Rapid formation treatment method capable of improving cycle performance of lithium ion battery

A lithium-ion battery and cycle performance technology, applied in the field of lithium-ion batteries, can solve the problems of not being suitable for the lithium iron phosphate system, the uniformity and compactness of the SEI film, and the long formation time. Comprehensive treatment method, the effect of improving cycle performance

Inactive Publication Date: 2018-02-23
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the formation process, if a good SEI cannot be formed, more side reactions will occur in the subsequent cycle of the battery, resulting in a rapid decline in battery capacity and gas generation, which poses a great threat to consumers' lives and property
[0004] The patent name is a chemical formation treatment method for polymer soft-pack batteries (publication number: CN 104269584 A), which discloses a chemical formation treatment method for soft-pack batteries, but in the process of formation, constant current charging The cut-off voltage is 3.9-3.95V, which is not suitable for the lithium iron phosphate system; in addition, this method requires the battery squeezed by the fixture to wait for the temperature to drop to normal temperature after constant current charging. However, the actual situation is that the battery is difficult to dissipate heat in this state, cooling It is very slow to normal temperature and takes a long time to form
At the same time, the traditional chemical conversion treatment takes a long time, and the uniformity and compactness of the SEI film formed on the electrode interface is average, resulting in a short cycle life of the battery. Based on the above reasons, it is urgent to develop a short-time, high-efficiency Chemical conversion treatment of excellent SEI film

Method used

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  • Rapid formation treatment method capable of improving cycle performance of lithium ion battery
  • Rapid formation treatment method capable of improving cycle performance of lithium ion battery
  • Rapid formation treatment method capable of improving cycle performance of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Taking the cathode material of the battery as a ternary material as an example, the specific implementation steps are as follows:

[0027] 1) Put the injected lithium-ion battery on the high-pressure and high-temperature chemical conversion equipment. The battery surface pressure set by the equipment is 1.0MPa and the battery surface temperature is 60℃. Leave it for 10 minutes to ensure that the pressure and temperature of the battery surface are consistent with each other. The equipment set value is consistent;

[0028] 2) Formed constant current charging, using 0.1C current charging, charging time is 25min, charging protection cut-off voltage is 3.85V, after charging, put it aside for 3min;

[0029] 3) Formed constant current two charge, using 0.5C current charging, charging time is 115min, charging protection cut-off voltage is 3.85V, and left for 3min;

[0030] 4) The battery cell is placed in the cabinet and directly enters the second sealing process.

example 2

[0032] Example 2 is basically the same as Example 1, except that after the battery cell is placed in the cabinet, it does not directly enter the second sealing process. Instead, it is placed at a high temperature for 12 hours before entering the second sealing process.

example 3

[0034] Example 3 is the traditional chemical conversion processing method, the specific implementation steps are as follows:

[0035] 1) Cold-pressing and shaping the cells to be formed;

[0036] 2) Put the cold-pressed and reshaped battery cells in the cabinet on the chemical conversion equipment for a first charge, charging with 0.072C current, charging time 40min, charging protection cut-off voltage 4.1V, and leaving it for 3min;

[0037] 3) Formed second charge, charged with 0.05C current, charging time is 180min, charging protection cut-off voltage is 4.1V, and left for 3min;

[0038] 4) Formed triple charge, charged with 0.1C current, charging time is 120min, charging protection cut-off voltage is 4.1V, and left for 3min;

[0039] 5) Formed four-charge, 0.2C current charging, charging time is 60min, charging protection cut-off voltage is 4.1V, and left for 3min;

[0040] 6) Put the battery cell out of the cabinet and put it at high temperature for 12 hours before entering the secon...

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Abstract

The invention discloses a rapid formation treatment method capable of improving cycle performance of a lithium ion battery. The rapid formation treatment method comprises the following steps: carryingout secondary constant current charging or tertiary constant current charging on a to-be-formed main body surface of the lithium ion battery under extrusion and high temperature conditions, then directly entering a secondary sealing working procedure, wherein the extrusion condition is 1.0-1.5MPa, and the temperature condition is 45-65 DEG C. The rapid formation treatment method disclosed by theinvention has the advantages that different charging restrictions are adopted according to different lithium ion battery systems, formation time can be shortened to the utmost extent, and a uniform and compact SEI film is formed on an electrode interface, so that the cycle performance of the battery is effectively improved.

Description

Technical field [0001] The invention belongs to the field of lithium ion batteries, and specifically relates to a rapid formation treatment method for improving the cycle performance of lithium ion batteries. Background technique [0002] Since the end of the 19th century, as the human living environment has continued to deteriorate, people have gradually realized the importance of environmental protection, and countries around the world are vigorously developing "new energy" technologies. Lithium-ion batteries are widely used due to their advantages of high energy density, high voltage, low self-discharge, no memory effect, and long cycle life, for example: 3C consumer electronics, electric vehicles, energy storage and other industries. With the continuous depletion of oil and other traditional energy sources and the continuous pollution of automobile exhaust to the environment, pure electric vehicles (EV) and hybrid electric vehicles (HEV), as the future development trend of ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 刘昆刘学良徐海平王耐清陈小平李小兵胡泽林文一波
Owner 桑顿新能源科技(长沙)有限公司
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