Method for producing lithium ion battery of high magnification

A lithium-ion battery, high-rate technology, applied in the manufacture of battery electrodes, non-aqueous electrolyte batteries, electrolyte batteries, etc., can solve the problem of adding pole piece production processes and time, introducing edge metal scraps into batteries, increasing production equipment and costs, etc. Problems, to achieve the effect of high rate charge and discharge performance, easy control and realization, and increase production efficiency

Inactive Publication Date: 2012-11-28
NINGBO SHIJIE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method not only increases the production equipment and cost, but also increases the production process and time of the pole piece.
In addition, the patent with the publication number CN1945878A discloses a method of needle punching or laser drilling (50% hole ratio, 100nm hole diameter) on the current collector to improve the rate performance, but this method may reduce the The resulting edge metal debris is introduced into the battery, causing a micro-short circuit
In the patent with the publication number CN1889293A, the improvement of the rate performance is mainly achieved by setting at least two tabs on the positive and negative plates. This method not only increases the consumption of metal foil on the one hand, but also increases the Pole piece production process

Method used

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  • Method for producing lithium ion battery of high magnification
  • Method for producing lithium ion battery of high magnification
  • Method for producing lithium ion battery of high magnification

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Using lithium iron phosphate as the positive electrode material and graphite as the negative electrode material to produce 80Ah plastic case lithium-ion batteries. Lithium iron phosphate is selected as the electrode sheet of the positive electrode material, and the surface density of double-sided coating is 35mg / cm 2 , with a compacted density of 2 g / cm 3 . After liquid injection, the bottom of the battery stands on the ground for 26 hours, then the front of the battery is placed on the ground for 2 hours, and then the left side, the right side, and the back are placed on the ground in the same way for 2 hours, and finally the bottom of the battery is placed on the ground for 2 hours. , the total standing time is 36h, and then carry out chemical composition test.

Embodiment 2

[0024] Using lithium iron phosphate as the positive electrode material and graphite as the negative electrode material to produce 80Ah plastic case lithium-ion batteries. Double-sided coating surface density 33 mg / cm 2 , compacted density 2.04 mg / cm 3 . After liquid injection, the bottom of the battery stands on the ground for 26 hours, then the front of the battery is placed on the ground for 2 hours, and then the left side, the right side, and the back are placed on the ground in the same way for 2 hours, and finally the bottom of the battery is placed on the ground for 2 hours. , the total standing time is 36h, the rate discharge performance data of the obtained battery is shown in the table below.

[0025] initial capacity 1C discharge 3C discharge 5C discharge 7C discharge 1C charging 3C charging Embodiment two 80.625Ah 81.129Ah 79.832Ah 79.812Ah 78.9Ah 78.916Ah 68.741Ah

Embodiment 3

[0031] Using lithium iron phosphate as the positive electrode material and graphite as the negative electrode material to produce 80Ah plastic case lithium-ion batteries. Lithium iron phosphate is selected as the electrode sheet of the positive electrode material, and the surface density of double-sided coating is 30mg / cm 2 , with a compacted density of 2.05 g / cm 3 . After liquid injection, the bottom of the battery stands on the ground for 20 hours, then the front of the battery is placed on the ground for 1 hour, and then the left side, the right side, and the back are placed on the ground in the same way for 1 hour, and finally the bottom of the battery is placed on the ground for 1 hour. .

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Abstract

Provided is a method for producing lithium ion batteries of high magnification. An electrode slice selected lithium iron phosphate as a cathode material has a double coating surface density of 30-36 mg / cm2 and a compaction density of 1.95-2.05 g / cm3; an electrode slice selected lithium manganate as the cathode material has a double coating surface density of 38-42 mg / cm2 and a compaction density of 2.65-2.75 g / cm3; an electrode slice selected a ternary material as the cathode material has a double coating surface density of 40-46 mg / cm2 and a compaction density of 3.45-3.55 g / cm3; and after the injection of a fluid, the battery is vertically stood for 12-36 h with a bottom surface touching the ground, the battery is stood for 1-5 h respectively with the front, the back, the left side, and the right side of the battery touching the ground, and at last the battery is vertically stood for 1-5 h again with the bottom surface touching the ground. By employing the method, large magnification charge and discharge performances of the lithium ion battery can be realized.

Description

technical field [0001] The invention relates to a method for producing a high rate lithium ion battery. Background technique [0002] As a new generation of secondary batteries, lithium-ion batteries have been widely used in low-rate discharge mobile phones and digital cameras due to their high monomer voltage, high energy and power density, long life, light weight, no memory effect, and no pollution. , notebook computers and other fields. As the application range of lithium-ion batteries becomes wider and wider, people's requirements for lithium-ion batteries are also getting higher and higher: lithium-ion batteries with high rate discharge performance will be used in hybrid vehicles, electric tools, aircraft model toys and military special fields. Has broad development prospects. [0003] In order to achieve high-rate charge and discharge of lithium-ion batteries, on the one hand, it is necessary to seek breakthroughs in battery materials (positive and negative active ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/139
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 张宏立李海望宗煜钦张永学
Owner NINGBO SHIJIE NEW ENERGY TECH
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