Negative prelithiated electrode and preparation method thereof

A pre-lithium and electrode technology, which is applied in the direction of electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve the problems of reducing the processing performance and safety performance of pole pieces, so as to improve cycle stability and safety, and reduce damage Risk of oxidation, effect of improving total capacity and energy density

Inactive Publication Date: 2020-12-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pre-lithium electrodes are extremely prone to chemical reactions with water and air in ordinary environments, thereby reducing the processing performance and safety performance of the pole piece

Method used

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  • Negative prelithiated electrode and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of negative electrode pre-lithium electrode, comprising the following steps:

[0030] S1. Coat the negative electrode active material (silicon oxide composite material, wherein the weight ratio of SiO and graphite is 1:4), binder, and conductive agent on the surface of copper foil to make negative electrode roll (coated Copper foil with active material layer) for standby, the thickness of the active material layer is 103 μm;

[0031] Then in the drying room, pass the pure lithium strip and the PET film through the unwinding guide rollers of the calender in order to transfer the metal lithium to the PET film, and then pass the negative electrode roll and the PET film containing metal lithium through the composite equipment respectively. Rolling guide rollers, performing calendering to complete the pre-lithium treatment to obtain an intermediate electrode coated with a pre-lithium layer, wherein the thickness of the pre-lithium layer is controlled to ...

Embodiment 2

[0034] A preparation method of negative electrode pre-lithium electrode, comprising the following steps:

[0035] S1. Homogenize the negative electrode active material (graphite), binder, and conductive agent and apply it on the surface of the copper foil to make a negative electrode roll (copper foil coated with an active material layer) for later use. The thickness of the active material layer is 120 μm ;

[0036] Place the negative electrode roll on the upper part of the cavity of the vacuum coating machine and fix it, place the metal lithium ingot to be deposited on the lower part of the cavity of the vacuum coating machine and fix it, and use the vacuum evaporation method to perform pre-lithium treatment and deposit a layer of metal lithium on the surface of the negative electrode roll to obtain An intermediate electrode coated with a pre-lithium layer, wherein the thickness of the pre-lithium layer is 1 μm;

[0037] S2. Immerse polyvinyl alcohol in dimethyl sulfoxide so...

Embodiment 3

[0039] A preparation method of negative electrode pre-lithium electrode, comprising the following steps:

[0040] S1, the negative electrode active material (tin dioxide composite material, wherein, SnO 2 The weight ratio of graphite and graphite is 1:4), binder and conductive agent are homogenized and coated on the surface of titanium foil to make negative electrode roll (titanium foil coated with active material layer) for subsequent use. The thickness of the active material layer is 108μm;

[0041] After the pure lithium strip is connected to the negative electrode roll, it is placed in a lithium salt solution, and the electrochemical deposition method is used to perform pre-lithium treatment to obtain an intermediate electrode coated with a pre-lithium layer, wherein the thickness of the pre-lithium layer is 2 μm;

[0042] S2. Immerse sericin powder in tetrahydrofuran solution, wherein the mass of sericin is 6% of the mass of tetrahydrofuran, and then magnetically stir at...

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Abstract

The invention discloses a negative prelithiated electrode. The negative prelithiated electrode comprises a metal current collector, and an active substance layer, a lithium supplementing layer and a functional polymer film protection layer which sequentially coat the surface of the metal current collector, wherein a functional polymer is a polymer containing a lithium-philic polar functional group. The invention discloses a preparation method of the negative prelithiated electrode. The preparation methodcomprises the following steps: S1, coating the surface of the metal current collector withthe active substance, and carrying out prelithiation treatment to obtain an intermediate electrode; and S2, mixing and stirring the functional polymer and an organic solvent for 6-10h, conducting standing for 12-24h, uniformly coating the surface of the intermediate electrode with a formed supernatant, and performing vacuum drying at 45-85 DEG C to obtain the negative prelithiated electrode. The risk that the lithium supplementing layer of the prelithiated electrode is oxidized can be effectively reduced, and the initial efficiency, the energy density, the cycling stability and the safety performance of a lithium ion battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a negative pre-lithium electrode and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of lithium-ion secondary batteries and the stricter national policy requirements for new energy vehicle subsidies for lithium-ion batteries, the energy density of lithium-ion battery systems with traditional positive and negative electrode materials is close to the upper limit, and the demand is higher Energy-dense battery manufacturing processes are imminent. The development of pre-lithiation technology has the advantage of increasing the capacity of lithium-ion single cells under the same conditions, and has gradually attracted widespread attention of scientific research and technical personnel. [0003] At present, with the assistance of pre-lithiation technology, the commonly used graphite negative electrode and silicon-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/04H01M10/0525
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/0404H01M4/0419H01M10/0525Y02E60/10
Inventor 李雪梅张俊曹勇许涛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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