Step-by-step pre-lithiation method of lithium-ion battery negative plate

A lithium-ion battery and pre-lithiation technology, applied in the field of lithium-ion batteries, can solve the problems of unsatisfactory accuracy and uniformity environmental control, low efficiency, etc., to improve the efficiency and safety of pre-lithiation, and easily control the process conditions. , the effect of stable performance

Active Publication Date: 2019-05-10
SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a method for step-by-step pre-lithiation of lithium-ion battery negative electrodes, to solve the problems of low efficiency, accuracy and uniformity in the pre-lithiation of existing lithium-ion battery negative electrodes. Sexuality and unsatisfactory environmental control

Method used

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  • Step-by-step pre-lithiation method of lithium-ion battery negative plate
  • Step-by-step pre-lithiation method of lithium-ion battery negative plate
  • Step-by-step pre-lithiation method of lithium-ion battery negative plate

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Embodiment 1

[0061] This embodiment provides a step-by-step pre-lithiation method for a silicon-carbon negative electrode sheet. The step-by-step pre-lithiation method of the silicon carbon negative plate comprises the following steps:

[0062] Pass the silicon carbon negative electrode sheet to be treated sequentially through such as image 3 The shown pre-lithiation unit 1, pre-lithiation unit 2, pre-lithiation unit 3, pre-lithiation unit 4, pre-lithiation unit 5, and pre-lithiation unit 6 are respectively subjected to infiltration treatment and charging treatment,

[0063] Wherein, the composition that the electrolytic solution that pre-lithiation unit 1 comprises comprises is as follows:

[0064] Lithium salt: LiPF 6 0.9mol / L;

[0065] Film-forming additive: a mixture of fluoroethylene carbonate (FEC) and lithium difluorooxalate borate (LiODFB) with a mass ratio of 1:1, with a total content of 3%;

[0066] Solvent: a mixture of ethylene carbonate (EC) and propylene carbonate (PC) ...

Embodiment 2

[0084] This embodiment provides a step-by-step pre-lithiation method for a silicon-carbon negative electrode sheet. The step-by-step pre-lithiation method of the silicon carbon negative plate comprises the following steps:

[0085] Pass the silicon carbon negative electrode sheet to be treated sequentially through such as image 3 The shown pre-lithiation unit 1, pre-lithiation unit 2, pre-lithiation unit 3, pre-lithiation unit 4, pre-lithiation unit 5, and pre-lithiation unit 6 are respectively subjected to infiltration treatment and charging treatment,

[0086] Wherein, the composition that the electrolytic solution that pre-lithiation unit 1 comprises comprises is as follows:

[0087] Lithium salt: LiPF 6 0.5mol / L;

[0088] Film-forming additive: a mixture of fluoroethylene carbonate (FEC) and lithium difluorooxalate borate (LiODFB) with a mass ratio of 1:1, with a total content of 6%;

[0089] Solvent: a mixture of ethylene carbonate (EC) and propylene carbonate (PC) ...

Embodiment 3

[0106] This embodiment provides a step-by-step pre-lithiation method for a silicon-carbon negative electrode sheet. The step-by-step pre-lithiation method of the silicon carbon negative plate comprises the following steps:

[0107] Pass the silicon carbon negative electrode sheet to be treated sequentially through such as image 3 The shown pre-lithiation unit 1, pre-lithiation unit 2, pre-lithiation unit 3, pre-lithiation unit 4, pre-lithiation unit 5, and pre-lithiation unit 6 are respectively subjected to infiltration treatment and charging treatment,

[0108] Wherein, the composition that the electrolytic solution that pre-lithiation unit 1 comprises comprises is as follows:

[0109] Lithium salt: LiPF 6 1.2mol / L;

[0110] Film-forming additive: a mixture of fluoroethylene carbonate (FEC) and lithium difluorooxalate borate (LiODFB) with a mass ratio of 3:1, with a total content of 0.2%;

[0111] Solvent: a mixture of ethylene carbonate (EC) and propylene carbonate (PC...

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Abstract

The invention discloses a step-by-step pre-lithiation method of a lithium-ion battery negative plate. The method comprises the following steps that at least three pre-lithiation units including a first pre-lithiation unit, a second pre-lithiation unit and a last pre-lithiation unit are provided, wherein each pre-lithiation unit comprises an electrolyte solution containing lithium salts and a charging module used for forming and charging the lithium-ion battery negative plate; and the lithium-ion battery negative plate is sequentially introduced into the first pre-lithiation unit, the second pre-lithiation unit and finally the last pre-lithiation unit, and is sequentially immersed into the electrolyte solutions containing in the pre-lithiation units for infiltration treatment and is subjected to charging treatment through the charging modules. According to the step-by-step pre-lithiation method for the lithium-ion battery negative plate, step-by-step pre-lithiation is realized, and theuniform lithium supplement and the accurate lithium supplement to the lithium-ion battery negative plate are realized.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a step-by-step pre-lithiation method for negative electrodes of lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in mobile phone and notebook batteries, power batteries and energy storage batteries due to their excellent properties such as high voltage, high energy density and long cycle life. Among them, mobile phone and notebook batteries have been completely occupied by lithium-ion batteries, and other types of batteries cannot meet the stringent requirements of these portable smart devices. As the application of lithium-ion batteries becomes wider and wider, the requirements for lithium-ion batteries are also getting higher and higher. Performance requirements such as the energy density of lithium-ion batteries are also getting higher and higher. Among them, the performance of the electrode sheet is one of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1393H01M4/1395H01M10/0525
CPCY02E60/10
Inventor 王立福赖琪李婕斯
Owner SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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