Pre-lithiation method of lithium ion battery negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, electrode carriers/collectors, non-aqueous electrolyte batteries, etc., can solve the problems of increased electrolyte viscosity, complex process, and high cost

Active Publication Date: 2015-04-22
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires low temperature operation, the process is more complicated, the cost is high, and the electrolyte viscosity increases at low temperature, and the liquid injection operation is difficult.

Method used

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  • Pre-lithiation method of lithium ion battery negative electrode material
  • Pre-lithiation method of lithium ion battery negative electrode material
  • Pre-lithiation method of lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1As shown, a thin metal lithium layer with a thickness of 0.1 mm is embedded on the copper foil current collector 21, and then the copper foil current collector 22 coated with the negative electrode slurry 1 is passed through Cr with a resistance value of 1Ω. 20 Ni 80 The resistance wire is connected to the copper foil current collector 21, wherein the weight of the metal lithium thin layer is 10% of the weight of the silicon-silicon oxide-carbon composite negative electrode material, and then the above-mentioned processed negative electrode and positive electrode are assembled into a Lithium-ion battery, standing for 24 hours to activate.

Embodiment 2

[0043] like figure 2 As shown, a layer of copper foil is tightly wrapped on the surface of the 0.1mm metal lithium thin layer embedded and pressed on the copper foil current collector 21 as a lithium ion barrier layer, and two holes with a diameter of 0.5mm micropores, and then the copper foil current collector 22 coated with the negative electrode slurry 1 is connected to the copper foil current collector 21 through a copper wire with a resistance value R=0.005Ω, wherein the weight of the metal lithium thin layer 10% of the weight of the silicon-silicon oxide-carbon composite negative electrode material, and then assemble the above-mentioned negative electrode and positive electrode into a lithium-ion battery, and let it stand for activation for 24 hours.

Embodiment 3

[0045] A layer of paraffin wax is tightly wrapped on the surface of the metal lithium thin layer 3 with a thickness of 0.1 mm embedded on the copper foil current collector 21 as a lithium ion barrier layer, and a microscopic hole with a pore size of 0.2 mm is punctured on the paraffin wax as the barrier layer. hole, and then the copper foil current collector 22 coated with the negative electrode slurry 1 is connected to the copper foil current collector 21 through a copper wire with a resistance value R=0.005Ω, wherein the weight of the metal lithium thin layer is silicon-silicon 10% by weight of the oxide-carbon composite negative electrode material, and then assemble the above-mentioned negative electrode and positive electrode into a lithium-ion battery, and leave it to activate for 24 hours.

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Abstract

The invention discloses a pre-lithiation method of a lithium ion battery negative electrode material. The method is characterized in that by adopting a method of coating or covering the surface of metal lithium with a lithium ion barrier layer and/or controlling a resistance value of a connection conductor, the pre-lithiated current magnitude is limited, and the reaction speed of a primary battery between metal lithium and negative electrode materials is regulated so as to regulate the lithium-intercalation speed of the negative electrode material and formation speed of surface SEI films, and the circulation performance of the negative electrode material is improved based on the improvement on coulombic efficiency for the first time of the negative electrode material; moreover, the method is simple in process and easy to operate, and suitable for pre-lithiation of the commercial lithium ion battery negative electrode material; lithium consumed by irreversible reaction is supplemented, so that the coulombic efficiency for the first time and the capacity of the battery are increased, and the circulation performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of pre-lithiation methods for lithium-ion battery materials, in particular to a pre-lithiation method for lithium-ion battery negative electrode materials. Background technique [0002] With the rapid development of electronic products, the demand for high-energy and high-power-density lithium-ion batteries is increasing year by year. Non-graphitizable carbon materials, oxide materials, and composite materials have attracted much attention due to their high power or high capacity. However, this type of material has serious problems of high irreversible capacity and low initial Coulombic efficiency, which can easily lead to a significant decline in the capacity of lithium-ion batteries. At present, in order to solve the problem of low coulombic efficiency of lithium-ion battery anode materials for the first time, people have developed chemical reduction method, artificial SEI film method and electrochemical pre-lithiat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/38H01M4/62
CPCH01M4/139H01M4/362H01M4/64H01M4/66H01M10/058Y02E60/10
Inventor 徐宁梁运辉高川杨化滨吴孟涛
Owner TIANJIN B&M SCI & TECH
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