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Lithium battery anode material and preparation method thereof, and lithium battery

A negative electrode material, lithium battery technology, applied in the direction of battery electrodes, electrode carriers/collectors, secondary batteries, etc., can solve the problem 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 and other problems, to achieve the effect of improving the first charge and discharge efficiency, reducing the first capacity loss, and reducing the amount of electrolyte injection

Inactive Publication Date: 2019-10-29
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 anode material and preparation method thereof, and lithium battery
  • Lithium battery anode material and preparation method thereof, and lithium battery
  • Lithium battery anode material and preparation method thereof, and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Prepare lithium battery negative electrode material according to general method, wherein,

[0074] In step (1), the average particle diameter of the silicon oxide inner core is 1 μm;

[0075] In step (2), using pitch as a carbon source, a carbon coating layer with a thickness of 2 μm is formed on the surface of the silicon oxide core by a liquid phase coating method;

[0076] In step (3), the electrolyte solution components include: ethylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 1:1:1 (volume ratio), vinylene carbonate 0.1v%, the artificial SEI thickness that forms is 2nm.

Embodiment 2

[0078] Prepare lithium battery negative electrode material according to general method, wherein,

[0079] In step (1), the average particle diameter of the silicon oxide inner core is 3 μm;

[0080] In step (2), using ethane as a carbon source, a carbon coating layer with a thickness of 10 μm is formed on the surface of the silicon oxide core;

[0081] In step (3), the electrolyte solution components include: ethylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 1:1.5:1 (volume ratio), vinylene carbonate 0.5v%, the artificial SEI thickness that forms is 1.5nm.

Embodiment 3

[0083] Prepare lithium battery negative electrode material according to general method, wherein,

[0084] In step (1), the average particle diameter of the silicon oxide inner core is 5 μm;

[0085] In step (2), using propane as a carbon source, a carbon coating layer with a thickness of 30 μm is formed on the surface of the silicon oxide core;

[0086] In step (3), the electrolyte solution components include: ethylene carbonate: dimethyl carbonate: ethyl methyl carbonate=1.5:1.5:1 (volume ratio), vinylene carbonate 1v%, fluoroethylene carbonate 5v% , lithium bis(fluorosulfonyl)imide 2.5v%, lithium bisfluorophosphate content 1.5v%, vinylene sulfate 5v%, propylene sulfite 5v%, tris(trimethylsilane) borate 5v% , the thickness of the formed artificial SEI is 10nm.

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Abstract

The invention discloses a lithium battery anode material, a preparation method thereof and a lithium battery. The lithium battery anode material comprises: a silica inner core; a carbon coating layerformed on at least one portion of the surface of the silica core; and a solid electrolyte interface layer formed on at least one portion of the surface of the carbon coating layer. The surface of thelithium battery anode material is provided with an artificially formed solid electrolyte interface layer, and the lithium battery prepared from the anode material has the excellent first charge-discharge efficiency and the excellent cycle performance.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular, the invention relates to a lithium battery negative electrode material, a preparation method thereof, and a lithium battery. Background technique [0002] During the first charging and discharging process of the liquid lithium-ion battery, the electrode material and the electrolyte react at the solid-liquid phase 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, an electronic insulator but a Li + good conductor of Li + It can be freely inserted and extracted through the passivation layer, so this passivation film is called solid electrolyte interphase (SEI, SEI film or SEI layer for short). [0003] The formation of SEI has a crucial impact on the performance of electrode materials. SEI is insoluble in organic solvents and can exist stably in or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/0525H01M4/66
CPCH01M4/366H01M4/386H01M4/583H01M4/625H01M4/667H01M10/0525Y02E60/10
Inventor 李雷邱昭政李子凡
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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