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A kind of spherical vanadium bronze coil sodium ion battery cathode material and preparation method thereof

A technology for sodium ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of rate performance and cycle performance that cannot meet the requirements of use, short cycle life, poor rate performance, etc. The effect of migration distance, increased stability, and not easy to fall off

Active Publication Date: 2020-11-03
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when vanadium pentoxide is applied to the positive electrode material of sodium ion battery, the rate performance is poor and the cycle life is short, which limits its application in sodium ion battery; and, the vanadium bronze material and vanadate compound with three-dimensional framework structure, As a cathode material for sodium-ion batteries, it shows good electrochemical performance, but the rate performance and cycle performance still cannot meet the requirements of use.

Method used

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  • A kind of spherical vanadium bronze coil sodium ion battery cathode material and preparation method thereof
  • A kind of spherical vanadium bronze coil sodium ion battery cathode material and preparation method thereof
  • A kind of spherical vanadium bronze coil sodium ion battery cathode material and preparation method thereof

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Embodiment 1

[0050] A positive electrode material for a sodium ion battery is composed of vanadium bronze coils, the vanadium bronze coils have a hierarchical porous spherical structure, the diameter of the vanadium bronze coils is 1-5 μm, and the vanadium bronze coils are composed of interwoven nanotubes.

[0051] In order to further optimize the technical scheme, the pore size distribution of the vanadium bronze coils is 3.3nm, 19nm and 40nm, and the specific surface area of ​​the vanadium bronze coils is 12.5m 2 / g.

[0052] In order to further optimize the technical solution, the length of the nanotube is 0.3-2 μm.

[0053] In order to further optimize the technical solution, the length of the nanotube is 0.3-2 μm.

[0054] In order to further optimize the technical solution, the inner diameter of the nanotube is 3nm, and the thickness of the tube wall is 7nm.

Embodiment 2

[0056] A preparation method of a sodium ion battery cathode material, specifically comprising the steps of:

[0057] (1) Preparation of vanadium oxide precursor:

[0058] (a) Weigh vanadium pentoxide and straight-chain organic amine respectively according to the molar ratio of 1: (3~5), and weigh vanadium pentoxide and H 2 o 2 The mass ratio of the solution is 1:(18~43) Weigh the H 2 o 2 solution, set aside; then slowly drop H into the vanadium pentoxide 2 o 2 solution, stir evenly, and then slowly add linear organic amine;

[0059] (b) After fully stirring for 5 hours, put the obtained solution into a reaction kettle lined with polytetrafluoroethylene, and react at 160-250°C for 3-7d;

[0060] (c) Centrifuge the reacted product first, then wash with deionized water and alcohol three times in sequence, and finally vacuum-dry at 60-120° C. for 10-12 hours to obtain a vanadium oxide precursor containing organic amine molecular intercalation.

[0061] (2) Preparation of so...

Embodiment 3

[0076] A preparation method of a sodium ion battery cathode material, specifically comprising the steps of:

[0077] (1) Preparation of vanadium oxide precursor:

[0078] (a) take by weighing 1.82g of vanadium pentoxide in a beaker, then weigh 55.50g of 30% H 2 o 2 The solution was dripped into a beaker filled with alum pentoxide, stirred for 2 hours to form a uniform solution; then slowly added 7.42g of dodecylamine;

[0079] (b) After fully stirring for 5 hours, put the obtained solution into a reaction kettle lined with polytetrafluoroethylene, and react at 200° C. for 5 days;

[0080] (c) Centrifuge the reacted product first, then wash with deionized water and alcohol three times in sequence, and finally vacuum-dry at 80° C. for 10-12 hours to obtain a vanadium oxide precursor containing organic amine molecular intercalation.

[0081] (2) Preparation of sodium-doped vanadium bronze precursor:

[0082] (A) Weigh 2.13g of sodium sulfate and 0.91g of vanadium oxide precur...

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Abstract

The invention discloses a sodium ion battery positive electrode material. The sodium ion battery positive electrode material consists of a vanadium bronze wire ball; the vanadium bronze wire ball adopts a hierarchical porous spheroid structure, has the diameter of 1 to 5 um and is formed by interweaving nanotubes; due to the unique hierarchical porous structure, the sodium ion diffusion coefficient of the vanadium bronze material is increased and the rate performance of the vanadium bronze material is greatly improved; furthermore, expansion and shrinkage of the material volume can be retardedand the integrity of the electrode is maintained; and the stability of the battery capacity is guaranteed, so that the cycle performance is improved. Meanwhile, the preparation method provided by theinvention is simple and efficient; a vanadium oxide precursor is prepared by an organic template method, and the spheroid vanadium bronze wire ball with the hierarchical porous structure can be obtained through hydrothermal reaction and calcination reaction; and the integral preparation method is high in repeatability and has actual application value.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a spherical-like vanadium bronze coil sodium-ion battery cathode material and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries, as an important chemical energy storage system, have been widely used as mobile power sources for portable electronic and electrical equipment, bringing convenience to people. However, with the large-scale use of lithium-ion batteries, the over-exploitation of lithium salt resources and the shortage of lithium ore resources have further inhibited the long-term development and utilization of lithium-ion batteries. Therefore, it is urgent to find a large-scale energy storage system that can replace lithium-ion batteries. Sodium-ion batteries have similar electrochemical properties to lithium-ion batteries, and because their raw materials are resource-rich sodium salts, they can be used as large-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00H01M4/58H01M10/054
CPCC01G31/00C01P2002/72C01P2004/03C01P2004/04C01P2004/32C01P2004/61C01P2006/17H01M4/5825H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 李朝晖宋学霞李继成肖启振雷钢铁
Owner XIANGTAN UNIV
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