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A method for recovering lithium-sulfur battery capacity

A lithium-sulfur battery and capacity restoration technology, which is applied in the repair/maintenance of lithium batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve problems such as increased internal resistance, reduced capacity of lithium-sulfur batteries, platform decline, etc., to prolong life , Reduce the internal resistance of the battery, the effect of low cost

Active Publication Date: 2021-11-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for recovering the capacity of a lithium-sulfur battery, which solves the problems of reduced capacity, increased internal resistance, and platform degradation of the lithium-sulfur battery after repeated cycles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Old monomer-laminated aluminum-plastic housing soft bag having a capacity of 10AH, discharged to 1.7V, discharge current is 0.1c, and the capacity of the battery is 6.2ah; in the argon glove box to remove the old The outer casing is replaced with a new soft bag battery case, injecting new electrolyte; shelving 8 hours, charging from 500mA current constant flow to 3.7V after 0.5 hours, flowing up to 1.7V, then at the same current Constant current is charged to 2.8V and seals the battery. The resulting capacity returned to 8.7ah. After 300 1C magnification, the capacity is lowered to 5.6ah, and the capacity of the battery is restored to 8.2ah after the same method described above.

Embodiment 2

[0024] The old monomer laminated stainless steel shell of 50ah is 50ah, discharged to 1.7V, discharge current is 0.1c, the battery has a capacity of 36ah; the electro-liquid hole of the old lithium sulfur battery is removed, injected into injection Ethylene glycol dimethyl ether cleaning agent, oscillated for 2 hours, remove liquid in the battery; then placed the battery in a vacuum drying tank for 8 hours, then transfer the battery to a glove box with argon, reinjub into the electrolyte After retaining the liquid hole; after standing for 8 hours, charging the current constant flow of 10A to 3.5 V, put it by 10A current constant flow to 1.7V after 0.5 hours, then charge the same current constant flow to 2.8V. The resulting capacity returned to 44ah. After 250 1C magnification, the capacity is reduced to 29ah, and the capacity of the battery is restored to 41AH with the same method described above.

Embodiment 3

[0026] The niche of the old monomer wound stainless steel shell of 100ah is tested. The cylindrical lithium sulfur battery is discharged to 1.7V, the discharge current is 0.1c, the battery is 68ah; the electrical hole of the old lithium sulfur battery is removed, Tetraethyllol dimethyl ether cleaner, soak for 3 hours, remove the liquid in the battery; then place the battery in a vacuum drying tank for 8 hours, then transfer the battery to a glove box with argon, replace new The liquid bore, reinjub into the electrolyte, seal the liquid liquid hole; after standing for 8 hours, charging the current constant flow of 20A to 3.5V, put it on the 40A current constant flow to 1.7V, then in the same Current constant flow charges to 2.8V. The resulting capacity is restored to 89ah. After 100 1C magnification, the capacity is lowered to 54ah, and the battery capacity returns to 76ah after the same method described above.

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PUM

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Abstract

The invention belongs to the field of chemical power sources, and in particular relates to a method for recovering the capacity of a lithium-sulfur battery, comprising the following steps: discharging the old battery, updating the electrolyte, forming and sealing. By updating the electrolyte in the old battery, the problem that the sulfur positive electrode and its intermediate products are easily precipitated in the lithium-sulfur battery system is effectively solved, thereby reducing the capacity; the invention achieves the effect of restoring the capacity of the lithium-sulfur battery by updating the electrolyte; the invention has a simple process , low cost, effectively prolonging the life of lithium-sulfur batteries.

Description

Technical field [0001] The present invention belongs to the field of chemical power supply, and more particularly to a method of recovery of a lithium sulfur battery capacity. Background technique [0002] Lithium sulfur batteries have a higher theoretical specific capacity and higher energy density compared to lithium-ion batteries, which have important application value in the fields of transportation energy storage. [0003] For a lithium sulfur battery, a polysulfide is formed during the discharge process, which will cause the conductive agent and the binder portion in the positive electrode material from the current collector, a substantial blocking diaphragm, increase the internal resistance of the battery, and reduce the battery capacity. . [0004] The application number is 201510041669.X patent "lithium sulfur battery charge and discharge management method" discloses a management method for charging discharge of lithium sulfur cells, which is proposed to charge a lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/052
CPCH01M10/052H01M10/4242Y02E60/10
Inventor 张汉平王亮周佩张圣景程春雷
Owner CHANGZHOU UNIV
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