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Osmium-doped LiAlSiO4-coated lithium nickel cobalt manganate positive electrode material and preparation method and application thereof

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of reducing ion and electron migration capabilities, aggravated corrosion of positive electrode materials, and attenuation of battery capacity. Good solid performance, good fluidity, and the effect of improving the rate performance

Inactive Publication Date: 2020-01-07
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This causes micro-cracks to appear between the grain boundaries, which greatly reduces the mobility of ions and electrons, resulting in a rapid decline in battery capacity.
In addition, the nickel-cobalt-lithium-manganese-manganese cathode material with the secondary particle morphology is crushed during the rolling process of the pole piece, which leads to aggravated corrosion of the cathode material by the electrolyte, resulting in capacity fading

Method used

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  • Osmium-doped LiAlSiO4-coated lithium nickel cobalt manganate positive electrode material and preparation method and application thereof
  • Osmium-doped LiAlSiO4-coated lithium nickel cobalt manganate positive electrode material and preparation method and application thereof
  • Osmium-doped LiAlSiO4-coated lithium nickel cobalt manganate positive electrode material and preparation method and application thereof

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Embodiment 1

[0056] This embodiment provides an osmium-doped LiAlSiO 4 Coated nickel-cobalt lithium manganate cathode material and a preparation method thereof, the method comprising the following steps:

[0057] (1) 120g / L of metal ion concentration containing nickel sulfate, cobalt sulfate and manganese sulfate Ni, Co, Mn molar ratio is 6:2:2 mixed solution and the sodium carbonate solution of 300g / L and the ammoniacal liquor of 300g / L in React at 50°C and pH 12.0 to obtain the precursor;

[0058] (2) Mix 20kg of the precursor obtained in step (1) with 7.5kg of lithium nitrate and 50g of osmium dioxide and sinter at 900°C for 20h to obtain the substrate;

[0059] (3) the base material 20kg that step (2) obtains and 278g Al(NO 3 ) 3 9H 2 O, 31g LiOH·H 2 O and 45g SiO 2 Mixing, and secondary sintering at 500°C for 20h to obtain the osmium-doped LiAlSiO 4 Coated nickel cobalt lithium manganate cathode material.

[0060] Observation by scanning electron microscope shows that the part...

Embodiment 2

[0063] This embodiment provides an osmium-doped LiAlSiO 4 Coated nickel-cobalt lithium manganate cathode material and a preparation method thereof, the method comprising the following steps:

[0064] (1) 110g / L of metal ion concentration containing nickel sulfate, cobalt sulfate and manganese sulfate Ni, Co, Mn molar ratio is 6:2:2 mixed solution and the sodium carbonate solution of 100g / L and the ammoniacal liquor of 200g / L in Reaction at 70°C and pH value of 10.0 to obtain the precursor;

[0065] (2) Mix 20kg of the precursor obtained in step (1) with 9.2kg of lithium hydroxide and 50g of osmium dioxide and sinter at 1000°C for 20h to obtain the substrate;

[0066] (3) the base material 20kg that step (2) obtains and 38g Al 2 o 3 , 28g Li 2 CO 3 and 45g SiO 2 mixed, and then sintered at 800°C for 20h to obtain the osmium-doped LiAlSiO 4 Coated nickel cobalt lithium manganate cathode material.

[0067] Observation by scanning electron microscope shows that the particl...

Embodiment 3

[0070] The embodiment provides a kind of osmium-doped LiAlSiO 4 Coated nickel-cobalt lithium manganate cathode material and a preparation method thereof, the method comprising the following steps:

[0071] (1) the 120g / L metal ion concentration containing nickel sulfate, cobalt sulfate and manganese sulfate Ni, Co, Mn molar ratio is 6:2:2 mixed solution and the sodium carbonate solution of 200g / L and the ammoniacal liquor of 300g / L in Reaction at 60°C and pH value of 11.0 to obtain the precursor;

[0072] (2) Mix 20kg of the precursor obtained in step (1) with 8.5kg of lithium carbonate and 50g of osmium dioxide, and sinter at 950°C for 20h to obtain the substrate;

[0073] (3) the base material 20kg that step (2) obtains and 38g Al 2 o 3 , 31g LiOH·H 2 O and 45g SiO 2 mixing, and secondary sintering at 700° C. for 8 hours to obtain the nickel-cobalt lithium manganese oxide positive electrode material.

[0074] Observation by scanning electron microscope shows that the p...

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Abstract

The invention provides an osmium-doped LiAlSiO4 coated lithium nickel cobalt manganate positive electrode material and a preparation method and application thereof. The positive electrode material comprises a base material and a coating layer, wherein the base material is osmium-doped lithium nickel cobalt manganate, the general formula of the base material is LiNiaCobMn<1-a-b>OsxO2, a is greaterthan or equal to 0.3 and less than or equal to 0.8, b is greater than or equal to 0.1 and less than or equal to 0.2, X is less than or equal to 0.01, and the coating layer is LiAlSiO4. The positive electrode material is osmium-doped LiAlSiO4-coated lithium nickel cobalt manganate. The material has the characteristics of high discharge capacity, good cycle performance, excellent rate capability, good processability and the like. The preparation method has the advantages of simple steps, easy operation, low cost and the like.

Description

technical field [0001] The invention belongs to the field of lithium battery cathode materials, and relates to an osmium-doped LiAlSiO 4 Coated nickel-cobalt lithium manganese oxide positive electrode material, preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, wide operating temperature range, no memory effect, and long cycle life. They are widely used in digital products and power tools, and are considered to be ideal power sources for next-generation electric vehicles. The development of lithium-ion batteries with high energy density, high power density, and high safety has broad market prospects. High-nickel cathode materials have the advantages of high theoretical discharge specific capacity, good rate performance, low cost, and high safety, and are suitable for use as high-energy cathode materials for electric vehicles (EV), hybrid electric vehicles (HEV) and plug-in hybrid electr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 温伟城杨顺毅严武渭吴小珍黄友元杨才德
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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