Lithium battery hard carbon microsphere cathode material with core-shell structure and preparation method thereof

A core-shell structure and negative electrode material technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as voltage hysteresis, large irreversible capacity for the first charge and discharge, etc., achieve high capacity, reduce equipment corrosion, and be easy to stabilize.

Active Publication Date: 2012-03-21
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention aims to solve the problem that the charge-discharge curve of the hard carbon material has a relatively large initial charge-discharge irreversible capacity and voltage hysteresis, and provides a starch-based hard carbon microsphere negative electrode material with a surface graphitization structure to improve the hard carbon negative electrode. The overall performance of the material, the development of green, low-cost, hard carbon anode materials suitable for mass production

Method used

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Experimental program
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Effect test

Embodiment 1

[0037] A lithium battery hard carbon microsphere negative electrode material with a core-shell structure, characterized in that: the lithium battery hard carbon microsphere negative electrode material with a core-shell structure is made of starch-based hard carbon microspheres and a graphitized layer on the surface, The surface of the material has undergone catalytic graphitization treatment to form a graphitized layer, while the interior maintains a hard carbon structure; the particle size of the hard carbon microsphere anode material of the core-shell structure lithium battery is 2 μm, and the capacity reaches 0.1C when the current is 0.1C. 450~mAh / g, and the first efficiency reached 75%, and the capacity still reached 400mAh / g when discharged at a current of 10C, showing good power performance.

[0038] A method for preparing a lithium battery hard carbon microsphere negative electrode material with a core-shell structure, comprising the following process steps:

[0039] A....

Embodiment 2

[0054] A lithium battery hard carbon microsphere negative electrode material with a core-shell structure, characterized in that: the lithium battery hard carbon microsphere negative electrode material with a core-shell structure is made of starch-based hard carbon microspheres and a graphitized layer on the surface, The surface of the material has undergone catalytic graphitization treatment to form a graphitized layer, while the interior maintains a hard carbon structure; the particle size of the hard carbon microsphere negative electrode material of the lithium battery with the core-shell structure is 100 μm, and the capacity reaches 0.1C when the current is 0.1C. 520mAh / g, and the first efficiency reached 87%, and the capacity still reached 490mAh / g when discharged at a current of 10C, showing good power performance.

[0055] A method for preparing a lithium battery hard carbon microsphere negative electrode material with a core-shell structure, comprising the following proc...

Embodiment 3

[0071] A lithium battery hard carbon microsphere negative electrode material with a core-shell structure, characterized in that: the lithium battery hard carbon microsphere negative electrode material with a core-shell structure is made of starch-based hard carbon microspheres and a graphitized layer on the surface, The surface of the material has undergone catalytic graphitization treatment to form a graphitized layer, while the interior maintains a hard carbon structure; the particle size of the hard carbon microsphere negative electrode material for lithium batteries with a core-shell structure is 51 μm, and the capacity reaches 0.1C when discharged at a current of 0.1C 485mAh / g, and the first efficiency reached 81%, and the capacity still reached 445mAh / g when discharged at a current of 10C, showing good power performance.

[0072] A method for preparing a lithium battery hard carbon microsphere negative electrode material with a core-shell structure, comprising the followi...

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PUM

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Abstract

The invention provides a lithium battery hard carbon microsphere cathode material with core-shell structure and a preparation method thereof. The lithium battery hard carbon microsphere cathode material with core-shell structure is formed by starch and a graphitized layer as coating. The surface of the material is subjected to catalytic graphitization treatment to form the graphitized layer, and the inside of the material maintains the hard carbon structure. The product is made by preparing a starch-based hard carbon microsphere and performing catalytic graphitization treatment. Owing to the highly-graphitized coating layer, the first charge/discharge efficiency of the prepared carbon microsphere with core-shell structure is higher than the conventional hard carbon-based materials; and owing to the hard carbon inner structure, the capacity is higher and the magnification property is excellent.

Description

technical field [0001] The invention relates to a lithium battery material and a preparation method thereof. More specifically, the invention relates to a lithium battery hard carbon microsphere anode material with a core-shell structure and a preparation method thereof, belonging to the technical field of lithium ion battery anode materials. Background technique [0002] Lithium-ion secondary batteries (referred to as lithium batteries) have the advantages of high energy density, high working voltage, long cycle life, no pollution, and good safety performance. Based on these advantages, lithium batteries have broad application prospects in many aspects such as portable electronic devices, electric vehicles, large-scale energy storage, space technology, and national defense industry. [0003] The research on lithium battery anode materials has always been one of the key technologies of lithium ion batteries. Generally speaking, lithium battery anode materials are divided in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 王瑨胡蕴成郑威梁孜
Owner DONGFANG ELECTRIC CORP LTD
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