Maintenance method for capacity recovery type lithium ion battery

A lithium-ion battery, capacity recovery technology, applied in the direction of secondary battery repair/maintenance, etc., can solve the problems of insignificant capacity recovery effect, affecting lithium-ion de-intercalation reaction, etc., to achieve the effect of simple design and battery capacity recovery

Active Publication Date: 2013-07-03
常州孚达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the development and proliferation of the SEI film will affect the de-intercalation reaction of lithium ions on the electrode, so the capacity recovery effect is not obvious

Method used

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  • Maintenance method for capacity recovery type lithium ion battery
  • Maintenance method for capacity recovery type lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment one, heating method.

[0047] Commercial LiCoO 2 As the cathode active material, acetylene black is used as the conductive agent, PVDF is used as the binder, and according to LiCoO 2 : Acetylene black: PVDF=92:3:5 mass ratio, weigh and mix evenly, use NMP as dispersant, prepare slurry according to solid matter:NMP=60:40 mass ratio, stir evenly and spread on aluminum foil , after being dried at 80°C and rolled at 100MPa, it was cut into positive electrode sheets. Take commercial modified natural graphite as the anode active material, take acetylene black as the conductive agent, and styrene-butadiene latex as the binder, according to the mass ratio of graphite: acetylene black: styrene-butadiene latex = 92:3:5, weigh and mix evenly, Using deionized water as a dispersant, prepare a slurry according to the mass ratio of solid matter:NMP=60:40, stir evenly and spread it on a copper foil, dry it at 80°C, roll it at 80MPa, and cut it into negative electrode sheet...

Embodiment 2

[0050] Embodiment two, freezing method

[0051] Take Commercial LiMn 2 o 4 As the cathode active material, acetylene black was used as the conductive agent, PVDF was used as the binder, and other components and assembly methods of the battery were the same as in Example 1, except that 0.5% by mass of propylene carbonate was added as the SEI film-forming agent. Assembled into a battery with a capacity of 1Ah. The capacity dropped to 650mAh after 500 cycles at 2C rate. Discharge the battery to a voltage of 3.0V, open the valve and place the battery in a thermostat at minus 20°C for 24 hours, then put it at room temperature for 8 hours. Add LiPF at a concentration of 1mol / L 6 -EC / EMC / DEC (volume ratio 1:1:1) electrolyte, which contains 1% mass ratio of propylene carbonate as SEI film-forming agent, the amount of electrolyte added accounts for 1% of the battery shell except for electrodes, separators, and raw materials. 80% of the remaining space outside the electrolyte. Aft...

Embodiment 3

[0054] Embodiment three, ultrasonic method

[0055] Commercial LiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 As the cathode active material, acetylene black was used as the conductive agent, PVDF was used as the binder, and other components and assembly methods of the battery were the same as in Example 1, except that 0.5% by mass vinyl sulfite was added as the SEI film-forming agent. Assembled into a battery with a capacity of 1Ah. The capacity drops to 750mAh after 1000 cycles at 2C rate. Discharge the battery to a voltage of 3.0V, and place the battery in an ultrasonic container for 15 minutes after opening the valve. Add LiPF at a concentration of 1mol / L 6 -EC / EMC / DEC (volume ratio 1:1:1) electrolyte, which contains 5% by mass of vinyl sulfite as SEI film-forming agent, and the amount of electrolyte added accounts 80% of the remaining space outside the electrolyte. After leaving the battery for 8 hours, charge it to 4.3V with a constant current of 200mA, discharge it at a constant cu...

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Abstract

The invention provides a maintenance method for a capacity recovery type lithium ion battery, and aims to overcome the defect that the capacity of the current lithium ion battery can not be effectively recovered. The method comprises the following steps: (1), damaging an SEI film; (2), adding an SEI film restoration agent; and (3), forming and sealing. The method has the benefits that through simple design, the formed SEI film can be regenerated after being damaged, so that the service life of the lithium ion battery is prolonged to 3000-5000 times from 1000 times, and accordingly the purpose of repeated regeneration is achieved and the capacity of the battery is effectively recovered during the regeneration process.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and in particular relates to a maintenance method for a capacity recovery type maintainable lithium ion battery. Background technique [0002] Lead-acid battery is an important secondary chemical power source, and its technical development has undergone a transformation process from maintainable to maintenance-free. Lithium-ion batteries are currently one of the most promising secondary chemical power sources. Unlike lead-acid batteries, lithium-ion batteries have adopted a maintenance-free design concept since their birth because of their long service life. At present, the service life of lithium-ion batteries is generally more than 1000 times, the single working voltage exceeds 3.0V, and the capacity is high and the environment is friendly. business success. Under the background of dual pressures on the environment and energy, the application of lithium-ion batteries in important fields...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42
CPCY02E60/10
Inventor 张汉平杜青孙晓辉李成钢
Owner 常州孚达新能源科技有限公司
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