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Preparation method of a hollow tubular lithium-rich manganese-based positive electrode material

A lithium-rich manganese-based, cathode material technology, used in battery electrodes, structural parts, electrochemical generators, etc., can solve the problems of cumbersome particle collection process and inability to meet industrial production requirements.

Active Publication Date: 2020-10-23
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to introduce templates during preparation, the process of collecting particles is cumbersome, so it cannot meet the requirements of industrial production

Method used

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  • Preparation method of a hollow tubular lithium-rich manganese-based positive electrode material
  • Preparation method of a hollow tubular lithium-rich manganese-based positive electrode material
  • Preparation method of a hollow tubular lithium-rich manganese-based positive electrode material

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Embodiment 1

[0039] A method for preparing a hollow tubular lithium-rich manganese-based positive electrode material, the lithium-rich manganese-based positive electrode material contains Li, Mn, Ni, Co and O elements, and its molecular formula is Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 .

[0040] The preparation method of the above-mentioned lithium-rich manganese-based positive electrode material specifically includes the following steps:

[0041] 1) Dissolve 4g of polymethyl methacrylate in 10mL of N,N-dimethylformamide, stir and dissolve in a water bath at 50°C to obtain spinning solution A;

[0042] 2) Dissolve 2g of polyacrylonitrile in 10mL of N,N-dimethylformamide, stir and dissolve at room temperature, and dissolve soluble 1.2855g of lithium acetate, 1.3235g of manganese acetate, 0.3235g of nickel acetate and 0.3238g of cobalt acetate in In N,N-dimethylformamide, after the two solutions are mixed, spinning solution B is obtained;

[0043] 3) Adopt the coaxial electrospinning proc...

Embodiment 2

[0059] A method for preparing a hollow tubular lithium-rich manganese-based positive electrode material, the lithium-rich manganese-based positive electrode material contains Li, Mn, Ni, Co and O elements, and its molecular formula is Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 .

[0060] The preparation method of the above-mentioned lithium-rich manganese-based positive electrode material specifically includes the following steps:

[0061] 1) Dissolve 4g of polymethyl methacrylate in 10mL of N,N-dimethylformamide, stir and dissolve in a water bath at 50°C to obtain spinning solution A;

[0062] 2) Dissolve 2g of polyacrylonitrile in 10mL of N,N-dimethylformamide, stir and dissolve at room temperature, and dissolve soluble 1.2855g of lithium acetate, 1.3235g of manganese acetate, 0.3235g of nickel acetate and 0.3238g of cobalt acetate in In N,N-dimethylformamide, after the two solutions are mixed, spinning solution B is obtained;

[0063] 3) Adopt the coaxial electrospinning proc...

Embodiment 3

[0066] A method for preparing a hollow tubular lithium-rich manganese-based positive electrode material, the lithium-rich manganese-based positive electrode material contains Li, Mn, Ni, Co and O elements, and its molecular formula is Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 .

[0067] The preparation method of the above-mentioned lithium-rich manganese-based positive electrode material specifically includes the following steps:

[0068] 1) Dissolve 2g of polymethyl methacrylate in 10mL of N,N-dimethylformamide, stir and dissolve in a water bath at 50°C to obtain spinning solution A;

[0069] 2) Dissolve 2g of polyacrylonitrile in 10mL of N,N-dimethylformamide, stir and dissolve at room temperature, and dissolve soluble 1.2855g of lithium acetate, 1.3235g of manganese acetate, 0.3235g of nickel acetate and 0.3238g of cobalt acetate in In the organic solvent, after the two solutions are mixed, the spinning solution B is obtained;

[0070] 3) Adopt the coaxial electrospinning pr...

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Abstract

The invention relates to a preparation method of a hollow tubular lithium-rich manganese-based positive electrode material. The preparation method includes the steps of (1), dissolving high-molecularpolymer A in an organic solvent to obtain spinning solution A; (2), dissolving lithium precursor, manganese salt, nickel salt and cobalt salt respectively obtain metal salt solution, dissolving high-molecular polymer B in an organic solvent to obtain a polymer solution, mixing the metal salt solution with the polymer solution uniformly to obtain spinning solution B; (3), taking the spinning solution A as an inner axle and the spinning solution B as an external axle, performing an co-axial electrospinning process to obtain nano-fiber; (4), drying the nano-fiber, calcining the nano-fiber at different stages, and then cooling to obtain a product. Compared with the prior art, the material synthesized by the method for preparing the hollow tubular lithium-rich manganese-based positive electrodematerial through the co-axial electrospinning process has the advantages of accurate stoichiometric ratio, uniform particle dispersion and the like, and also has excellent cycle performance.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and relates to a method for preparing a hollow tubular lithium-rich manganese-based positive electrode material. Background technique [0002] Lithium-ion battery cathode material since the first commercial LiCoO 2 Since then, the actual capacity that can be used is only 50% of its theoretical capacity (140mAh / g). After continuous exploration by scientific researchers, the lithium-rich manganese-based cathode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 The theoretical specific capacity is greater than 250mAh / g, and the energy density is greater than 300Wh / kg. Due to its good thermal stability, wide charge-discharge voltage range, low price, and environmental friendliness, it has become the most promising next-generation cathode material. [0003] At present, the synthesis methods of lithium-rich manganese-based cathode materials mainly include ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525D01D5/00D01D5/30B82Y40/00
CPCB82Y40/00D01D5/003D01D5/0092D01D5/30H01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 徐群杰朱庆鹏闵宇霖范金辰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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