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High-capacity and high-cycle lithium battery negative electrode material and preparation method thereof

A negative electrode material and lithium battery technology, applied in electrode manufacturing, battery electrodes, negative electrodes, etc., can solve the problems of poor cycle performance of negative electrode materials, and achieve high conductivity, stable performance, and tight integration

Active Publication Date: 2022-02-22
JIANGSU CNANO TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of poor cycle performance of negative electrode materials in the prior art, the first object of the present invention is to provide a method for preparing a high-capacity and high-cycle lithium battery negative electrode material. The preparation method is simple in operation, simple in process, and easy to control, so that the prepared anode material has excellent reversible capacity and cycle stability, which is suitable for mass production

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  • High-capacity and high-cycle lithium battery negative electrode material and preparation method thereof
  • High-capacity and high-cycle lithium battery negative electrode material and preparation method thereof
  • High-capacity and high-cycle lithium battery negative electrode material and preparation method thereof

Examples

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Embodiment 1

[0041] A preparation method of a high-capacity and high-cycle lithium battery negative electrode material, comprising the steps of:

[0042] (1) Mixing: GeO 2 The powder and the Si powder with a particle size of 7 μm are mixed according to the molar ratio of 1:3, and the planetary ball is milled for 3 hours to obtain the mixed powder SGO3; the particle size D10 of the mixed powder SGO3 is 2.13 μm, D50 is 31.58 μm, and the BET ratio Surface area is 3.85m 2 / g;

[0043] (2) Heat treatment: The mixed powder obtained in step (1) was reacted at a high temperature of 750°C for 3 hours under a nitrogen atmosphere to prepare a high-capacity and high-cycle lithium battery anode material SG2.

[0044] The high-capacity and high-cycle lithium battery negative electrode material prepared above has a three-layer coating structure, including Si core, composite intermediate layer and GeO 2 The outer layer, the composite middle layer is Ge and SiO 2 of composite materials.

[0045] See a...

Embodiment 2

[0047] A preparation method of a high-capacity and high-cycle lithium battery negative electrode material, comprising the steps of:

[0048] (1) Mixing: GeO 2 The powder and the Si powder with a particle size of 7 μm are mixed according to the molar ratio of 1:5, and the planetary ball is milled for 3 hours to obtain the mixed powder SGO5; the particle size D10 of the mixed powder SGO5 is 1.41 μm, D50 is 29.58 μm, and the BET ratio Surface area is 7.06m 2 / g;

[0049] (2) Heat treatment: react the mixed powder obtained in step (1) under a nitrogen atmosphere at a high temperature of 750°C for 3 hours to prepare a high-capacity and high-cycle lithium battery anode material SG4.

[0050] The high-capacity and high-cycle lithium battery negative electrode material prepared above has a three-layer coating structure, including Si core, composite intermediate layer and GeO 2 The outer layer, the composite middle layer is Ge and SiO 2 of composite materials.

[0051] See attache...

Embodiment 3

[0053] A preparation method of a high-capacity and high-cycle lithium battery negative electrode material, comprising the steps of:

[0054] (1) Mixing: GeO 2 The powder and the Si powder with a particle size of 7 μm are mixed according to the molar ratio of 1:9, and the planetary ball is milled for 3 hours to obtain the mixed powder SGO9; the particle size D10 of the mixed powder SGO9 is 0.802 μm, D50 is 4.24 μm, and the BET ratio Surface area is 5.42m 2 / g;

[0055] (2) Heat treatment: The mixed powder obtained in step (1) was reacted at a high temperature of 750°C for 3 hours in a nitrogen atmosphere to prepare a high-capacity and high-cycle lithium battery anode material SG8.

[0056] The high-capacity and high-cycle lithium battery negative electrode material prepared above has a three-layer coating structure, including Si core, composite intermediate layer and GeO 2 The outer layer, the composite middle layer is Ge and SiO 2 of composite materials.

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Abstract

The invention relates to the field of battery materials, and particularly discloses a high-capacity and high-cycle lithium battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps of: 1, mixing: mixing and grinding GeO2 powder and Si powder to obtain mixed powder; and (2) heat treatment: carrying out heat treatment on the mixed powder in a protective atmosphere to obtain the high-capacity and high-cycle lithium battery negative electrode material. The preparation method is simple to operate and simple in process. Combustible gases such as hydrogen are not introduced, and the preparation process is easy to control, so that the GeO2 powder and the Si powder are subjected to long-time high-temperature heat treatment to generate a Ge and SiO2 composite material intermediate layer, the intermediate layer is tightly combined with an Si inner core and a GeO2 outer layer to form the negative electrode material with a three-layer coating structure, and the negative electrode material has the advantages of both Si and SiO2. When applied to a lithium battery, the material has relatively high reversible capacity, first coulombic efficiency and capacity retention rate. The material is stable in performance and wide in application range.

Description

technical field [0001] The invention relates to the field of battery materials, more specifically, it relates to a high-capacity and high-cycle lithium battery negative electrode material and a preparation method thereof. Background technique [0002] In recent years, the demand for battery energy density in various fields has increased rapidly, especially for new energy vehicles to continuously increase the cruising range. At present, there is an urgent need to develop lithium-ion batteries with higher energy density. Lithium-ion batteries with high energy density are mainly developed from three directions: positive electrode materials, negative electrode materials and electrolytes. The development of positive and negative electrode materials with high energy density has become the development focus of major enterprises and research institutions. [0003] The current commercial lithium-ion batteries mainly use graphite as the negative electrode material. The theoretical sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/38H01M4/48H01M10/0525
CPCH01M4/0471H01M4/366H01M4/386H01M4/483H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 叶志国毛鸥赵贝贲颖颖张美杰郑涛
Owner JIANGSU CNANO TECHNOLOGY CO LTD
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