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Lithium nickel cobalt manganese positive electrode material and preparation method thereof

A technology of lithium-nickel-cobalt-manganese and cathode materials, which is applied in the field of lithium-ion batteries, can solve the problems of little improvement in cycle performance, reduction in capacity and rate performance, and failure to achieve comprehensive performance of the battery, achieving excellent cycle performance, high specific capacity, Ease of industrial production

Inactive Publication Date: 2014-01-01
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, a single doping or coating is often unable to obtain lithium-nickel-cobalt-manganese cathode materials with excellent comprehensive performance, for example, Al 2 o 3 , AlPO 4 Surface coating can improve the cycle performance and safety performance of lithium-nickel-cobalt-manganese cathode materials, but it will lead to a decrease in capacity and rate performance; while Mg, Ti, etc. doping can improve the rate performance of lithium-nickel-cobalt-manganese cathode materials, but it has a negative impact on the cycle performance. The performance improvement is not large, and it cannot meet the needs of improving the overall performance of the battery

Method used

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  • Lithium nickel cobalt manganese positive electrode material and preparation method thereof
  • Lithium nickel cobalt manganese positive electrode material and preparation method thereof
  • Lithium nickel cobalt manganese positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1) According to the molecular formula Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 The proportion of transition metals to prepare NiSO 4 、CoSO 4 , MnSO 4 mixed aqueous solution, wherein the concentration of cations is 2mol / L;

[0032] 2) Add the mixed aqueous solution in step 1), 2mol / L NaOH solution, and 3mol / L ammonia solution dropwise into the reaction vessel, control the pH value of the system at 11.0, heat the water bath to 50°C, and react for 12 hours, filter, After washing and vacuum drying at 120 °C for 8 h, the precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3) (OH) 2 , its D50=5μm;

[0033] 3) the precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 2 1. Aluminum nitrate nonahydrate and urea nonahydrate are precursors in molar ratio: Al: urea = 100: 0.5: 8.35 The ratio of 50g precursor, 3.67g aluminum nitrate nonahydrate, and 5.35g urea nonahydrate are dissolved in 250mL. In ionized water, stir to disperse evenly and heat up to 70°C, keep stirring for 1h, filter to obtain Al(OH) 3 Coated (Ni ...

Embodiment 2

[0037] 1) According to the molecular formula Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 The proportion of transition metals to prepare NiSO 4 、CoSO 4 , MnSO 4 mixed aqueous solution, wherein the concentration of cations is 2mol / L;

[0038] 2) Add the mixed aqueous solution in step 1), 2mol / L NaOH solution, and 3mol / L ammonia solution dropwise into the reaction vessel, control the pH value of the system at 11.0, heat the water bath to 50°C, and react for 12 hours, filter, After washing and vacuum drying at 120 °C for 8 h, the precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3) (OH) 2 , its D50=8μm;

[0039] 3) The precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3) (OH) 2 , magnesium nitrate and dispersant urea are precursors in molar ratio: Mg: urea = 100: 0.01: 8.35 ratio, weigh 50g precursor, 3.67g magnesium nitrate and 5.35g dispersant urea and dissolve them in 250mL deionized water, stir Disperse evenly and heat up to 70°C, keep stirring for 1h, filter to obtain Mg(OH) 2 Coated precursor with D50=10μm;

[0...

Embodiment 3

[0043] 1) According to the molecular formula Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 The proportion of transition metals to prepare NiSO 4 、CoSO 4 , MnSO 4 mixed aqueous solution, wherein the concentration of cations is 2mol / L;

[0044] 2) Add the mixed aqueous solution in step 1), 2mol / L NaOH solution, and 3mol / L ammonia solution dropwise into the reaction vessel, control the pH value of the system at 11.0, heat the water bath to 50°C, and react for 12 hours, filter, After washing and vacuum drying at 120 °C for 8 h, the precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3) (OH) 2 , its D50=6μm;

[0045] 3) 50g precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3) (OH) 2 Disperse in a mixed solution of 50ml of absolute ethanol and 5ml of deionized water, then dropwise add 0.026M tetrabutyl titanate in isopropanol solution, stir for 1h after the dropwise addition, and filter to obtain Ti(OH) 4 Coated precursor with D50=8μm;

[0046] 4) Ti(OH) obtained in step 3) 4 Coated precursor powder with 40.76gLi 2 CO 3 T...

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Abstract

The invention discloses a lithium nickel cobalt manganese positive electrode material. The lithium nickel cobalt manganese positive electrode material comprises a lithium nickel cobalt manganese oxide contained core pure phase layer having a thickness of 5-8mum, a surface coat containing oxides, phosphates or fluorides of coating elements comprising Li, Al, Mg, Ti and Zr and having a thickness of 50-100nm, and a superficial doped transition layer positioned between the core pure phase layer and the surface coat, containing doping elements comprising Al, Mg, Ti and Zr or one of rare earth elements and having a thickness of 1-2mum. The lithium nickel cobalt manganese positive electrode material can inhibit the material dissolving in a cycle process without reducing a specific capacity, and has the characteristics of high capability excellent cycle and rate performances, and excellent thermal stability.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries. More specifically, the invention relates to a composite modified lithium-nickel-cobalt-manganese positive electrode material and a preparation method thereof. Background technique [0002] Cathode material lithium nickel cobalt manganese (LiNi x co y mn 1-x-y o 2 , 0<x<1, 0<y<1) Since its publication in 2000, it has attracted much attention due to its advantages of stable structure, large discharge specific capacity, high discharge platform, wide range of raw materials and environmental friendliness. It is an ideal cathode material for lithium-ion batteries with high life, high power, high safety and low cost. [0003] However, the high chemical activity of the lithium-nickel-cobalt-manganese cathode material itself makes it easy to react with the electrolyte during the cycle, which reduces the stability of the cathode material. During use, the cathode material is prone to met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 吴振豪郎野何金华吴承仁夏恒涛
Owner NINGDE AMPEREX TECH
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