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Lithium NCM (nickel cobalt manganese) material and preparation method thereof

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the field of nickel-cobalt lithium manganese oxide materials and its preparation, can solve the problems of poor cycle performance and thermal stability, and reduced material processing performance, so as to improve the degree of mixing, Effects of inhibiting corrosion, improving structural stability and thermal stability

Inactive Publication Date: 2017-09-19
四川新锂想能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NCM exhibits different properties with the change of the three element ratios of Ni-Co-Mn, and a variety of positive electrode materials are derived. At present, the main researches generally include: LiNi 0.33 co 0.33 mn 0.33 o 2 (Type 111), LiNi 0.4 co 0.2 mn 0.4 o 2 (Type 424), LiNi 0.5 co 0.2 mn 0.3 o 2 (Type 523), LiNi 0.6 co 0.2 mn 0.2 o 2 (Type 622) and LiNi 0.8 co 0.1 mn 0.1 o 2 (811 type), with the increase of Ni content in the composition, the actual discharge capacity of the material will gradually increase, but its cycle performance and thermal stability will gradually deteriorate, and with the increase of Ni content, the material surface LiOH and Li 2 CO 3 Increased, decreased material processing properties

Method used

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  • Lithium NCM (nickel cobalt manganese) material and preparation method thereof
  • Lithium NCM (nickel cobalt manganese) material and preparation method thereof
  • Lithium NCM (nickel cobalt manganese) material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of composite anion-cation co-doped LiNi 0.78 Mg 0.01 al 0.01 co 0.1 mn 0.1 o 1.98 f 0.02 Cathode material

[0029] Weigh NiSO according to Ni: Co: Mn = molar ratio of 0.8:0.1:0.1 4 、CoSO 4 , MnSO 4 , according to the ratio of 1mol / L, configure it into a salt solution, add it to the reaction kettle, control the solution temperature at 50-60°C, and feed N 2Protect the atmosphere, control the rotation speed of the stirred tank, slowly add 1mol / L complexing agent ammonia water, and then add 0.5mol / L precipitant Na 2 CO 3 solution, the process kept the pH of the solution at 11.5, then stirred and formed for 4 hours to complete the coprecipitation reaction. After the fully reacted slurry is washed with deionized water for 3 times, it has been configured into a 0.1mol / L Mg-Al salt or Mg-Ti mixed solution according to M:A:B=1:0.01:0.01, and the solid content is controlled at 40%, stirring and mixing for 2 hours, and drying the slurry by atomization dryin...

Embodiment 2

[0030] Example 2 Preparation of composite anion and cation co-doped LiNi 0.77 Mg 0.03 Ti 0.03 co 0.1 mn 0.1 o 1.97 f 0.03 Cathode material

[0031] Weigh NiSO according to Ni: Co: Mn = molar ratio of 0.8:0.1:0.1 4 、CoSO 4 , MnSO 4 , according to the ratio of 1mol / L, configure it into a salt solution, add it to the reaction kettle, control the solution temperature at 50-60°C, and feed N 2 Protect the atmosphere, control the rotation speed of the stirred tank, slowly add 1mol / L complexing agent ammonia water, and then add 0.5mol / L precipitant Na 2 CO 3 solution, the process kept the pH of the solution at 11.5, then stirred and formed for 4 hours to complete the coprecipitation reaction. After the fully reacted slurry was washed with deionized water for 3 times, according to M:A:B=1:0.03:0.03, it has been configured into a 0.1mol / L Mg-Ti salt mixed solution, and the solid content is controlled at 40%. Stir After mixing for 2 hours, the slurry was dried by atomization ...

Embodiment 3

[0032] Example 3 Preparation of composite anion and cation co-doped LiNi 0.795 Mg 0.005 Al 0.005 co 0.1 mn 0.1 o 1.995 f 0.005 Cathode material

[0033] Weigh NiSO according to Ni: Co: Mn = molar ratio of 0.8:0.1:0.1 4 、CoSO 4 , MnSO 4 , according to the ratio of 1mol / L, configure it into a salt solution, add it to the reaction kettle, control the solution temperature at 50-60°C, and feed N 2 Protect the atmosphere, control the rotation speed of the stirred tank, slowly add 1mol / L complexing agent ammonia water, and then add 0.5mol / L precipitant Na 2 CO 3 solution, the process kept the pH of the solution at 11.5, then stirred and formed for 4 hours to complete the coprecipitation reaction. After the fully reacted slurry is washed with deionized water for 3 times, it has been configured into a 0.1mol / L Mg-Ti salt mixed solution according to M:A:B=1:0.005:0.005, and the solid content is controlled at 40%. Stir After mixing for 2 hours, the slurry was dried by atomiza...

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Abstract

The invention discloses a lithium NCM (nickel cobalt manganese) material. The lithium NCM material is prepared by doping Mg (magnesium), Al (aluminum) or Ti (titanium) and F (fluorine) into a 811 type lithium NCM cathode material. The lithium nickel manganese cobalt material has the advantages that by simultaneously doping Mg, Al or Ti and F into the 811 type NCM electrode material, the rate discharge property and specific capacity of the material are effectively improved; the corrosion of HF (hydrogen fluoride) to the material is effectively inhibited, the dissolving of Co is reduced, and the structure stability and thermal stability of the material are greatly improved.

Description

technical field [0001] The invention relates to the field of battery cathode materials, in particular to a nickel-cobalt lithium manganese oxide material and a preparation method thereof. Background technique [0002] Layered nickel-cobalt-lithium manganese oxide (NCM) composite cathode material is a promising material, and LiCoO 2 , LiNiO 2 and LiMnO 2 In comparison, it has the advantages of low cost, large discharge capacity, good cycle performance, thermal stability, and relatively stable structure. NCM combines the advantages of three materials through the synergistic effect of Ni-Co-Mn: LiCoO 2 Good cycle performance, LiNiO 2 The high specific capacity and LiMnO 2 It has become one of the most promising new cathode materials for lithium-ion batteries due to its high safety performance and low cost. NCM exhibits different properties with the change of the three element ratios of Ni-Co-Mn, and a variety of positive electrode materials are derived. At present, the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 黄小丽李延俊岳波王俊安向中林
Owner 四川新锂想能源科技有限责任公司
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