Method for preparing lithium battery positive electrode material based on in-situ composite and recombination

A positive electrode material and in-situ composite technology, which is applied in the direction of battery electrodes, lithium batteries, positive electrodes, etc., to achieve the effects of uniform and dense particle size distribution, improved conductivity, and stable voltage window

Active Publication Date: 2019-04-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the defects existing in the existing lithium-rich lithium battery positive electrode materials, the present invention provides a method for preparing lithium battery positive electrode materials based on in-situ bulk phase doping and recombination

Method used

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  • Method for preparing lithium battery positive electrode material based on in-situ composite and recombination
  • Method for preparing lithium battery positive electrode material based on in-situ composite and recombination
  • Method for preparing lithium battery positive electrode material based on in-situ composite and recombination

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Effect test

Embodiment 1

[0030] A method for preparing lithium battery cathode materials based on in-situ compounding and recombination, comprising the following steps:

[0031] (1) Mn-Co-Ni ternary composite lithium-rich manganese-based cathode material was prepared by co-precipitation method, and the selected raw material was MnSO 4 、CoSO 4 、NiSO 4 , the MnSO 4 、CoSO 4 and NiSO 4 The molar ratio is 4.2:1:1; and then stirred at a constant temperature in an oil bath at 80°C for 4 hours to form figure 2 The pink precipitate shown in (a); the washed and dried precursor was sintered at 850 °C for 24 hours in an air atmosphere, and finally a pure-phase LMR material was obtained. The microstructure of the sintered product is as follows figure 2 as shown in (b);

[0032] (2) Combine the pure-phase LMR prepared in step (1) with LiMnO 2 , Li 2S. Super-P is mixed by high-energy liquid phase ball milling, and acetone is selected as the medium. Under the condition of 600r / min, ball milling is carried o...

Embodiment 2

[0040] A method for preparing lithium battery cathode materials based on in-situ compounding and recombination, comprising the following steps:

[0041] (1) Mn-Co binary composite lithium-rich manganese-based cathode material was prepared by hydrothermal method, and the selected raw material was MnSO 4 、CoSO 4 , the MnSO 4 、CoSO 4 The molar ratio of the solution is 4:1, stirred at room temperature until it is completely dissolved, and the reaction solution is prepared; then the reaction solution is transferred to a 100ml reaction kettle liner, and placed in a 150°C oven at a constant temperature for 24 hours , to obtain a pink precipitate; the washed and dried precursor was first sintered at 400°C for 4 hours in an air atmosphere, and then heated to 800°C for 20 hours to obtain a pure-phase LMR material;

[0042] (2) The pure phase LMR and MnO obtained in step (1) 2 , MnCl 2 , Carbon black were pressed separately to make sputtering targets;

[0043] (3) Put the sputterin...

Embodiment 3

[0045] A method for preparing lithium battery cathode materials based on in-situ compounding and recombination, comprising the following steps:

[0046] (1) Mn-Ti binary composite lithium-rich manganese-based cathode material was prepared by co-precipitation method, and the selected raw material was MnSO 4 、Ti(SO4) 2 9H 2 O, the MnSO 4 、Ti(SO4) 2 9H 2 The molar ratio of O was 5:2; then stirred at a constant temperature in an oil bath at 70°C for 3 hours; the washed and dried precursor was sintered at 850°C for 24 hours in an air atmosphere, and finally a pure-phase LMR material was obtained;

[0047] (2) Combine the pure-phase LMR prepared in step (1) with MnO 2 , Li 2 S. The asphalt is mixed by high-energy liquid phase ball milling, and acetone is selected as the medium. Under the condition of 700r / min, the ball milling is carried out for 20 hours, the mixture obtained after ball milling is collected, and the primary target is prepared by a tablet press;

[0048] (3) P...

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Abstract

The invention relates to a method for preparing a lithium battery positive electrode material based on in-situ composite and recombination, which belongs to the technical field of lithium battery positive electrode preparation. The method adopts a sputtering process to recombine and grow a pure-phase lithium-rich positive electrode material and a doping substance on a base to obtain a material serving as a lithium battery positive electrode, wherein the doping substance comprises any one or more of a conductive agent, a substance providing anion doping and a substance providing cation protection. The composite film prepared by adopting the method has the advantages of high purity, good crystallinity, stable structure, low catalytic activity of the surface of the material, can be directly used as the lithium battery positive electrode material, significantly improves the electrical conductivity and the coulombic efficiency of the material, stabilizes the voltage window, and protects thecatalytic decomposition of an electrolyte; and the process of the invention realizes one-step electrode plate forming, can avoid the cumbersome slurry and electrode plate preparation process, and simplifies the operation process while improving the material performance. The method disclosed by the invention has the advantages of clean and environmentally-friendly process, simple operation, low cost and high experimental repetition rate, and is favorable for realizing large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium battery positive electrode preparation, and in particular relates to a method for preparing lithium battery positive electrode materials based on in-situ compounding and recombination. Background technique [0002] Due to the advantages of high voltage, high specific energy, wide operating temperature range, high specific power, and stable discharge, lithium batteries are widely used in various electronic products or devices. However, as the market requirements become higher and higher, it is necessary to find new Electrode materials to meet the growing demand for energy storage. [0003] Cathode material is a key factor in determining lithium batteries, so the development of new high specific energy cathode materials has become the key to improving the performance of lithium batteries. The problems of lithium-rich lithium battery cathode materials are as follows: poor conductivity; catalytic dec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/052H01M4/04C23C14/14C23C14/34
CPCH01M4/0426H01M4/364H01M4/366H01M4/624H01M4/625H01M4/628H01M10/052C23C14/14C23C14/34H01M2004/028H01M2004/021Y02E60/10
Inventor 吴孟强杨俭徐自强廖家轩冯婷婷史奇玉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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