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Preparation method of lithium iron phosphate lithium ion battery for large-capacity vehicle

A lithium-ion battery and lithium iron phosphate technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve problems such as water absorption, coating difficulties, and lithium iron phosphate processing difficulties, and achieve uniform temperature distribution and low cost. Low, safe effect

Active Publication Date: 2013-04-03
上海三玖电气设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lithium iron phosphate has the characteristics of high specific energy, long cycle life, stable structure, good safety performance, low cost, no toxic and harmful substances, and no pollution to the environment. It is the most promising development potential for the preparation of large-capacity and high-power power batteries positive electrode material, but the processing of lithium iron phosphate is difficult, and it is easy to absorb water during the preparation of the slurry, resulting in difficulty in coating

Method used

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  • Preparation method of lithium iron phosphate lithium ion battery for large-capacity vehicle
  • Preparation method of lithium iron phosphate lithium ion battery for large-capacity vehicle

Examples

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Effect test

Embodiment 1

[0046] (1) According to the weight percentage, put 86% conductive carbon powder, 0.5% conductive carbon black SP, 4% binder (SBR-CMC-LA132 system) and the rest of the solvent in the agitator, vacuumize fully Stir to make a slurry, and evenly coat the slurry on a 10 μm copper foil to obtain a battery negative electrode sheet;

[0047] The preparation process of the above slurry is specifically:

[0048] ① First bake the carbon powder, conductive carbon black SP and CMC in a vacuum oven;

[0049] ② Add CMC to the solvent, vacuumize and stir in the agitator at a speed of 2200 revolutions / min and 19 revolutions / min to obtain a uniform and transparent adhesive liquid system;

[0050] ③Add the LA132 emulsion to the above-mentioned bonding liquid system, and vacuumize and stir at the speed of rotation 1400 rpm and revolution 14 rpm to obtain a uniform and stable system;

[0051] ④Put conductive carbon black SP and carbon powder into the agitator successively, vacuumize and stir at ...

Embodiment 2

[0061] (1) According to weight percentage, put 93% conductive carbon powder, 2% conductive carbon black SP, 4% binder (SBR-CMC-LA132 system) and the rest of the solvent in the stirrer, vacuum fully Stir to make a slurry, and evenly coat the slurry on a 20 μm copper foil to obtain a battery negative electrode sheet;

[0062] The preparation process of the above slurry is specifically:

[0063] ① First bake the carbon powder, conductive carbon black SP and CMC in a vacuum oven;

[0064] ② Add CMC to the solvent, vacuumize and stir in the agitator at a speed of 2400 revolutions / min and 21 revolutions / min to obtain a uniform and transparent adhesive liquid system;

[0065] ③ Add the LA132 emulsion to the above-mentioned adhesive liquid system, vacuumize and stir at the speed of rotation 1600 rpm and revolution 16 rpm to obtain a uniform and stable system;

[0066] ④Put conductive carbon black SP and carbon powder into the agitator successively, vacuumize and stir at the speed of...

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Abstract

The invention relates to a preparation method of a lithium iron phosphate lithium ion battery for a large-capacity vehicle. The preparation method comprises the following steps of: (1) preparing a cathode pole piece of the battery; (2) manufacturing an electric core after drying, rolling, slitting, carrying out die-cutting on and carrying out lamination with an anode pole piece on the cathode pole piece; (3) mounting the dried electric core into a plastic shell, and packaging and carrying out leak detection, wherein a liquid injection hole is formed at the top end of the plastic shell, and a safe valve is mounted on the liquid injection hole; (4) vacuumizing the packaged and dried battery in a liquid injection manner, and placing; and (5) carrying out pre-charging, high-temperature aging and forming on the battery, so as to obtain a finished product battery. The preparation method provided by the invention has the advantages of simple process and low cost; the obtained lithium ion battery has the advantages of uniform temperature distribution, small battery inner resistance, no internal stress, good rate discharge, good battery security and the like; and the preparation method provided by the invention has good application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion batteries, in particular to a preparation method of lithium iron phosphate lithium ion batteries for large-capacity automobiles. Background technique [0002] Today, with the increasing shortage of oil resources and increasingly serious environmental pollution, the harmonious development of energy, resources, environment and human society has increasingly become the focus of social attention. It is seeking to develop alternative energy sources to traditional petrochemical energy, to realize the development of harmless resource industries, and to seek human harmony. Environmental harmony is particularly urgent. In modern society, people's demand for large-capacity and high-power batteries is becoming stronger and stronger, especially for power tools, electric bicycles, motorcycles, automobile power sources and backup power batteries. The currently used power batteries are mainly lead-acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/62
CPCY02E60/10Y02P70/50
Inventor 赖兴强帅鸿元
Owner 上海三玖电气设备有限公司
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