Lithium ion battery, cathode material thereof and preparation method

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that hinder the practical application of micro-nano materials, pollute the environment by by-products, and complex preparation processes, and achieve low first-time efficiency improvements. , the effect of short experiment time and simple preparation process

Active Publication Date: 2017-01-04
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The materials obtained by the above methods have significant quantum size effect, small size effect and macroscopic quantum size effect, but the preparation process is relatively complicated, the experimen

Method used

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  • Lithium ion battery, cathode material thereof and preparation method
  • Lithium ion battery, cathode material thereof and preparation method
  • Lithium ion battery, cathode material thereof and preparation method

Examples

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Embodiment 1

[0039] This embodiment provides a negative electrode material for a lithium ion battery, the negative electrode material has a core-shell structure comprising a core layer and a shell layer; the core layer is antimony trioxide, the shell layer is antimony trisulfide, the core layer and the shell layer The mass ratio of the core layer is 1.43:1, the particle size of the core layer is 100nm-2μm, the thickness of the shell layer is 50nm-0.5μm, the microscopic shape of the core layer is rod-shaped, and its specific surface area is 217m 2 g -1 .

[0040] Its preparation method comprises the following steps:

[0041] In the first step, at room temperature, put 0.25g SbCl 3 Add it into 30mL deionized water, sonicate for 3min, magnetically stir for 20min, add 30mL of ethylene glycol, sonicate for 3min, magnetically stir for 20min, transfer to a hydrothermal kettle, keep warm at 160°C for 10h, and use deionized water and absolute ethanol alternately Centrifuge and wash three times a...

Embodiment 2

[0046] This embodiment provides a negative electrode material for a lithium ion battery, the negative electrode material has a core-shell structure comprising a core layer and a shell layer; the core layer is antimony trioxide, the shell layer is antimony trisulfide, the core layer and the shell layer The mass ratio of the core layer is 1.43:1, the particle size of the core layer is 100nm-2μm, the thickness of the shell layer is 50nm-0.5μm, the microscopic shape of the core layer is spherical, and its specific surface area is 370m 2 g -1 .

[0047] Its preparation method comprises the following steps:

[0048] In the first step, at room temperature, put 0.25g SbCl 3 Add it into 30mL deionized water, sonicate for 3min, magnetically stir for 20min, add 30mL of ethylene glycol, sonicate for 3min, magnetically stir for 20min, transfer to a hydrothermal kettle, keep warm at 160°C for 10h, and use deionized water and absolute ethanol alternately Centrifuge and wash three times at...

Embodiment 3

[0052] This embodiment provides a negative electrode material for a lithium ion battery, the negative electrode material has a core-shell structure comprising a core layer and a shell layer; the core layer is antimony trioxide, the shell layer is antimony trisulfide, the core layer and the shell layer The mass ratio of the core layer is 1.43:1, the particle size of the core layer is 100nm-2μm, the thickness of the shell layer is 50nm-0.5μm, the microscopic shape of the core layer is sea urchin-like, and its specific surface area is 457m 2 g -1 .

[0053] Its preparation method comprises the following steps:

[0054] In the first step, at room temperature, put 0.25g SbCl 3 Add it into 30mL deionized water, sonicate for 3min, magnetically stir for 20min, add 30mL of ethylene glycol, sonicate for 3min, magnetically stir for 20min, transfer to a hydrothermal kettle, keep warm at 160°C for 10h, and use deionized water and absolute ethanol alternately Centrifuge and wash three ti...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a cathode material for a lithium ion battery. The cathode material comprises a nuclear-shell structure with a nuclear layer and a shell layer, the nuclear layer is antimonous oxide, the shell layer is antimony trisulfide, and the mass ratio of the nuclear layer to the shell layer is (0.4-5):1. Compared with the prior art, prepared material powder has good uniformity and dispersity, is simple in preparation process, low in manufacturing cost, short in experimental time, low in environmental pollution and high in yield, and has an excellent industrial application prospect. The lithium ion battery cathode material is high in initial charge-discharge efficiency and specific capacity (reaching 900mAh/g for the first time and current commercial graphite theoretical specific capacity is 372mAh/g) and good in cycle performance, and effectively solves the problems of low initial efficiency and low specific capacity of a current lithium ion battery cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative electrode material for lithium ion batteries with large specific surface area, good uniformity and stable structure and a preparation method thereof, and a battery containing the negative electrode material with high specific capacity and stable battery life. Lithium-ion battery chemistry. Background technique [0002] With the increasing demand for energy in human society, the increase in consumption of fossil fuels (coal, oil, natural gas), and a series of environmental pollution problems brought about by the industrialization of human society, the search for an environmentally friendly green energy has gradually attracted people's attention. attention. Lithium-ion batteries have very broad application prospects in the field of new energy due to their high energy density, long cycle life, less environmental damage and low price. At present...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M10/0525
CPCH01M4/366H01M4/48H01M4/5815H01M10/0525Y02E60/10
Inventor 李宝华李海钱坤罗丹贺艳兵刘冬青李懿洋
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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