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A method for supplementing lithium in lithium-ion batteries through positive electrodes

A lithium-ion battery and positive electrode technology, which is applied to battery electrodes, secondary batteries, and electrode collector coatings, can solve the problems of reduced pre-lithium effect and metal lithium deterioration, and achieves increased Coulombic efficiency and easy industrial scale-up production , Realize the effect of industrialized scale-up production

Active Publication Date: 2022-05-24
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the longer the metal lithium is exposed to the air, the more serious the deterioration of the metal lithium (may react with nitrogen, oxygen, etc.)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The present embodiment provides a method for replenishing lithium in a lithium-ion battery through a positive electrode, which specifically includes the following steps:

[0053] (1) The lithium iron phosphate positive electrode slurry and the passivation lithium metal slurry are coated on the aluminum foil by the double-layer coating technology, wherein the positive electrode slurry is on the bottom layer, and the passivation lithium metal slurry is on the top layer.

[0054] In the positive electrode slurry, the positive electrode active material is lithium iron phosphate, the conductive agent is multi-walled carbon nanotubes, the binder is polyvinylidene fluoride, the solvent is NMP,

[0055] Taking the total mass of positive active material, conductive agent and binder as 100%, the proportion of positive active material is 96%, the proportion of conductive agent is 1.5%, and the proportion of binder is 2.5%;

[0056] In the passivation lithium metal slurry, the pass...

Embodiment 2

[0062] The present embodiment provides a method for replenishing lithium in a lithium-ion battery through a positive electrode, which specifically includes the following steps:

[0063] (1) The lithium iron phosphate positive electrode slurry and the passivation lithium metal slurry are coated on the aluminum foil by the double-layer coating technology, wherein the positive electrode slurry is on the bottom layer, and the passivation lithium metal slurry is on the top layer.

[0064] In the positive electrode slurry, the positive electrode active material is lithium iron phosphate, the conductive agent is multi-walled carbon nanotubes, the binder is polyvinylidene fluoride, and the solvent is DMF,

[0065] Taking the total mass of positive active material, conductive agent and binder as 100%, the proportion of positive active material is 96%, the proportion of conductive agent is 1.5%, and the proportion of binder is 2.5%;

[0066] In the passivation lithium metal slurry, the ...

Embodiment 3

[0072] The present embodiment provides a method for replenishing lithium in a lithium-ion battery through a positive electrode, which specifically includes the following steps:

[0073] (1) The lithium iron phosphate positive electrode slurry and the passivation lithium metal slurry are coated on the aluminum foil by the double-layer coating technology, wherein the positive electrode slurry is on the bottom layer, and the passivation lithium metal slurry is on the top layer.

[0074] In the positive electrode slurry, the positive electrode active material is lithium iron phosphate, the conductive agent is single-walled carbon nanotubes, the binder is polyvinylidene fluoride, the solvent is NMP,

[0075] Taking the total mass of positive active material, conductive agent and binder as 100%, the proportion of positive active material is 96%, the proportion of conductive agent is 1.5%, and the proportion of binder is 2.5%;

[0076] In the passivation lithium metal slurry, the pas...

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Abstract

The invention discloses a method for replenishing lithium in a lithium ion battery through a positive electrode. The method includes: 1) On both sides of the positive electrode current collector, the positive electrode slurry and the passivated lithium powder slurry are sequentially coated, dried, and rolled, and the positive electrode sheet material layer is sequentially formed on both sides of the surface of the positive electrode current collector and a passivated lithium layer to obtain a positive electrode precursor sheet; 2) process the positive electrode precursor sheet with a nitrogen gas flow, and the nitrogen reacts with the passivated lithium layer on the surface to form a positive electrode sheet; 3) assemble the positive electrode sheet The battery cell is assembled to obtain the battery, which is charged and discharged to realize the lithium replenishment of the battery. The pre-lithiated positive electrode material of the present invention can be produced under conventional process procedures and conventional temperature and humidity, and is easy to realize industrial scale-up production.

Description

technical field [0001] The invention relates to the technical field of new energy, and relates to a method for replenishing lithium in a lithium ion battery through a positive electrode. Background technique [0002] Conventional lithium-ion batteries suffer from the loss of active lithium ions during charge-discharge cycles. Different battery systems have different rates of lithium ion loss. For example, the high nickel ternary cathode material / silicon oxide anode material system has a faster loss rate of active lithium ions. Mechanistically, the loss of active lithium ions may be caused by structural decay of positive and negative active materials and interfacial side reactions. The consequence of the loss of active lithium ions is a decrease in battery capacity and a shortened cycle life. [0003] In response to the above problems, the current technical means include improving the structural stability of active species (such as adding a stable and dense coating layer on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M4/04H01M10/0525
CPCH01M10/058H01M4/0404H01M4/0445H01M10/0525Y02E60/10Y02P70/50
Inventor 朱金鑫刘浩娄帅宾
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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