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Spinel nickel manganese acid lithium and layered lithium-rich manganese-based composite cathode material with core-shell structure and preparation method thereof

A composite positive electrode material, lithium nickel manganese oxide technology, applied in the direction of structural parts, battery electrodes, electrical components, etc., can solve the problems of fast capacity decay, poor high-rate performance, and low conductivity of lithium-rich manganese-based positive electrode materials. Reliable performance improvement, improved material circulation, and improved material structure stability

Active Publication Date: 2014-11-19
南京时拓能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-rich manganese-based cathode materials have low electrical conductivity, poor high-current discharge and high-rate performance, and rapid capacity decay during cycling. These shortcomings have become technical bottlenecks that limit the application of lithium-rich manganese-based cathode materials.

Method used

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  • Spinel nickel manganese acid lithium and layered lithium-rich manganese-based composite cathode material with core-shell structure and preparation method thereof
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  • Spinel nickel manganese acid lithium and layered lithium-rich manganese-based composite cathode material with core-shell structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Weigh nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio Ni: Co: Mn = 0.17: 0.17: 0.66, dissolve them in deionized water and mix them evenly, and use the co-precipitation method to complex the precipitant sodium hydroxide with a certain amount Ammonia solution was added dropwise, the molar ratio of metal salt and sodium hydroxide was controlled to be 1:1, and the molar ratio of metal salt and ammonia water was 1:0.75 at the same time. Turn / minute is constantly stirred, obtains lithium-rich manganese-based material precursor (Ni 0.17 co 0.17 mn 0.66 )(OH) 2 Mother liquor;

[0034] Weigh nickel sulfate and manganese sulfate according to the molar ratio Ni:Mn=0.25:0.75, dissolve them in deionized water and mix evenly, and use the co-precipitation method to drop the precipitant sodium hydroxide and a certain amount of complexing agent ammonia into the lithium-rich Manganese-based material precursor (Ni 0.17 co 0.17 mn 0.66 )(OH) 2 In ...

Embodiment 2

[0038] According to the molar ratio Ni: Co: Mn=0.17: 0.17: 0.66, the molar ratio of nickel sulfate and nickel oxalate is 1: 1 mixture, the molar ratio of cobalt sulfate and cobalt oxalate is 1: 1 mixture, and the molar ratio of manganese sulfate and manganese oxalate is 1:1 mixture, and dissolved in deionized water and mixed evenly, the precipitant sodium carbonate and a certain amount of complexing agent ammonia were added dropwise by the method of co-precipitation, and the molar ratio of metal salt and sodium carbonate was controlled to be 1:1, and at the same time The molar ratio of metal salt to ammonia water is 1:0.5, the pH value of the reaction is 7.5, and the reaction is carried out at 60° C. for 10 h, and the speed is 700 revolutions per minute under continuous stirring to obtain the lithium-rich manganese-based material precursor (Ni 0.17 co 0.17 mn 0.66 )CO 3 Mother liquor;

[0039] According to the molar ratio Ni:Mn=0.25:0.75, weigh the mixture of nickel sulfate...

Embodiment 3

[0043] Weigh nickel oxalate and manganese oxalate according to the molar ratio Ni:Mn=0.25:0.75, dissolve them in deionized water and mix them evenly, and add the precipitating agent sodium hydroxide and a certain amount of complexing agent ammonia water dropwise by co-precipitation method, The molar ratio of control and sodium hydroxide is 1:1, while the molar ratio of metal salt metal salt to ammonia water is 1:0.75, the pH value of the reaction is 10.5, react at 60°C for 12h, and continuously stir at a speed of 800 rpm to obtain Lithium-rich manganese-based material precursor core-(Ni 0.25 mn 0.75 )(OH) 2 Mother liquor;

[0044] Weigh nickel oxalate and manganese oxalate according to the molar ratio Ni:Mn=0.25:0.75, dissolve them in deionized water and mix evenly, and use the co-precipitation method to drop the precipitating agent sodium hydroxide and a certain amount of complexing agent ammonia water into the lithium-rich Manganese-based material precursor (Ni 0.25 mn ...

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Abstract

The invention relates to a spinel nickel manganese acid lithium and layered lithium-rich manganese-based composite cathode material with a core-shell structure and a preparation method thereof, which belongs to the technical field of material synthesis. The prepared lithium ion composite cathode material takes a layered lithium-rich manganese-based Li[Lia(NixCoyMnz)]O2 as a core material, takes spinel nickel manganese acid lithium LiNi0.5Mn1.5O4 as a shell material; a coprecipitation method is employed to obtain a core-shell precursor, the core-shell precursor and the lithium source are uniformly mixed and calcined to obtain the spinel nickel manganese acid lithium and layered lithium-rich manganese-based composite cathode material with the core-shell structure. According to the invention, the layered lithium-rich manganese-based is taken as the core material, and the spinel nickel manganese acid lithium is taken as the shell material; under the prerequisite that material gram capacity is kept, material structural stability is increased, material cycle, multiplying power and safety performances are improved, function composite and complementation of the core material and the shell layer material can be realized, and the problem that high capacity and high security can not be achieved simultaneously is solved. The composite cathode material has the advantages of simple process and obviously increased performance.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a lithium-ion battery positive electrode material and a preparation method thereof, in particular to a core-shell structure spinel lithium nickel manganese oxide, a layered lithium-rich manganese-based composite positive electrode material and a preparation method thereof . Background technique [0002] Lithium-ion batteries have become an ideal power source for portable electronic devices due to their significant advantages such as no memory effect, high operating voltage, and low self-discharge rate. They have also shown great application prospects in fields such as electric vehicles and energy storage power stations. At the same time, the current rapid development of lithium-ion batteries has put forward higher requirements for battery materials in terms of energy density and safety. [0003] For the existing cathode materials, LiCoO 2 Due to the strong oxidation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王振波玉富达刘宝生张音薛原顾大明
Owner 南京时拓能源科技有限公司
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