon-coated aluminum foil after vacuum defoaming, and then dried, rolled, and cut to make positive ele...

Embodiment 2

[0045] Preparation of positive electrode: LiFePO 4: Super-P:KS-6:CNTS:PVDF:NMP=87:2:3:3:5:144. Dissolve PVDF in NMP first, stir for 3 hours, then mix the lithium iron phosphate material and the conductive agent, and use a dry powder mixer to disperse and stir evenly. The stirring speed is 24r / min, and the stirring time is 120min. then mix well

[0046] Add the materials into the glue solution, stir at high speed for 4 hours to disperse, the low speed revolution speed is 20r / min, the high speed dispersion speed is 2200r / min, and the vacuum degree is -0.09MPa. The stirred slurry is sieved and coated on aluminum foil after vacuum defoaming, and then dried, rolled, and cut to make positive electrode sheets. The material of the tabs is aluminum strip, the width is 6mm, and the number of tabs is 3. The shape of the pole piece is as figure 2 shown.

[0047] Preparation of negative electrode: CAG-3:Super-P:CNTC:CMC:SBR:H 2 O=91.5:2:2:1.7:2.8:133. Dissolve CMC in water first, st...

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Abstract

The invention discloses a rate cycling improved lithium iron phosphate battery and a preparation method thereof. The preparation method mainly comprises the selection of current collectors, a diaphragm material and electrolyte. A carbon-coated aluminum foil and a carbon-coated copper foil are adopted for the positive and negative current collectors, so that contact internal resistance between cathode and anode materials and the current collectors can be greatly reduced, the adhesive force between the cathode and anode materials and the current collectors can be improved, and the rate discharge performance of the materials can be effectively improved. A ceramic diaphragm is adopted, so that short-circuit in the battery can be effectively prevented, and the safety performance of the battery can be improved. Rate type electrolyte is selected, so that the anode material is favorably prevented from being expanded, and the cycling performance of the battery is improved. The lithium iron phosphate battery has high rate cycling performance and reliable safety performance, and can be used as a power supply for transportation.

Description

Technical field [0001] The invention involves a lithium ion battery, especially a multiplier cycle to improve the lithium iron phosphate battery and its preparation methods. Background technique [0002] With the implementation of China's new energy vehicle policy, the research boom of power lithium -ion batteries has increased.At present, the dynamic lithium ion battery market is mainly nickel cobalt manganate batteries, lithium manganate batteries, and lithium iron phosphate batteries.There are problems such as poor circulation performance and poor safety performance in the domestic nickel cobalt manganate battery. There is a problem with low capacity than the capacity of lithium manganate batteries, and lithium iron phosphate has higher capacity, long cycle life, green and environmentally friendly due to the capacity, long cycle life, green environmental protectionMany advantages such as security and reliability are favored by people in the domestic industry.However, as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/66H01M50/403H01M50/434
CPCH01M4/664H01M2220/20H01M50/431Y02E60/10
Inventor 关成善宗继月李涛刘艳辉
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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