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Preparation method of lithium ion conductor coated lithium-rich manganese-based positive electrode material

A lithium-rich manganese-based, positive electrode material technology, applied in the direction of positive electrodes, chemical instruments and methods, battery electrodes, etc., can solve the problems of poor cycle stability, high rate performance, and large irreversible capacity, and achieve cycle performance and rate performance Improvement, reduction of lithium ion consumption, and easy availability of synthetic raw materials

Inactive Publication Date: 2021-04-06
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many difficulties in realizing commercial applications of such high-performance materials: large irreversible capacity for the first time, poor cycle stability and high rate performance, etc.

Method used

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  • Preparation method of lithium ion conductor coated lithium-rich manganese-based positive electrode material
  • Preparation method of lithium ion conductor coated lithium-rich manganese-based positive electrode material
  • Preparation method of lithium ion conductor coated lithium-rich manganese-based positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Will Mn 0.667 Ni 0.166 co 0.166 CO 3 Disperse with lithium carbonate in 10mL of absolute ethanol at a molar ratio of 1:1.1, stir for 3 hours, and mix well. Then the solution was dried at 80°C for 5 hours, and the obtained powder was placed in a muffle furnace, and kept at 450°C for 10 hours at a heating rate of 3-5°C / min, and then cooled to room temperature, and then heated at 3-5°C The heating rate of / min raises the temperature to 850 ° C for 16 hours, and cools naturally to room temperature to obtain a lithium-rich manganese-based positive electrode material with the chemical formula Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 .

[0034] Weigh zirconium oxynitrate (ZrO(NO 3 ) 2 ) 1.52mg. Dissolve zirconium oxynitrate and lithium nitrate in 40mL of absolute ethanol at a molar ratio of 2:1, add 2.01mg of urea and stir at a constant speed for 2 hours. After completely dissolving, add 200mg of the prepared lithium-rich manganese-based positive electrode material, Conti...

Embodiment 2

[0036] Will Mn 0.667 Ni 0.166 co 0.166 CO 3Disperse with lithium carbonate in 10mL absolute ethanol at a molar ratio of 1:1.05, stir for 3 hours, and mix well. Then the solution was dried at 80°C for 5 hours, and the obtained powder was placed in a muffle furnace, and kept at 450°C for 6 hours at a heating rate of 3-5°C / min, and then cooled to room temperature, and then heated at 3-5°C The heating rate of / min raises the temperature to 850 ° C for 12 hours, and naturally cools to room temperature to obtain a lithium-rich manganese-based positive electrode material with the chemical formula Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 .

[0037] Weigh 3.05 mg of zirconium oxynitrate, dissolve zirconium oxynitrate and lithium nitrate in 40 mL of absolute ethanol at a molar ratio of 2:1, add 4.04 mg of urea, stir at a constant speed for 2 hours, and add the prepared lithium-rich manganese base after completely dissolving 200mg of positive electrode material, continue to stir for 1...

Embodiment 3

[0039] Will Mn 0.667 Ni 0.166 co 0.166 CO 3 Disperse in 10mL of absolute ethanol with lithium carbonate at a molar ratio of 1:1.15, stir for 3 hours, and mix well. Then the solution was dried at 80°C for 5 hours, and the obtained powder was placed in a muffle furnace, and kept at 450°C for 7 hours at a heating rate of 3-5°C / min, and then cooled to room temperature, and then heated at 3-5°C. The heating rate of / min increases the temperature to 850°C for 13 hours, then cools naturally to room temperature, and the chemical formula of the lithium-rich manganese-based positive electrode material is Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 .

[0040] Weigh 4.60 mg of zirconium oxynitrate, dissolve zirconium oxynitrate and lithium nitrate in 40 mL of absolute ethanol at a molar ratio of 2:1, add 6.1 mg of urea, stir at a constant speed for 2 hours, and add the prepared lithium-rich manganese base after completely dissolving 200mg of positive electrode material, continue to stir f...

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Abstract

The invention discloses a preparation method of a lithium ion conductor coated lithium-rich manganese-based positive electrode material, which comprises the following steps: dispersing a carbonate precursor and lithium carbonate in absolute ethyl alcohol according to a molar ratio of 1:1.02-1.5, uniformly stirring and mixing, drying to obtain powder, putting the obtained powder into a muffle furnace, and carrying out heat preservation twice to obtain the lithium-rich manganese-based positive electrode material; dissolving zirconium oxynitrate and lithium nitrate in 40-80mL of absolute ethyl alcohol, adding urea, stirring until complete dissolution, adding the lithium-rich manganese-based positive electrode material, continuously stirring until uniform, sealing the obtained mixed solution in polytetrafluoroethylene, heating to 120-150 DEG C in a drying oven, keeping for 15-20 hours, cooling to room temperature, performing vacuum filtration, washing, and drying at 80 DEG C for 12 hours, collecting the material powder, putting into a muffle furnace, heating to 500 DEG C, keeping the temperature for 3-6 hours, and cooling to room temperature along with the furnace to obtain the lithium zirconate coated lithium-rich manganese positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of energy storage material design, and in particular relates to a preparation method of a lithium-ion conductor-coated lithium-rich manganese-based positive electrode material. Background technique [0002] The current commercialized cathode materials have low capacity and cannot meet the requirements of new energy electric vehicles. The development of high-performance cathode materials is the key to improving the performance of lithium-ion batteries and promoting the development of new energy electric vehicles. Layered lithium-rich manganese-based oxides have high capacity (>250mAh / g), low cost and good safety, and are considered as the main materials for next-generation power batteries. However, there are still many difficulties in realizing commercial applications of such high-performance materials: large irreversible capacity for the first time, poor cycle stability and high rate performance, etc. Th...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01G25/00H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/44C01G25/00H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028C01P2006/40Y02E60/10
Inventor 李喜飞陈紫璇
Owner TIANJIN NORMAL UNIVERSITY
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