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Lithium battery negative electrode active material and preparation device and method thereof

A negative electrode active material, lithium battery technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of reducing the charge and discharge efficiency of electrode materials, SEI on the surface of electrode materials needs to be further deepened, and the irreversible capacity of the first charge and discharge increases.

Pending Publication Date: 2021-11-19
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formation of SEI consumes part of lithium ions, which increases the irreversible capacity for the first charge and discharge and reduces the charge and discharge efficiency of electrode materials.
Therefore, the study of SEI on the surface of electrode materials still needs to be further deepened.

Method used

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  • Lithium battery negative electrode active material and preparation device and method thereof
  • Lithium battery negative electrode active material and preparation device and method thereof
  • Lithium battery negative electrode active material and preparation device and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The negative electrode material for lithium battery is prepared according to the general method, wherein,

[0070] In step (1), the average particle size of the silicon oxide core is 1 μm;

[0071] In step (2), using pitch as a carbon source, a carbon coating layer with a thickness of 2 nm is formed on the surface of the silicon oxide core by a liquid-phase coating method;

[0072] In step (3), the components of the electrolyte solution include: ethylene carbonate: dimethyl carbonate: ethyl methyl carbonate=1:1:1 (volume ratio), 0.1 v% of vinylene carbonate, and the thickness of the formed artificial SEI is 2nm.

Embodiment 2

[0074] The negative electrode material for lithium battery is prepared according to the general method, wherein,

[0075] In step (1), the average particle size of the silicon oxide core is 3 μm;

[0076] In step (2), using ethane as a carbon source, a carbon coating layer with a thickness of 10 nm is formed on the surface of the silicon oxide inner core;

[0077] In step (3), the components of the electrolyte solution include: ethylene carbonate: dimethyl carbonate: ethyl methyl carbonate=1:1.5:1 (volume ratio), 0.5v% of vinylene carbonate, and the thickness of the formed artificial SEI is 1.5nm.

Embodiment 3

[0079] The negative electrode material for lithium battery is prepared according to the general method, wherein,

[0080] In step (1), the average particle size of the silicon oxide core is 5 μm;

[0081] In step (2), using propane as the carbon source, a carbon coating layer with a thickness of 30 nm is formed on the surface of the silicon oxide inner core;

[0082] In step (3), the electrolyte solution components include: ethylene carbonate: dimethyl carbonate: ethyl methyl carbonate=1.5:1.5:1 (volume ratio), 1v% of vinylene carbonate, 5v% of fluoroethylene carbonate , 2.5v% lithium bis(fluorosulfonyl)imide, 1.5v% lithium bisfluorophosphate, 5v% vinylene sulfate, 5v% propylene sulfite, 5v% tris(trimethylsilane) borate , the thickness of the artificial SEI formed is 10 nm.

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Abstract

The invention discloses a lithium battery negative electrode active material and a preparation device and method thereof. The preparation device of the lithium battery negative electrode active material comprises an electrolytic tank which is filled with electrolyte; a plurality of anode box bodies which are arranged in the electrolytic tank, wherein an anode conductive bag is arranged in each anode box body, and the anode conductive bags are suitable for containing lithium battery cathode active material precursors; a plurality of cathode plates, wherein one cathode plate is arranged between two adjacent anode box bodies; and a power supply connected with the anode conductive bags and the cathode plates. According to the preparation device of the lithium battery negative electrode active material, SEI can be artificially formed on the surface of a lithium battery negative electrode active material precursor by simulating full battery circulation, so that the electrochemical performance such as the first charge-discharge efficiency and the cycle performance of the negative electrode active material is remarkably improved.

Description

technical field [0001] The present invention relates to the field of lithium battery electrode materials, and in particular, the present invention relates to a lithium battery negative electrode active material and a preparation device and method thereof. Background technique [0002] During the first charge and discharge of a liquid lithium-ion battery, the electrode material and the electrolyte react at the solid-liquid interface to form a passivation layer covering the surface of the electrode material. This passivation layer is an interfacial layer that has the characteristics of a solid electrolyte and is an electronic insulator but Li + excellent conductor of , Li + The passivation layer can be freely embedded and extracted, so this passivation film is called a solid electrolyte interphase (SEI, SEI film or SEI layer for short). [0003] As the current consumer market has higher and higher requirements for the cruising range of electric vehicles and the energy consum...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/48H01M10/0525
CPCH01M4/483H01M4/62H01M4/628H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 邱昭政赵育松李文龙梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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