Preparation method and application of cobalt-free positive electrode precursor material of lithium ion battery

A technology for lithium-ion batteries and lithium-rich cathode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., to avoid local segregation and reduce costs.

Active Publication Date: 2022-06-03
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, lithium-rich manganese-based cathode materials are highly dependent on cobalt, and it is of great significance to explore how to make lithium-rich manganese-based cathode materials cobalt-free while maintaining high specific discharge capacity.

Method used

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  • Preparation method and application of cobalt-free positive electrode precursor material of lithium ion battery
  • Preparation method and application of cobalt-free positive electrode precursor material of lithium ion battery
  • Preparation method and application of cobalt-free positive electrode precursor material of lithium ion battery

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Effect test

Embodiment 1

[0032] Manganese sulfate monohydrate (256.12g) and nickel sulfate hexahydrate (133.44g) whose molar ratio is Mn:Ni=3:1 are dissolved in deionized water to prepare a mixed metal salt solution of 1mol / L; sodium carbonate ( 212g) was dissolved in deionized water to prepare a 1 mol / L precipitant solution; sodium tartrate (4g) was dissolved in deionized water to prepare a complexing agent solution. Add the mixing of dilute sulfuric acid and tartaric acid to adjust the initial reaction solution pH to be 3.0, drop the prepared metal salt solution and precipitant solution into the reactor (10L) containing the complexing agent solution and deionized water (4L), stir The pump speed was 800 rpm / min, the reaction temperature was 60 °C, and the co-precipitation reaction was completed and then aged for 6 h. The precipitate was filtered and washed for 3 times, and then vacuum-dried at 60 °C for 24 h to obtain the precursor material. The dried precursor material was pre-calcined at 500 °C fo...

Embodiment 2

[0038] Dissolve manganese sulfate monohydrate (255.47g), nickel sulfate hexahydrate (133.42g), and ferrous sulfate heptahydrate (2.17g) with a molar ratio of Mn:Ni:Fe=197:65:1 in deionized water to prepare into a 1mol / L mixed metal salt solution; dissolving sodium carbonate (212g) in deionized water to prepare a 1mol / L precipitant solution; dissolving sodium tartrate (4g) in deionized water to prepare a complexing agent solution . Adding sulfuric acid or tartaric acid to adjust the initial reaction solution pH is 3.27, the prepared metal salt solution and the precipitant solution are dropped into the reactor (10L) equipped with the complexing agent solution, the stirring pump speed is 750rpm / min, and the reaction temperature is At 60°C, the co-precipitation reaction was completed and then aged for 5h. The precipitate was filtered and washed for 3 times, and then vacuum-dried at 60 °C for 24 h to obtain the precursor material. The dried precursor material was pre-calcined at ...

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Abstract

The invention discloses a preparation method and application of a lithium ion battery cobalt-free positive electrode precursor material, and the preparation method comprises the following steps: (1) uniformly mixing soluble metal salt and deionized water to obtain a metal salt solution; (2) uniformly mixing a complexing agent and deionized water to obtain a complexing agent solution; (3) uniformly mixing a precipitant and deionized water to obtain a precipitant solution; (4) slowly pumping the metal salt solution and the precipitant solution into the complexing agent solution under the protection of nitrogen or inert gas, stirring and mixing, and carrying out a co-precipitation reaction to obtain a precipitate; and (5) performing aging, filtering, washing and vacuum drying on the precipitate obtained in the step (4) in sequence to obtain the cobalt-free lithium-rich positive electrode precursor material. The method is simple, mild and environment-friendly, can greatly reduce the cost, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method and application of a cobalt-free positive electrode precursor material for lithium ion batteries. Background technique [0002] At present, lithium-ion batteries have become an indispensable and important part of human production and life. With the continuous development of society and the wide application of lithium-ion batteries, the raw material resources of battery electrodes have become scarce. Therefore, it is urgent to develop cathode materials for lithium-ion batteries with high abundance elements, low cost and high performance. At present, the production of cathode materials needs to consume a large amount of metal salts of Mn, Ni and Co. Among all the raw materials, cobalt has received a lot of attention due to its small reserves, high price and unfriendly environment. my country's cobalt reserves are scarce, accounting f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01G53/44H01M4/505H01M4/525H01M10/0525H01M2004/028C01P2004/03C01P2002/72C01P2006/40C01P2004/32C01P2004/45Y02E60/10
Inventor 谢清水彭栋梁范孟健罗晴张晨莺王来森
Owner XIAMEN UNIV
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