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Formation-free lithium ion cell pre-lithiation method and device

A technology of lithium ion and pre-lithiation, which is applied in the direction of circuits, electrical components, secondary batteries, etc., can solve problems such as difficult industrialization, increased cost of pre-lithiation, and complexity, so as to improve energy density and charge and discharge for the first time Efficiency, low cost of pre-lithiation, and process safety effects

Pending Publication Date: 2021-11-30
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current electrochemical pre-lithiation method is relatively complicated and additionally increases the cost of pre-lithiation, making it difficult to achieve industrialization

Method used

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  • Formation-free lithium ion cell pre-lithiation method and device
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  • Formation-free lithium ion cell pre-lithiation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for pre-lithiation of lithium-ion cells without formation, comprising the following steps:

[0037]S1. In a low-humidity environment with a dew point below -50°C, the side of the first limiting strip 19 close to the first square limiting platform 18 and the side of the second limiting strip 23 close to the second square limiting platform 22 are respectively fixed Lithium belt, and then put the bare cell (LFP / SiO) with qualified moisture after baking on the first square limiter, 18 and the second square limiter 22, and make both sides of the cell close to the lithium sheet , after all the batteries are put in, connect the wires with the lithium strip and lead them out of the device, close the base 1, the middle plate 2, and the upper cover 3, and inject electrolyte into the device through the liquid injection valve 26;

[0038] S2. Vacuum through the air valve 27 to make the vacuum degree reach 0.1MPa, and the cell soaking time is 36h;

[0039] S3. Connect the ...

Embodiment 2

[0043] A kind of pre-lithiation method that does not need to be formed after the pre-lithium of lithium-ion batteries comprises the following steps:

[0044] S1. In a low-humidity environment with a dew point below -50°C, the side of the first limiting strip 19 close to the first square limiting platform 18 and the side of the second limiting strip 23 close to the second square limiting platform 22 are respectively fixed Lithium belt, and then put the bare cell (LFP / SiO) with qualified moisture after baking on the first square limiter, 18 and the second square limiter 22, and make both sides of the cell close to the lithium sheet , after all the batteries are put in, connect the wires with the lithium strip and lead them out of the device, close the base 1, the middle plate 2, and the upper cover 3, and inject electrolyte into the device through the liquid injection valve 26;

[0045] S2. Vacuum through the air valve to make the vacuum degree reach 0.08MPa, and the cell soakin...

Embodiment 3

[0050] A kind of pre-lithiation method that does not need to be formed after the pre-lithium of lithium-ion batteries comprises the following steps:

[0051] S1. In a low-humidity environment with a dew point below -50°C, the side of the first limiting strip 19 close to the first square limiting platform 18 and the side of the second limiting strip 23 close to the second square limiting platform 22 are respectively fixed Lithium belt, and then put the bare cell (LFP / SiO) with qualified moisture after baking on the first square limiter, 18 and the second square limiter 22, and make both sides of the cell close to the lithium sheet , after all the batteries are put in, connect the wires with the lithium strip and lead them out of the device, close the base 1, the middle plate 2, and the upper cover 3, and inject electrolyte into the device through the liquid injection valve 26;

[0052] S2. Vacuum through the air valve to make the vacuum degree reach 0.08MPa, and the cell soakin...

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Abstract

The invention provides a formation-free pre-lithiation method and device for a lithium ion battery cell, and the pre-lithiation method comprises the following steps: fixing pre-lithiation films on the two sides of the length direction of the battery cell in a low-humidity environment, and then placing the battery cell in a vacuum cavity injected with an electrolyte for infiltration time T; and then connecting the negative electrode of the battery cell as a positive electrode and the pre-lithiation membrane as a negative electrode with a test cabinet for pre-lithiation. According to the pre-lithiation method, the manufacturing process of the pre-lithiation battery cell can be greatly simplified, and the whole process is safe and environment-friendly; the pre-lithiation cost is low, and the operability is high; and meanwhile, the pre-lithiation effect is good, and the energy density and the first charge-discharge efficiency of the battery are effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a method and device for pre-lithiation of lithium ion batteries without formation. Background technique [0002] In view of the high irreversible capacity of negative electrode materials and low initial charge and discharge efficiency (especially high-capacity silicon-based negative electrode materials), the energy density of batteries is reduced. People propose to use pre-lithiation technology to solve this problem. Pre-lithiation technology is an effective method to reduce irreversible capacity loss and improve Coulombic efficiency. The current research on pre-lithiation technology mainly includes lithium powder pre-lithiation, calendered lithium foil pre-lithiation, vacuum evaporation pre-lithiation, and electrochemical pre-lithiation. Although the pre-lithiation of lithium powder is more convenient to use, it is not safe because lithium powder particles ar...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M10/44
CPCH01M10/058H01M10/0525H01M10/44Y02E60/10Y02P70/50
Inventor 刘超辉林少雄谢强胜徐兴无申永宽卢芳
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY