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A kind of preparation method of high tap density composite cathode material

A composite positive electrode material and tap density technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of difficulty in ensuring the stability and consistency of materials, difficulty in target template manganese carbonate, unfavorable production, etc., to achieve Improved discharge specific capacity and coulombic efficiency, improved rate characteristics, and low cost effects

Active Publication Date: 2017-03-01
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is the need to prepare a "manganese carbonate template", first of all, the Mn compound needs to be dissolved and then converted to MnCO again 3 , which increases the cost; secondly, the preparation of the target template manganese carbonate with special structure is difficult, so the stability of the material and the consistency in the production process are difficult to guarantee, which is not conducive to industrial production

Method used

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  • A kind of preparation method of high tap density composite cathode material
  • A kind of preparation method of high tap density composite cathode material
  • A kind of preparation method of high tap density composite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First press the molecular formula 0.5LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 -0.5Li 2 MnO 3 The stoichiometric ratio of Mn, Ni, Co to prepare MnSO 4 , NiSO 4 , CoSO 4 The mixed solution, the cation concentration is 2.0mol / L, and then press 0.5LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 -0.5Li 2 MnO 3 -0.3MnO 2 Medium MnO 2 Add MnO to the stoichiometric ratio 2 Powder, forming a suspension;

[0036] Then prepare Na 2 CO 3 And NH 3 ·H 2 Mixed solution of O, Na 2 CO 3 The concentration is 2.0mol / L, NH 3 ·H 2 The O concentration is 0.24mol / L;

[0037] Use a peristaltic pump to drop the above two solutions into the reaction vessel, and control the pH value to be around 7.5. The water bath is heated at 50°C and contains MnO. 2 The volume ratio of the suspension to the lye is 1:1.1, and the reaction is 24h. After the reaction is completed, suction filtration, washing, and drying in a vacuum oven at 120°C for 12 hours to obtain MCO 3 -MnO 2 Compound (M=Mn, Ni, Co);

[0038] MCO 3 -MnO 2 The compound and 0.38LiCl-0...

Embodiment 2

[0042] First press the molecular formula 0.5LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 -0.5Li 2 MnO 3 The stoichiometric ratio of Mn, Ni, Co to prepare MnSO 4 , NiSO 4 , CoSO 4 The mixed solution, the cation concentration is 2.0mol / L, and then press 0.5LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 -0.5Li 2 MnO 3 -0.3MnO 2 Medium MnO 2 Add MnO to the stoichiometric ratio 2 Powder, forming a suspension;

[0043] Prepare Na 2 CO 3 And NH 3 ·H 2 Mixed solution of O, Na 2 CO 3 The concentration is 2.0mol / L, NH 3 ·H 2 The O concentration is 0.24mol / L;

[0044] Use a peristaltic pump to drop the above two solutions into the reaction vessel, and control the pH value to be around 7.5. The water bath is heated at 50°C and contains MnO. 2 The volume ratio of the suspension to the lye is 1:1.1, and the reaction is 24h. After the reaction is completed, suction filtration, washing, and drying in a vacuum oven at 120°C for 12 hours to obtain MCO 3 -MnO 2 Compound (M=Mn, Ni, Co);

[0045] MCO 3 -MnO 2 Complex with 0.6LiNO 3 -0.4LiOH ...

Embodiment 3

[0047] First press the molecular formula 0.5LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 -0.5Li 2 MnO 3 The stoichiometric ratio of Mn, Ni, Co to prepare MnSO 4 , NiSO 4 , CoSO 4 The mixed solution, the cation concentration is 2.0mol / L, and then press 0.5LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 -0.5Li 2 MnO 3 -0.3MnO 2 Medium MnO 2 Add MnO to the stoichiometric ratio 2 Powder, forming a suspension;

[0048] Prepare Na 2 CO 3 And NH 3 ·H 2 Mixed solution of O, Na 2 CO 3 The concentration is 2.0mol / L, NH 3 ·H 2 The O concentration is 0.24mol / L;

[0049] Use a peristaltic pump to drop the above two solutions into the reaction vessel, and control the pH value to be around 7.5. The water bath is heated at 50°C and contains MnO. 2 The volume ratio of the suspension to the lye is 1:1.1, and the reaction is 24h. After the reaction is completed, suction filtration, washing, and drying in a vacuum oven at 120°C for 12 hours to obtain MCO 3 -MnO 2 Compound (M=Mn, Ni, Co);

[0050] MCO 3 -MnO 2 Complex with 0.3LiCl-0.7LiNO 3 A...

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Abstract

The invention discloses a preparation method of a composite cathode material with high tap density. The preparation method comprises the following steps: 1) complexes of a nickel-containing precursor and MnO2 are synthesized by a coprecipitation method, wherein the nickel-containing precursor is an insoluble mixture formed by insoluble Ni salt, or Ni and at least one element selected from Co, Mn and Al; and 2) after the complexes of the nickel-containing precursor and MnO2 is mixed with a compounded lithium source, heat treatment is carried out to obtain the composite cathode material with high tap density, wherein the compounded lithium source is a low-temperature eutectic mixture formed by two lithium compounds. The technology provided by the invention is simple and suitable for large-scale production. By the technology, tap density of the cathode material can be obviously raised, and introduction of hetero-ion will not be caused. According to the invention, various electrical properties of the composite cathode material can be comprehensively enhanced. First specific discharge capacity and coulombic efficiency of the material are improved, and cycle performance and rate capability are simultaneously improved. Uniform distribution of MnO2 in the cathode material can be realized, and a real sense of ''composite'' is realized.

Description

Technical field [0001] The invention relates to a method for preparing a high tap density composite positive electrode material, and belongs to the technical field of lithium ion battery positive electrode materials. Background technique [0002] Lithium-ion batteries are the main power source for portable electronic products such as mobile phones and notebook computers. High capacity and good cycle performance are basic requirements for them. Batteries used in portable electric tools and electric vehicles also require high-capacity storage density and reliable safety. [0003] Lithium Cobalt Oxide (LiCoO 2 Since the material was discovered by American scholar J.B. Goodenough and others in the 1980s, it has received extensive attention and is currently widely used as a cathode material for lithium-ion batteries. With the development of high-capacity lithium-ion batteries and power-type lithium-ion batteries for electronic products, positive electrode materials are required to have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/50
CPCH01M4/362H01M4/502H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 柏祥涛庄卫东孙学义沈雪玲张超卢世刚
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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