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Metal oxide energy storage material with special microstructure and preparation method

A technology of microstructure and energy storage materials, applied in the field of materials, can solve the problems of limiting the potential of industrial applications, complicated preparation processes, and consumption of lithium sources, so as to improve high-rate working performance, high cycle stability, and reduce grain boundaries The effect of resistance

Pending Publication Date: 2020-12-22
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods have been proven to improve the performance of electrode materials, but this optimization method is relatively difficult to control, time-consuming, labor-intensive, and costly under industrial-grade preparation conditions, which greatly limits its potential for industrial applications.
[0005] Metal oxides have the potential to prepare high-performance electrodes, but there are still several problems: (1) the material charge-discharge reversible specific capacity is small; (2) the solid electrolyte interface (SEI) is unstable during charge-discharge cycles, resulting in the consumption of lithium (3) The performance of the material is unstable during charging and discharging; (4) The electronic conductivity and ion conductivity of the material cannot achieve high-rate working performance; (5) The preparation process is complicated, the cost is high, and there is pollution

Method used

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  • Metal oxide energy storage material with special microstructure and preparation method
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  • Metal oxide energy storage material with special microstructure and preparation method

Examples

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Embodiment 1

[0024] SrCa synthesized by sol-gel method 1 / 3 Nb 2 / 3 o 3 Add 2 times the molar ratio of hydrochloric acid aqueous solution to the precursor, keep stirring at 80°C for two days, filter the particles, add 2 times the molar ratio of hydrochloric acid aqueous solution, and place the mixed system in a high-temperature and high-pressure reaction vessel, and react at 130°C After three days, filter the particles, and finally add an aqueous hydrochloric acid solution with a molar ratio of 2 times, and place the mixed system in a high-temperature and high-pressure reaction vessel, and react at 160°C for three days to obtain an intermediate product. During the reaction, all the strontium ions, calcium ions and part of the niobium ions in the raw materials were dissolved by the hydrochloric acid solution, and the hydrogen ions in the hydrochloric acid solution were exchanged into the crystal structure. After the reaction was completed, the precipitate was separated by filtration under re...

Embodiment 2

[0026] LiNbO synthesized by sol-gel method 3 Add 3 times the molar ratio of hydrochloric acid aqueous solution, stir at 80°C and keep warm for two days, filter the particles, add 3 times the molar ratio of hydrochloric acid aqueous solution, and place the mixed system in a high-temperature and high-pressure reaction vessel, and react at 110°C for three One day, filter the particles, and finally add a 3-fold molar ratio of hydrochloric acid aqueous solution, and place the mixed system in a high-temperature and high-pressure reaction vessel, and react at 150°C for three days to obtain an intermediate product. During the reaction, all the lithium ions and part of the niobium ions in the raw material are dissolved by the hydrochloric acid solution, and the hydrogen ions in the hydrochloric acid solution are exchanged into the crystal structure. After the reaction is completed, the precipitate is separated by filtration under reduced pressure, and the white intermediate product is n...

Embodiment 3

[0028] SrMoO synthesized by sol-gel method 4 Add 5 times the molar ratio of hydrochloric acid aqueous solution, stir at 80°C and keep warm for two days, filter the particles, add 5 times the molar ratio of hydrochloric acid aqueous solution, and place the mixed system in a high temperature and high pressure reaction vessel, and react at 110°C for three One day, filter the particles, and finally add a 5-fold molar ratio of hydrochloric acid aqueous solution, and place the mixed system in a high-temperature and high-pressure reaction vessel, and react at 200°C for three days to obtain an intermediate product. During the reaction, all the strontium ions and part of the molybdenum ions in the raw materials are dissolved by the hydrochloric acid solution, and after the reaction is completed, the precipitates are separated by filtration under reduced pressure, and the white intermediate product is molybdenum oxide particles with an amorphous structure. The prepared particles were ca...

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Abstract

The invention relates to a metal oxide material with a special microstructure for electrochemical energy storage and a preparation method thereof, and the microstructure of the metal oxide material ischaracterized in that the metal oxide material is of a single crystal, quasi-single crystal or twin crystal structure, has a defect and porous structure and contains mixed valence metal elements. Thestructural general formula is MxOy-z. The method can be used for solving the problem of insufficient performance of an electrochemical energy storage negative electrode material under a high-rate working condition. On one hand, the existence of mixed valence metal elements greatly increases the electronic conductivity of the material; on the other hand, due to the existence of the defects and thepores, the ion transport property and the electrochemical activity of the material are improved, more lithium storage sites appear, and buffer can also be provided for the volume change of the electrode; and the special microstructure provides guarantee for high power, high energy and high stability of the material. The metal oxide provided by the invention can be used as an electrode material ofan energy storage device in the fields of electric vehicles and the like requiring high power density and high-stability energy storage.

Description

technical field [0001] The invention relates to an electrochemical energy storage material, in particular to a metal oxide material with a special microstructure and a preparation method thereof, belonging to the field of materials. Background technique [0002] With the energy crisis sweeping the world, the pollution and non-renewability of traditional fossil energy have been widely recognized and valued by the world. In this context, electrochemical energy storage technology has received extensive attention from industry and academia, and has made great progress. Lithium-ion batteries and supercapacitors are the latest technologies in the field of electrochemical energy storage. In 1989, Japan's SONY company first proposed LiCoO 2 As Li source positive electrode, petroleum coke as negative electrode, LiPF 6 Dissolved in propylene carbonate and ethylene carbonate as the electrolyte, a new type of lithium-ion battery was developed and successfully commercialized in 1991. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/18H01G11/46H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525
CPCC01B13/18H01M4/483H01M4/485H01M4/502H01M4/505H01M4/523H01M4/525H01G11/46C01P2004/04C01P2006/40Y02E60/10
Inventor 黄富强刘子超董武杰
Owner PEKING UNIV
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