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Graded high-nickel ternary anode material, and preparation method and application thereof

A positive electrode material and high-nickel technology, applied in the field of graded high-nickel ternary positive electrode material and its preparation, can solve the problems of phase change, service life and safety reduction, cost increase, etc.

Inactive Publication Date: 2019-06-14
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ternary cathode material series is a high-energy-density material that is generally favored by researchers, and is the mainstream direction in the market at present. According to the content of transition metals nickel, cobalt, and manganese / aluminum, it is mainly divided into 111, 523, 622, and 811 series. Among them, The 111 and 523 series have good cycle stability and high safety, but the high content of cobalt in this series greatly increases the cost, and the energy density cannot meet people's current needs (the energy density of a single cell is greater than 300Wh / Kg); High nickel series 523, 622 and 811 reduce cost by increasing nickel content and reducing cobalt content, and improve energy density and battery life, but their service life and safety are correspondingly reduced
Document CN 108172825A discloses a method for preparing a low-cost lithium cobalt oxide cathode material in which small-particle single-crystal ternary nickel-cobalt-manganese oxide lithium is mixed with large-grain lithium cobalt oxide and coated with indium sulfide. This method successfully improves the pressure of lithium cobalt oxide. Solid density, and cost saving, but the charging voltage of lithium cobalt oxide materials currently on the market has been required to reach above 4.4V, while the upper limit voltage of ternary nickel cobalt lithium manganese oxide charging generally does not exceed 4.3V, otherwise it will cause serious phase change , making the cycle worse

Method used

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  • Graded high-nickel ternary anode material, and preparation method and application thereof
  • Graded high-nickel ternary anode material, and preparation method and application thereof
  • Graded high-nickel ternary anode material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The preparation method of the graded high-nickel ternary cathode material in this example is as follows:

[0059] S1: First select the micropowder LiOH·H with a volume particle size distribution D50 of 15 μm 2 O, dehydrate and dry in a rake vacuum dryer at 150°C for 3 hours to obtain anhydrous LiOH with a D50 of 24 μm;

[0060] S2: Use Ni with a particle size D50 of 12 μm 0.8 co 0.1 mn 0.1 (OH) 2 Anhydrous LiOH obtained from precursor and S1 and 1500ppm additive ZrO 2 Mixed, and at 750°C, 150m 3 Sintered in a roller kiln with oxygen flow rate of / h for 18 hours, then crushed by a mechanical mill, washed with water, centrifuged, dried, and then mixed with 2000ppm additive Al 2 o 3 Mix, and carry out sintering coating at 600°C for 6 hours to obtain polycrystalline LiNi with a secondary average particle size of 12 μm 0.8 co 0.1 mn 0.1 o 2 Material;

[0061] S3: another Ni with D50 at 4μm 0.8 co 0.1 mn 0.1 (OH) 2 Anhydrous LiOH obtained from precursor and S1...

Embodiment 2

[0064] The preparation method of the graded high-nickel ternary cathode material in this example is as follows:

[0065] S1: First select the micropowder LiOH·H with a volume particle size distribution D50 of 12 μm 2 O, dehydrate and dry in a rake vacuum dryer at 160°C for 2 hours to obtain anhydrous LiOH with a D50 of 22 μm;

[0066] S2: Use Ni with a particle size D50 of 10 μm 0.9 co 0.05 mn 0.05 (OH) 2 Anhydrous LiOH obtained from precursor and S1 and 2000ppm additive Sb 2 o 5 Mixed, and at 770°C, 200m 3 Sintered in roller kiln with oxygen flow rate of / h for 16h, then crushed by mechanical mill, washed with water, centrifuged, dried, and added with 1500ppm TiO 2 Mix, and carry out 5h dicalcination coating at 580°C to obtain polycrystalline LiNi with a secondary average particle size of 10μm 0.90 co 0.05 mn 0.05 o 2 Material;

[0067] S3: another Ni with D50 at 4μm 0.5 co 0.2 mn 0.3 (OH) 2 Precursors and Li 2 CO 3 And 1000ppm additive TiO 2 Mixed, and at ...

Embodiment 3

[0070] The preparation method of the graded high-nickel ternary cathode material in this example is as follows:

[0071] S1: First select fine powder LiOH·H with a volume particle size distribution D50 of 13 μm 2 O, dehydrate and dry in a rake vacuum dryer at 150°C for 3 hours to obtain anhydrous LiOH with a D50 of 23 μm;

[0072] S2: Use Ni with a particle size D50 of 12 μm 0.8 co 0.15 Al 0.05 (OH) 2 Anhydrous LiOH obtained from precursor and S1 and 1500ppm additive Y 2 o 3 Mixed, and at 760°C, 100m 3 Sintered in roller kiln with oxygen flow rate of / h for 14h, then crushed by mechanical mill, washed with water, centrifuged, dried, and mixed with 1000ppm additive Al(OH) 3 Mixed and covered with dicalcin at 650°C for 8 hours to obtain polycrystalline LiNi with an average particle size of secondary aggregates of 12 μm 0.8 co 0.15 Al 0.05 o 2 Material;

[0073] S3: Another Ni with D50 at 4.5μm 0.65 co 0.15 mn 0.2 (OH) 2 The precursor was mixed with anhydrous LiOH...

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Abstract

The invention discloses a graded high-nickel ternary anode material, and a preparation method and an application thereof. The graded high-nickel ternary anode material is prepared by the following method: 1) mixing a high-nickel polycrystalline precursor with anhydrous LiOH and a doping additive, performing sintering, mixing the obtained product with a coating additive, and performing sintering toobtain a high-nickel polycrystalline material; 2) mixing a ternary monocrystalline silicon precursor with a lithium source and the doping additive, performing sintering, mixing the obtained product with the coating additive, and performing sintering to obtain a ternary monocrystalline silicon material; and 3) mixing the high-nickel polycrystalline material with the ternary monocrystalline siliconmaterial, or mixing the mixed material with the coating additive, and then performing sintering. The invention further discloses an application of the graded high-nickel ternary anode material in lithium batteries. The graded material prepared by the method provided by the invention has higher compaction and cycle stability than the single polycrystalline material, has higher capacity than the single monocrystalline silicon, and the gas production and service life problems of the battery can be effectively improved after the grading modification.

Description

technical field [0001] The invention relates to a lithium-ion battery positive electrode material, in particular to a graded high-nickel ternary positive electrode material and a preparation method and application thereof. Background technique [0002] With the increasing electrification of society, people's requirements for lithium-ion battery life are also increasing, which requires battery materials to have higher energy density. The ternary cathode material series is a high-energy-density material that is generally favored by researchers, and is the mainstream direction in the market at present. According to the content of transition metals nickel, cobalt, and manganese / aluminum, it is mainly divided into 111, 523, 622, and 811 series. Among them, The 111 and 523 series have good cycle stability and high safety, but the high content of cobalt in this series greatly increases the cost, and the energy density cannot meet people's current needs (the energy density of a sing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 许帅军阮丁山刘伟健唐盛贺林波陈希文李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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