Preparation method of LiMn1-x-yNixCoyO2 ternary positive electrode material

A technology of nickel cobalt lithium manganate and cathode material, which is applied in the field of preparation of cathode materials for lithium ion batteries, can solve the problems of low lithium ion diffusion coefficient, poor material rate performance, low Coulomb efficiency, etc., and achieves low calcination temperature and improved rate. performance, the effect of improving structural stability

Active Publication Date: 2017-05-31
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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Problems solved by technology

[0004] Although nickel-cobalt lithium manganese oxide ternary cathode materials have such great potential advantages, there are still some defects in the actual application of nickel-cobalt lithium manganese oxide ternary cathode materials on the market, such as: (1) cation mixing makes The coulombic efficiency of the first charge and discharge of the material is low; (2) the diffusion coefficient of lithium ions is low (about 10 -11 cm 2 / S), than LiCoO 2 (10 -9 cm 2 / S) is two orders of magnitude lower, which leads to poor rate performance of this material; (3) poor storage performance

Method used

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  • Preparation method of LiMn1-x-yNixCoyO2 ternary positive electrode material

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Embodiment 1

[0032] A preparation method of a nickel-cobalt lithium manganese oxide ternary positive electrode material, comprising the steps of: first preparing a tartaric acid solution with a concentration of 3mol / L, and then using a molar ratio of Li:Ni:Co:Mn:oxalate:tartaric acid=1.01:0.8 :0.1:0.1:4:1 Add lithium carbonate, nickel acetate, cobalt acetate, manganese acetate and ammonium oxalate to the tartaric acid solution, stir and dissolve to obtain a mixed solution. The resulting mixed solution was left to stand, and after freezing and crystallizing at -2°C for 5 hours, a flocculent precipitate was precipitated, and the flocculent precipitate was obtained by filtration. The flocculent precipitate was washed with deionized water and dried to obtain a precursor. The precursor was heated at 850 Calcined in the air at ℃ for 12h, then cooled in the furnace to obtain flocculent LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material.

Embodiment 2

[0034] A preparation method of a nickel-cobalt lithium manganate ternary positive electrode material, comprising the steps of: first preparing a citric acid solution with a concentration of 1mol / L, and then using a molar ratio of Li:Ni:Co:Mn:oxalate:citric acid=1.1 :0.33:0.33:0.33:2:2 Add lithium acetate, nickel citrate, cobalt citrate, manganese nitrate and sodium oxalate to the citric acid solution, stir and dissolve to obtain a mixed solution, then place the mixed solution in- Freeze and crystallize at 15°C for 1 hour, filter the precipitated flocculent precipitate, wash the precipitate with deionized water, and dry it to obtain a precursor. Calcinate the precursor in oxygen at 900°C for 1 hour, and cool it in the furnace to obtain flocculent Li 1.04 Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 Cathode material.

Embodiment 3

[0036] A preparation method of a nickel-cobalt lithium manganese oxide ternary positive electrode material, comprising the steps of: first preparing an ascorbic acid solution with a concentration of 0.2mol / L, then by molar ratio Li:Ni:Co:Mn:oxalate:ascorbic acid=1.02: 0.5:0.2:0.3:3:4 Add lithium carbonate, nickel chloride, cobalt acetate, manganese nitrate and oxalic acid to the ascorbic acid solution, stir and dissolve to obtain a mixed solution, then let the mixed solution stand and freeze at -8°C Crystallize for 8 hours, filter the precipitated flocculent precipitate, wash the precipitate with deionized water, and dry to obtain the precursor. Calcinate the precursor in air at 1000°C for 3 hours, and then cool in the furnace to obtain flocculent LiNi 0.5 co 0.2 mn 0.3 o 2 Cathode material.

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Abstract

The invention discloses a preparation method of a LiMn1-x-yNixCoyO2 ternary positive electrode material, and belongs to the technical field of energy materials. The preparation method comprises the following steps: (1) adding a lithium source, a nickel source, a cobalt source, a manganese source and a compound containing oxalates into a complexing agent solution, mixing until solving completely to obtain a mixed solution; (2) standing the mixed solution, and performing freezing crystallization to obtain flocculent precipitation; and (3) filtering the flocculent precipitation, washing, drying to obtain a precursor, calcining the precursor, and cooling with a furnace so as to obtain the ternary positive electrode material. The method can be used for improving the charge-discharge specific capacity, the rate capability and the cycle performance of the ternary positive electrode material obviously.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery positive electrode material, in particular to a preparation method of a nickel-cobalt lithium manganate ternary positive electrode material. Background technique [0002] The current commercial lithium-ion battery cathode material is mainly lithium cobalt oxide, but due to its high price and poor thermal stability, it is difficult to be applied in the field of power batteries or energy storage batteries. Due to the characteristics of low cost and abundant resources, lithium iron phosphate and lithium manganate are considered to be positive electrode materials for power lithium-ion batteries with development prospects, but their low capacity and low energy density cannot meet the requirements of high energy density power batteries . Therefore, people have devoted themselves to the research of high-capacity positive electrode materials in recent years. Among them, nickel-cobalt lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/1391
CPCH01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李华成王春飞钟胜奎黄炳行卢道焕李普良黄瑞鸿
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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