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Lithium battery positive electrode material molybdenum doping method

A positive electrode material and lithium battery technology, applied in the field of metallurgical electrode materials, can solve the problems that the method of doping molybdenum cannot satisfy low energy consumption and uniform diffusion at the same time, and achieve the effects of improving processing performance and electrical performance, easy crushing, and increased gram capacity

Pending Publication Date: 2021-05-28
HUNAN XINDA NEW MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the existing molybdenum-doped method cannot satisfy low energy consumption and uniform diffusion at the same time. In order to overcome the deficiencies and defects mentioned in the above background technology, the present invention provides a lithium battery positive electrode with uniform doping and simple process Material molybdenum doping method

Method used

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  • Lithium battery positive electrode material molybdenum doping method

Examples

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Effect test

Embodiment 1

[0030] Lithium manganate product example 1: Lithium manganate doped with 0.5% molybdenum was synthesized by electrolytic manganese dioxide.

[0031] (1) preparation concentration is the lithium molybdate solution of 1.8mol / L; Get the electrolytic manganese dioxide 800Kg that particle size D50 is 16 μ m, add lithium carbonate by the lithium manganese ratio of 0.54, put into the oblique mixer that volume is 2.5 cubic meters Mix for 2 hours; add 22.6 L of the prepared lithium molybdate solution and continue mixing for 0.5 hours. After testing, a mixture with a water content of 2.8% is obtained.

[0032] (2) Put the wet material into the sagger, control the thickness of the material layer in the sagger to 6 cm, the material enters the roller kiln with the sagger, control the temperature rise rate of the heating section of the roller kiln to 5°C / min, and the material passes through 800°C After roasting for 15 hours, it is cooled to about 100°C for 6 hours and released from the furn...

Embodiment 2

[0038] Lithium manganate product example 2: Synthesize lithium manganate doped with 0.5% molybdenum with spherical trimanganese tetraoxide.

[0039] (1) Prepare a lithium molybdate solution with a concentration of 1.8mol / L. Take 800Kg of spherical trimanganese tetraoxide with particle size D50 of 10 μm, add industrial grade lithium carbonate according to the ratio of lithium to manganese of 0.54, put it into an oblique mixer with a volume of 2.5 cubic meters and mix for 2 hours; add the prepared lithium molybdate solution 26.7 L and continue mixing 0.5 hour, after testing, obtain the mixing material that moisture content is 2.5%;

[0040] (2) Put the wet material into the sagger, control the thickness of the material layer in the sagger to 5 cm, the material enters the roller kiln with the sagger, control the temperature rise rate of the heating section of the roller kiln to 5°C / min, and the material passes through 770°C After roasting for 12 hours, it is cooled to about 100°...

Embodiment 3

[0046] Example 3 of 523 ternary product: 523 ternary cathode material doped with 0.5% molybdenum was synthesized by using 523 ternary precursor.

[0047] (1) Prepare a lithium molybdate solution with a concentration of 1.8mol / L. Take 90g of 523 ternary precursor whose particle size D50 is 10 μm, add lithium carbonate according to the ratio of Li:M=1.02, put it into a ball mill tank and mix for 2 hours; add 2.74ml of prepared lithium molybdate solution and continue mixing for 0.5 hours After testing, a mixture with a moisture content of 2.0% was obtained;

[0048] (2) Put the wet material into the sagger, and the material enters the atmosphere furnace with the sagger, and the heating rate of the heating section is controlled to be 5°C / min. The material is roasted at 830°C for 12 hours, and then cooled to about 100°C for 6 hours before being released from the furnace. The material in the sagger is agglomerated but easily crushed, and then crushed and sieved to obtain a 523 ternar...

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Abstract

The invention discloses a lithium battery positive electrode material molybdenum doping method, which comprises: (1) mixing lithium molybdate, a precursor and a lithium source, and adding water in the mixing process to obtain a water-containing wet material with a water mass fraction of 1-5%; and (2) carrying out subsequent high-temperature sintering on the water-containing wet material, cooling, crushing and sieving to obtain the molybdenum-doped positive electrode material. The molybdenum doping method disclosed by the invention is uniform in doping and simple in process, can solve the problem of relatively high energy consumption caused by drying a large amount of water in a mother liquor evaporation molybdenum doping method, and effectively improves the gram volume of the positive electrode material on the premise of maintaining the cycle performance.

Description

technical field [0001] The invention belongs to the field of metallurgical electrode materials, and in particular relates to a molybdenum-doped method for a positive electrode material of a lithium battery. Background technique [0002] As a new generation of environmentally friendly and high-energy batteries, lithium-ion batteries have become one of the research hotspots in the battery industry to improve their performance. Doping and coating lithium-ion battery cathode materials is the main method to improve the overall performance of cathode materials. [0003] Existing studies have shown that doping molybdenum is beneficial to improve the capacity, conductivity and cycle performance of positive electrode materials. A method of doping molybdenum with elemental materials. The disclosed molybdenum doping methods include precursor precipitation molybdenum doping method, mother liquor evaporation to dryness molybdenum doping method and solid phase mixing molybdenum doping me...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/505H01M4/525H01M10/052
CPCC01G45/1257H01M4/505H01M4/525H01M10/052C01P2002/52C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 易鑫管晓东刘浩周小军李达飞刘务华
Owner HUNAN XINDA NEW MATERIALS CO LTD
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