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Method for forming lithium ion battery and lithium ion battery

A lithium-ion battery and lithium salt technology, which is applied in the direction of secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc. Solvent decomposition potential is difficult to find, formation time and temperature are difficult to match, etc., to achieve the effect of reducing lithium ion consumption, precise and controllable composition, and simple operation

Pending Publication Date: 2022-05-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, a combination of voltage and current is usually used to initialize the lithium-ion battery. However, the nucleation and growth mechanism of the solid electrolyte interface film of the lithium-ion battery is still unclear in the prior art. Lithium salts and solvent decomposition potentials are difficult to find, which makes it difficult to match the formation time and temperature. It is difficult to show a clear correlation between the structure and composition of the solid electrolyte interfacial film and the voltage, current and temperature signals. Therefore, the formation method is usually difficult to achieve. Controllable and precise formation of

Method used

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  • Method for forming lithium ion battery and lithium ion battery
  • Method for forming lithium ion battery and lithium ion battery
  • Method for forming lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] After the lithium-ion battery is filled and sealed: (1) stand at a high temperature of 40°C for 1.0h; (2) charge at a constant voltage of 1.2V at a low temperature of -10°C for 0.5h; (3) charge at a temperature of -10°C Charge at a low temperature with a pulse current of 0.01C for 0.1s, and the number of pulses is 2 times; (4) charge at a low temperature of -10°C with a constant voltage of 2.2V for 0.5h; (5) stand at a high temperature of 40°C for 1.0h ; (6) Exhaust the generated gas with a vacuum degree of 0.1MPa, and the exhaust time is 3s, and repackage the battery.

[0115] Among them, the lithium-ion battery is a full battery with a lithium iron phosphate positive electrode matched with a graphite negative electrode; the negative electrode solid electrolyte interface film obtained after formation presents an organic-inorganic interwoven structure.

Embodiment 2

[0117] After the lithium-ion battery is filled and sealed: (1) stand still at a high temperature of 55°C for 5.0h; (2) charge at a constant voltage of 1.8V at a low temperature of 0°C for 48h; (3) charge at a low temperature of 0°C with Charge with a pulse current of 0.1C for 10s, and the number of pulses is 10 times; (4) charge with a constant voltage of 3.0V at a low temperature of 0°C for 48h; (5) stand at a high temperature of 60°C for 5.0h; (6) charge with a constant voltage of 0.8 The vacuum degree of MPa exhausts the generated gas, and the exhaust time is 20s, and the battery is repackaged.

[0118] Among them, the lithium-ion battery is a full battery with a lithium iron phosphate positive electrode matched with a silicon-carbon negative electrode; the negative electrode solid electrolyte interface film obtained after formation presents an organic-inorganic interwoven structure.

Embodiment 3

[0120] After the lithium-ion battery is filled and sealed: (1) stand at a high temperature of 45°C for 2.5 hours; (2) charge at a constant voltage of 1.6V at a low temperature of -5°C for 2 hours; (3) charge at a low temperature of -5°C Charge for 5s with a pulse current of 0.05C, and the number of pulses is 4 times; (4) charge with a constant voltage of 2.6V at a low temperature of -5°C for 24h; (5) stand at a high temperature of 50°C for 24.0h; (6) ) Exhaust the generated gas with a vacuum of 0.3MPa, the exhaust time is 5s, and repackage the battery.

[0121] Among them, the lithium-ion battery is a full battery with a lithium iron phosphate positive electrode matched with a lithium-carbon negative electrode; the negative electrode solid electrolyte interface film obtained after formation presents an organic-inorganic layered structure.

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Abstract

The invention discloses a method for forming a lithium ion battery and the lithium ion battery, and the method for forming the lithium ion battery comprises the following steps: a first standing step: carrying out first standing treatment on the lithium ion battery after liquid injection and sealing so as to diffuse an electrolyte; the first charging step is used for carrying out first constant-voltage charging treatment and pulse current charging treatment on the lithium ion battery subjected to the first standing treatment, so that lithium salt in the electrolyte is decomposed; the second charging step is used for performing second constant-voltage charging treatment on the lithium ion battery subjected to the pulse current charging treatment, so that the organic solvent in the electrolyte is decomposed; a second standing step for performing second standing treatment on the lithium ion battery subjected to the second constant-voltage charging treatment so as to age the solid electrolyte interface film; and a vacuum exhaust step: performing vacuum exhaust treatment on the lithium ion battery after the second standing treatment, and packaging the lithium ion battery to obtain the formed lithium ion battery.

Description

technical field [0001] The application belongs to the technical field of batteries, and in particular relates to a method for forming a lithium-ion battery and the lithium-ion battery. Background technique [0002] The birth of lithium-ion batteries has quickly changed the way of life of human beings due to its high energy density, long cycle life, and no memory. performance, have been widely used. [0003] When the lithium-ion battery is working, a layer of solid electrolyte interface film will be formed at the electrode interface of the negative electrode under the drive of voltage. The solid electrolyte interface film has good electronic insulation and can conduct ions quickly at the same time. However, the formation of the solid electrolyte interface film needs to consume lithium ions on the positive electrode side. Therefore, the first coulombic efficiency, initial energy density, and cycle life of the battery depend largely on the initial characteristics of the solid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/44H01M10/0525Y02E60/10Y02P70/50
Inventor 张强闫崇姚雨星岳昕阳李泽珩
Owner TSINGHUA UNIV
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