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A kind of negative electrode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as low specific surface area, affecting battery performance, etc. The method is simple and the effect of speeding up the transmission

Active Publication Date: 2020-08-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently used vanadium trioxide and molybdenum dioxide are mostly in the form of single nanospheres or nanorods, and the specific surface area is low, which affects the further improvement of battery performance. Therefore, the two oxides are synthesized by hydrothermal reaction. Core-shell structure Molybdenum dioxide coated with vanadium trioxide improves battery performance

Method used

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  • A kind of negative electrode material of lithium ion battery
  • A kind of negative electrode material of lithium ion battery
  • A kind of negative electrode material of lithium ion battery

Examples

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Embodiment 1

[0020] This embodiment prepares the vanadium trioxide-coated molybdenum dioxide of core-shell structure according to the following steps:

[0021] 1. Put 1.0g of ammonium molybdate and 0.3313g of ammonium metavanadate in a conical flask, then add 40mL of deionized water, stir at room temperature until light yellow, and then obtain a mixed precursor of ammonium metavanadate and ammonium molybdate solution;

[0022] 2. Mix the above precursor solution and deionized water at a volume ratio of 1:35 and stir evenly, then add 0.5ml of acetic acid and stir for 10min, then add 0.01510g of thiourea, and continue stirring for 15min. Then hydrothermally reacted at 180°C for 24 hours; the obtained product was placed in a centrifuge tube and centrifuged at a speed of 3000rmp, then washed three times with water and ethanol, and then dried at 40°C to obtain the target product of the core-shell structure Vanadium coated molybdenum dioxide. The role of acetic acid is to etch the material to ...

Embodiment 2

[0030] This embodiment prepares the vanadium trioxide-coated molybdenum dioxide of core-shell structure according to the following steps:

[0031] 1. Put 1.0mol ammonium molybdate and 0.3mol ammonium metavanadate in a conical flask, then add 45mL deionized water, stir at room temperature until light yellow, and then obtain a mixed precursor of ammonium metavanadate and ammonium molybdate solution;

[0032] 2. Mix the above precursor solution and deionized water at a volume ratio of 1:35 and stir evenly, then add 0.2mol acetic acid and stir for 10min, then add 0.01mol thiourea, and continue stirring for 15min. Then hydrothermally reacted at 180°C for 24 hours; the obtained product was placed in a centrifuge tube and centrifuged at a speed of 5000rmp, then washed three times with water and ethanol, and then dried at 90°C to obtain the target product core-shell structure Vanadium coated molybdenum dioxide. The role of acetic acid is to etch the material to form a flaky shape; t...

Embodiment 3

[0034] This embodiment prepares the vanadium trioxide-coated molybdenum dioxide of core-shell structure according to the following steps:

[0035] 1. Put 1.0mol ammonium molybdate and 0.25mol ammonium metavanadate in a conical flask, then add 35mL deionized water, stir at room temperature until light yellow, and then obtain a mixed precursor of ammonium metavanadate and ammonium molybdate solution;

[0036] 2. Mix the above precursor solution and deionized water at a volume ratio of 1:35 and stir evenly, then add 1mol acetic acid and stir for 10min, then add 0.025mol thiourea, and continue stirring for 15min. Then hydrothermally reacted at 180°C for 24 hours; the obtained product was placed in a centrifuge tube and centrifuged at a speed of 1500rmp, then washed three times with water and ethanol, and then dried at 30°C to obtain the target product core-shell structure Vanadium coated molybdenum dioxide. The role of acetic acid is to etch the material to form a flaky shape; t...

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Abstract

The invention discloses a lithium ion battery negative material and a preparation method thereof. The lithium ion battery negative material has a shell-core structure in which vanadium trioxide coatsmolybdenum dioxide, and a petal-like fin structure extends out from the outer surface of the shell-core structure. The sheet structure extends outwards. Compared with the prior art, the lithium ion battery negative material has the following advantages: the shell-core structure, in which vanadium trioxide coats molybdenum dioxide, is used as the lithium ion battery negative material, and a lithiumion battery has good cycle stability, high cycle specific capacity and excellent performance; and the preparation method is simple, and the used raw materials are cheap and easily available, therebybeing favorable for commercial application.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, and in particular relates to a lithium-ion battery negative electrode material. Background technique [0002] The development of efficient and stable secondary battery energy storage technology is an important means to deal with the increasingly urgent energy and environmental problems. The rapid development of high-end consumer electronics (such as smartphones, wearable devices, electric vehicles, etc.) urgently requires secondary batteries with high specific energy. Vanadium trioxide coated molybdenum dioxide lithium ion battery is a secondary battery with molybdenum oxide as the negative electrode active material, which can still maintain high specific capacity and cycle performance under high current density cycles, so it can satisfy the needs of contemporary people. Demand for high energy density batteries. However, the currently used vanadium trioxide and molyb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M10/0525Y02E60/10
Inventor 邢献军刘建华王文泉李春晓陈泽宇蒋汶
Owner HEFEI UNIV OF TECH
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