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Lithium-doped high-entropy oxide battery negative electrode material as well as preparation and application methods thereof

A battery negative electrode and negative electrode material technology, applied in the direction of chemical instruments and methods, battery electrodes, active material electrodes, etc., can solve the problems of low electronic conductivity, low charge-discharge reversible specific capacity, poor cycle stability, etc., to achieve simple process, Production and application promotion, high crystallinity effect

Active Publication Date: 2021-03-23
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]Aiming at the current high-entropy oxides and traditional transition metal oxides as negative electrode materials, such as low electronic conductivity, low charge-discharge reversible specific capacity and poor cycle stability Problem, the present invention provides a lithium-doped high-entropy oxide battery negative electrode material and its preparation and application method, using lithium-doped technology to improve material performance, and the method is simple and easy to operate

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  • Lithium-doped high-entropy oxide battery negative electrode material as well as preparation and application methods thereof
  • Lithium-doped high-entropy oxide battery negative electrode material as well as preparation and application methods thereof
  • Lithium-doped high-entropy oxide battery negative electrode material as well as preparation and application methods thereof

Examples

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Effect test

Embodiment 1

[0042] A lithium-doped high-entropy oxide battery negative electrode material, the chemical formula is (Li 1 / 7 Fe 1 / 7 co 1 / 7 Ni 1 / 7 Cr 1 / 7 mn 1 / 7 Zn 1 / 7 ) 3 o 4 ;

[0043] The particle size of the lithium-doped high-entropy oxide battery negative electrode material is 3-5 μm;

[0044] The negative electrode material of the lithium-doped high-entropy oxide battery is tested by the half-cell of the lithium-ion battery, and at 100mAhg -1 The first reversible specific capacity is 687.2mAh g under the current density -1 , after 100 cycles, the specific capacity is 518.3mAh g -1 ;

[0045] The above-mentioned preparation method of a lithium-doped high-entropy oxide battery negative electrode material comprises the following steps:

[0046] Step 1: Take Fe with a purity of 99% 2 o 3 (0.005mol, 0.8065g), ZnO (0.01mol, 0.822g), Cr 2 o 3 (0.005mol, 0.768g), NiO (0.01mol, 0.754g), MnO 2 (0.01mol, 0.878g) and Co 3 o 4 (0.0033mol, 0.803g) obtain material A after powder...

Embodiment 2

[0055] A lithium-doped high-entropy oxide battery negative electrode material, the chemical formula is (Li 1 / 6 Fe 1 / 6 co 1 / 6 Ni 1 / 6 Zn 1 / 6 mn 1 / 6 ) 3 o 4 ;

[0056] The particle size of the lithium-doped high-entropy oxide battery negative electrode material is 5-8 μm;

[0057] The negative electrode material of the lithium-doped high-entropy oxide battery is tested by the half-cell of the lithium-ion battery, and at 100mAhg -1 Under the current density, the first reversible specific capacity is 720.2mAhg -1 , after 100 cycles, the specific capacity is 604.6mAhg -1 ;

[0058] The above-mentioned preparation method of a lithium-doped high-entropy oxide battery negative electrode material comprises the following steps:

[0059] Step 1: Take Fe with a purity of 99% 2 o 3 (0.005mol, 0.8065g), ZnO (0.01mol, 0.822g), NiO (0.01mol, 0.754g), MnO 2 (0.01mol, 0.878g) and Co 3 o 4 (0.0033mol, 0.803g) obtain material A after powder mixing, and in A, add the Li that purity ...

Embodiment 3

[0068] A lithium-doped high-entropy oxide battery negative electrode material, the chemical formula is (Li 1 / 6 Zn 1 / 6 co 1 / 6 Ni 1 / 6 Cr 1 / 6 mn 1 / 6 ) 3 o 4 ;

[0069] The particle size of the lithium-doped high-entropy oxide battery negative electrode material is 3-5 μm;

[0070] The negative electrode material of the lithium-doped high-entropy oxide battery is tested by the half-cell of the lithium-ion battery, and at 100mAhg -1 Under the current density, the first reversible specific capacity is 545.9mAhg -1 , after 100 cycles, the specific capacity is 460.0mAhg -1 ;

[0071] The above-mentioned preparation method of a lithium-doped high-entropy oxide battery negative electrode material comprises the following steps:

[0072] Step 1: Take ZnO (0.01mol, 0.822g) with a purity of 99%, Cr 2 o 3 (0.005mol, 0.768g), NiO (0.01mol, 0.754g), MnO 2 (0.01mol, 0.878g) and Co 3 o 4 (0.0033mol, 0.803g) obtain material A after powder mixing, and in A, add the Li that purity i...

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Abstract

The invention discloses a lithium-doped high-entropy oxide battery negative electrode material as well as preparation and application methods thereof, belongs to the field of lithium ion battery materials, and aims to synthesize lithium-doped high-entropy oxide as a lithium battery negative electrode material through a high-temperature solid-phase method, so that the first discharge capacity of the electrode material is effectively improved through lithium doping, and the cycle stability of the material is improved by the entropy stabilization effect. The performance gain and effect generatedby the good synergistic effect are obviously superior to those generated by traditional element doping. The first reversible specific capacity of the battery negative electrode material is 400-720 mAhg<-1> under the current density of 100 mAhg<-1> in a lithium ion battery half-battery test, the specific capacity is 300-720 mAhg<-1> after 100 times of circulation, and the battery negative electrodematerial shows excellent electrochemical performance. The preparation method provided by the invention is simple in process, high in operability and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a lithium-doped high-entropy oxide battery negative electrode material and a preparation and application method thereof. Background technique [0002] Rechargeable lithium-ion batteries have the advantages of high energy density, fast charge and discharge speed, low self-discharge rate, and low cost, and have been widely used in portable electronic devices and electric vehicles. As one of the most important parts of lithium-ion batteries, anode materials have always been a key topic of research. So far, the commercial anode materials are still based on graphitic carbon materials. Graphite carbon materials have the advantages of excellent electrical conductivity, stable discharge potential, stable structure during charge and discharge, low price, and mature technology, making them still irreplaceable. However, this material also has a defect that cannot b...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/44H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/027C01P2004/03C01P2002/72C01P2006/40C01P2004/61Y02E60/10
Inventor 王志远田康辉刘延国王丹孙宏宇
Owner 东北大学秦皇岛分校
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