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Preparation method of manganese phosphate coated lithium-rich oxide positive electrode material

A manganese phosphate package and cathode material technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problem of low Coulomb efficiency, poor high rate performance and cycle performance, and lithium-rich manganese-based cathode materials cannot achieve high capacity. and other problems, to achieve the effect of simple process, cheap raw materials and excellent electrochemical performance

Inactive Publication Date: 2019-06-14
湖北锂诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, lithium-rich manganese-based cathode materials usually cannot achieve the theoretically high capacity when used. People are trying different methods to improve their electrochemical performance, including adding a coating layer or doping other metal ions on the existing lithium-rich manganese-based materials. , develop new lithium-rich manganese-based materials, or use novel processes to prepare lithium-rich manganese-based materials to change atomic / ion structures, etc.
At present, the problems of low Coulombic efficiency, high rate performance and poor cycle performance of lithium-rich manganese-based cathode materials for the first time are still not fully resolved.

Method used

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  • Preparation method of manganese phosphate coated lithium-rich oxide positive electrode material
  • Preparation method of manganese phosphate coated lithium-rich oxide positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Li 1.17 Ni 0.21 co 0.08 mn 0.54 o 2 Preparation: add an appropriate amount of NiSO 4 ·6H 2 O, CoSO 4 ·7H 2 O and MnSO 4 4H 2 O (molar ratio Ni:Co:Mn=0.21:0.08:0.54) was dissolved in deionized water containing 0.1mol / L ammonia water. Then 4mol / L NaOH aqueous solution is slowly added in the solution, and control solution pH=11, obtains (Ni 0.21 co 0.08 mn 0.54 )(OH) 2 Precursor. Will (Ni 0.21 co 0.08 mn 0.54 )(OH) 2 The precursor was filtered and dried with LiOH·H 2 O was mixed ball milled for 2 h, calcined in a muffle furnace at 400 °C for 5 h, and then at 800 °C for 15 h to obtain pure Li 1.17 Ni 0.21 co 0.08 mn 0.54 o 2 powder, the molar ratio Li:Ni:Co:Mn=1.174:0.220:0.079:0.551 was determined by inductively coupled plasma mass spectrometry.

[0024] PPML 4 Coated Li 1.17 Ni 0.21 co 0.08 mn 0.54 o 2 Preparation of Li-rich materials: adding an appropriate amount of Mn(CH 3 COO) 2 4H 2 O and citric acid were dissolved in 20 mL ethanol, Mn...

Embodiment 2

[0026] Li 1.17 Ni 0.21 co 0.08 mn 0.54 o 2 Preparation: add an appropriate amount of NiSO 4 ·6H 2 O, CoSO 4 ·7H 2 O and MnSO 4 4H 2 O (molar ratio Ni:Co:Mn=0.21:0.08:0.54) was dissolved in deionized water containing 0.1mol / L ammonia water. Then 4mol / L NaOH aqueous solution is slowly added in the solution, and control solution pH=11, obtains (Ni 0.21 co 0.08 mn 0.54 )(OH) 2 Precursor. Will (Ni 0.21 co 0.08 mn 0.54 )(OH) 2 The precursor was filtered and dried with LiOH·H 2 O was mixed ball milled for 2 h, calcined in a muffle furnace at 400 °C for 5 h, and then calcined in a muffle furnace at 850 °C for 12 h to obtain pure Li 1.17 Ni 0.21 co 0.08 mn 0.54 o 2 powder, the molar ratio Li:Ni:Co:Mn=1.182:0.208:0.084:0.536 was determined by inductively coupled plasma mass spectrometry.

[0027] PPML 4 Coated Li 1.17 Ni 0.21 co 0.08 mn 0.54 o 2 Preparation of Li-rich materials: adding an appropriate amount of Mn(CH 3 COO) 2 4H 2 O and citric acid were d...

Embodiment 3

[0029] Li 1.17 Ni 0.21 co 0.08 mn 0.54 o 2 Preparation: add an appropriate amount of NiSO 4 ·6H 2 O, CoSO 4 ·7H 2 O and MnSO 4 4H 2 O (molar ratio Ni:Co:Mn=0.21:0.08:0.54) was dissolved in deionized water containing 0.1mol / L ammonia water. Then 4mol / L NaOH aqueous solution is slowly added in the solution, and control solution pH=11, obtains (Ni 0.21 co 0.08 mn 0.54 )(OH) 2 Precursor. Will (Ni 0.21 co 0.08 mn 0.54 )(OH) 2 The precursor was filtered and dried with LiOH·H 2 O was mixed ball milled for 2 h, calcined in a muffle furnace at 400 °C for 5 h, and then calcined in a muffle furnace at 900 °C for 10 h to obtain pure Li 1.17 Ni 0.21 co 0.08 mn 0.54 o 2 powder, the molar ratio Li:Ni:Co:Mn=1.203:0.212:0.078:0.547 was determined by inductively coupled plasma mass spectrometry.

[0030] PPML 4 Coated Li 1.17 Ni 0.21 co 0.08 mn 0.54 o 2 Preparation of Li-rich materials: adding an appropriate amount of Mn(CH 3 COO) 2 4H 2 O and citric acid were d...

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Abstract

The invention relates to a preparation method of a manganese phosphate coated lithium-rich oxide positive electrode material. The positive electrode material is obtained by preparing Li1.17Ni0.21Co0.08Mn0.54O2 and a manganese phosphate coated Li1.17Ni0.21Co0.08Mn0.54O2 lithium-rich material. The method has the advantages of simple process, easy operation, low energy consumption, and low cost and easy availability of raw materials; and the prepared positive electrode material has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of manganese phosphate-coated lithium-rich oxide positive electrode materials. Background technique [0002] High-energy lithium-ion batteries are urgently needed for the already dominated electronics market, the growing electric vehicle market, and for renewable energy storage in smart grids. In order to develop advanced lithium-ion batteries, people have conducted a lot of research on high-energy-density positive electrode materials. Among them, the theoretical specific capacity of lithium-rich manganese-based materials is as high as 250mAh / g, and it has a high working voltage. Manganese is in the composition of materials. It can exceed 50%, and it also has advantages in terms of price and environmental protection. [0003] However, lithium-rich manganese-based cathode materials usually cannot achie...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 杨志远王聪张天赐
Owner 湖北锂诺新能源科技有限公司
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