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Method for synthesizing lithium metal oxide positive electrode material by employing metal fluoride fluxing agent prepared with plasma fluorination method

A lithium metal oxide and cathode material technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of poor cycle and rate performance, high production cost, and complicated operation, so as to improve rate performance and inhibit The effect of ion mixing and simple operation

Active Publication Date: 2016-09-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a metal fluoride auxiliary prepared by plasma fluorination to solve the problems of poor cycle and rate performance, high production cost and complicated operation of traditional modification methods commonly found in lithium metal oxide cathode materials. Flux synthesis method for lithium metal oxide cathode material

Method used

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  • Method for synthesizing lithium metal oxide positive electrode material by employing metal fluoride fluxing agent prepared with plasma fluorination method
  • Method for synthesizing lithium metal oxide positive electrode material by employing metal fluoride fluxing agent prepared with plasma fluorination method
  • Method for synthesizing lithium metal oxide positive electrode material by employing metal fluoride fluxing agent prepared with plasma fluorination method

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specific Embodiment approach 1

[0033] Specific Embodiment 1: The method for synthesizing lithium metal oxide positive electrode materials using the metal fluoride flux prepared by the plasma fluorination method in this embodiment is carried out according to the following steps:

[0034] 1. Dissolve the lithium metal oxide precursor material and the flux precursor in an organic solvent at a molar ratio of 1: (0.001-0.2), stir at 60°C-200°C, and evaporate the solvent to dryness to form surface adhesion The lithium metal oxide precursor material A of the flux precursor; the chemical formula of the lithium metal oxide precursor material is Ni x co y mn z m 1-x-y-z (OH) 2 or Ni x co y mn z m 1-x-y-z CO 3 , where 0≤x≤1, 0≤y≤1, 0≤z≤1, x+y+z≤1, M is Zr, Fe, Sm, Pr, Nb, Ga, Zn, Y, Mg, Al, One or more of Cr, Ca, Ti, Cu, Sr, Mo, Ce, Sn, Sb.

[0035] 2. Put material A into a plasma etching machine, use fluorine-containing gas for surface treatment, and prepare lithium metal oxide precursor material B with met...

specific Embodiment approach 2

[0037] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the flux precursor described in step one is sodium silicate, potassium silicate, tungsten silicate, lead silicate, bismuth silicate, barium silicate one or a mixture of several. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0038] Embodiment 3: This embodiment is different from Embodiment 1 in that the organic solvent in Step 1 is one or a mixture of alcohols, aromatic hydrocarbons, ethers, and ketones. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention discloses a method for synthesizing a lithium metal oxide positive electrode material by employing a metal fluoride fluxing agent prepared with a plasma fluorination method. The invention belongs to the technical field of the lithium ion battery positive electrode material and electrochemistry, and particularly relates to the method for synthesizing the lithium metal oxide positive electrode material by employing the metal fluoride fluxing agent prepared with the plasma fluorination method. The invention aims to solve the problem that the lithium metal oxide positive electrode material commonly has poor cycling and rate performance, high production cost, and complex operation of the traditional modification method. The method disclosed by the invention comprises the steps of forming the metal fluoride fluxing agent with a co-doping effect on the surface of a lithium metal oxide precursor by employing the plasma fluorination method, and mixing and sintering the fluxing agent and a lithium source solid phase to obtain the lithium metal oxide positive electrode material. The high-efficiency energy-saving positive electrode material disclosed by the invention is used in a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials and electrochemistry, and in particular relates to a method for synthesizing lithium metal oxide cathode materials using a metal fluoride flux prepared by a plasma fluorination method. Background technique [0002] In the innovation and progress of lithium-ion batteries, the application of new electrode materials has played a vital role. In the past 20 years of development, the overall performance of lithium-ion batteries has been improved mainly due to the improvement of negative electrode materials. Lithium-ion battery anode materials have experienced three development stages of soft carbon, hard carbon and graphitized carbon materials, and their specific capacity has exceeded 300mAh g -1 . Compared with negative electrode materials, positive electrode materials have a greater impact on the specific energy of lithium-ion batteries. However, the specific capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杜春雨陈诚尹鸽平耿天凤贺晓书徐星左朋建程新群马玉林高云智
Owner HARBIN INST OF TECH
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