Method for preparing nickel-cobalt lithium manganate monocrystal cathode material by doping strontium

A technology of nickel cobalt lithium manganate and cathode material, applied in the direction of polycrystalline material growth, single crystal growth, single crystal growth, etc., can solve the problems of poor electrical properties such as specific capacity and cycle performance, and unstable secondary particles, etc. Achieve high specific capacity, facilitate lithium ion transport, and reduce side reactions
CN110867580AInactive Publication Date: 2020-03-06四川新锂想能源科技有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
四川新锂想能源科技有限责任公司
Publication Date
2020-03-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing a nickel-cobalt lithium manganate monocrystal cathode material by doping strontium, comprising the following steps: uniformly mixing ternary cathode material precursor powders, lithium carbonate powders, and a fluxing agent in proportion to obtain mixed powders; calcining the mixed powder for the first time at a temperature of 910 to 970 degrees centigrade to obtain a primary calcined product; calcining the primary powders at a temperature of 780 to 880 degrees centigrade to obtain a nickel-cobalt lithium manganate cathode material, wherein the ternary cathode material precursor is Ni0.5Co0.2Mn0.3(OH)2, and the fluxing agent is strontium hydroxide. The cathode material provided by the present invention effectively improves the electrochemicalperformance of the ternary material under a high voltage by improving the structural integrity and surface properties of the cathode material, and exhibits high specific capacity and good cycle performance, can effectively improve high-temperature cycling and gas production of polycrystalline materials.
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Description

Technical field

[0001] The invention relates to the technical field of batteries, in particular to a method for preparing a nickel-cobalt-manganese lithium monocrystalline positive electrode material by doping strontium. Background technique

[0002] Lithium-ion batteries have accumulated fairly mature technology after decades of application in portable electronic and electrical equipment due to their lightweight and portable design, high energy density, and reusability. At present, the cathode materials that have been successfully applied on a large scale on the market mainly include layered rock salt structure lithium cobalt oxide (LiCoO 2 ) Material, olivine structure of lithium iron phosphate (LiFePO 4 ) Materials and cubic spinel structure of lithium manganate (LiMn 2 O 4 )material. However, with the development of the power battery market, the above-mentioned materials cannot be the best choice for new energy vehicle power modules due to the constraints of the material's ow...

Claims

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