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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

Active Publication Date: 2014-04-09
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is aimed at cathode material LiNi 1-x mn x o 2 (x=0.25~0.50) problems such as fast capacity decay and poor cycle performance, the introduction of mixed lithium sources to form eutectic mixed molten salts to synthesize LiNi 1-x mn x o 2 (x=0.25~0.50), and then the positive electrode material LiNi was prepared by a surface coating modification 1-x mn x o 2 / MnO 2 (x=0.25~0.50) method to improve the electrochemical performance of the material

Method used

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

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Embodiment 1

[0023] (1) The nickel-manganese mixed solution (the molar ratio of nickel and manganese metal ions is 3:1) that is configured as a total metal concentration of 2mol / L, 3mol / L ammonia solution and 3mol / L sodium hydroxide solution are pumped continuously with a metering pump into a reactor with a stirring device; the reaction temperature range is controlled at 50°C, the pH value range is 9.0, and the stirring frequency is 100Hz until the pH value of the reaction system reaches 10.5; the precipitate generated by the reaction is introduced into a centrifuge and thrown Dry, and wash with 45°C deionized water until the pH value reaches 11.0; dry the washed precipitate in an oven at 105°C for 6h to remove moisture, and obtain the spherical hydroxide precursor Ni 0.75 mn 0.25 (OH) 2 .

[0024](2) Mix the prepared precursor with the mixed lithium source (the molar ratio is: lithium carbonate: lithium hydroxide = 0.60:0.40) according to the molar ratio of Li: (Ni+Mn) = 1.06:1, and mix...

Embodiment 2

[0027] (1) The nickel-manganese mixed solution with a total metal concentration of 2mol / L (the molar ratio of nickel and manganese metal ions is 1:1), 3mol / L ammonia solution and 3mol / L sodium hydroxide solution are pumped continuously with a metering pump into a reactor with a stirring device; the reaction temperature range is controlled at 50°C, the pH range is 8.5, and the stirring frequency is 100Hz until the pH value of the reaction system reaches 10.0; the precipitate generated by the reaction is introduced into a centrifuge and thrown Dry, and wash with 45°C deionized water until the pH value reaches 10.5; dry the washed precipitate in an oven at 110°C for 6h to remove moisture, and obtain the spherical hydroxide precursor Ni 0.5 mn 0.5 (OH) 2 .

[0028] (2) Mix the prepared precursor with the mixed lithium source (the molar ratio is: lithium carbonate: lithium hydroxide = 0.50:0.50) according to the molar ratio of Li: (Ni+Mn) = 1.05:1, and mix them evenly at 425°C P...

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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%.

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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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 田新勇程迪徐云军尹正中
Owner HENAN KELONG NEW ENERGY CO LTD
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