Method for preparing coated lithium ion battery cathode material of lithium nickel manganese oxide

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as fast capacity decay and poor cycle performance, achieve reduced temperature and reaction time, high tap density, and avoid elements. The effect of uneven distribution
CN103715409AActive Publication Date: 2014-04-09HENAN KELONG NEW ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HENAN KELONG NEW ENERGY CO LTD
Publication Date
2014-04-09

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Abstract

The invention discloses a method for preparing a coated lithium ion battery cathode material of lithium nickel manganese oxide, comprising: firstly preparing a spherical precursor Ni1-xMnx(OH)2 (x=0.25-0.50) by a wet-process coprecipitation crystallization process; then mixing the prepared precursor and a mixed lithium source, and by preparing a spherical nickel and manganese binary composite oxide cathode material LiNi-xMnxO2 (x=0.25-0.50) by high temperature solid phase sintering; coating MnCO3 on the surface of the nickel and manganese binary composite oxide by a solution coating method; and finally sintering to obtain the lithium nickel manganese oxide cathode material Ni1-xMnx(OH)2 (x=0.25-0.50) coated with MnO2. The prepared material is spherical particles with smooth and compact surface and perfect layered crystallization, raises discharge specific capacity thereof, and simultaneously greatly raises cycling stability of the material, wherein the initial discharge specific capacity reaches 188.9mAh / g, and a capacity retention ratio after 1C 300 cyclictimes is more than 98.7%.
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Description

technical field

[0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a preparation method for a coated lithium nickel manganese oxide lithium ion battery positive electrode material. technical background

[0002] Due to its high energy density, good cycle performance, no memory effect, strong load capacity, good safety performance and no pollution, lithium-ion batteries are widely used in many fields such as electronic equipment, electric vehicles, military and aerospace. With the gradual marketization of electronic products and electric vehicles, lithium-ion battery cathode materials with higher capacity and higher voltage have attracted widespread attention. The cathode materials currently used in the market mainly include LiCoO 2 , LiNiO 2 , LiMn 2 o 4 and LiFePO 4 and ternary material LiNi 1-x-y co x mn y o 2 (0<x<0.5,0<y<0.5), where LiCoO 2 , LiMn 2 o 4 and LiFePO 4 The ...

Claims

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