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A method for hydrothermal modification of lithium-rich manganese-based cathode materials

A positive electrode material, lithium-rich manganese-based technology, applied in the field of hydrothermal modification of lithium-rich manganese-based positive electrode materials, can solve the problems of low initial inventory efficiency, cumbersome operation of conventional coating modification methods, etc., to improve the first coulombic efficiency and discharge specific capacity, improved electrochemical performance, and environmentally friendly effects

Active Publication Date: 2018-05-01
SHANDONG YUHUANG NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to make up for the deficiencies in the prior art, the present invention provides a method for hydrothermal modification of lithium-rich manganese-based positive electrode materials, which effectively solves the problem of low first-time inventory efficiency and conventional coating of lithium-rich manganese-based positive electrode materials. The problem of cumbersome operation of the modification method

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  • A method for hydrothermal modification of lithium-rich manganese-based cathode materials
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  • A method for hydrothermal modification of lithium-rich manganese-based cathode materials

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Embodiment 1

[0038] Synthesis of lithium-rich manganese-based cathode materials by coprecipitation method. First add 700mL of 0.01mol / L (NH 4 ) 2 SO 4 solution, the soluble sulfate MnSO 4 ·H 2 O. CoSO 4 ·7H 2 O, NiSO 4 ·6H 2 O is dissolved in deionized water at a molar ratio of 0.46: 0.2: 0.2, and is mixed with a 2mol / L mixed salt solution; the ammonia water of 0.5mol / L is used as a complexing agent, and the sodium carbonate solution of 2mol / L is used as a precipitating agent , pump all three into a tank containing (NH 4 ) 2 SO 4 In the reaction kettle for the reaction bottom liquid, the stirring speed is controlled at 600rpm, the temperature of the reaction kettle is controlled at 50°C, the flow rate of the precipitant is controlled by the online pH automatic control system, so that the pH value of the reaction system is at 8.0, and the mixed salt solution is controlled at the same time The flow rate of the complexing agent is 1.5mL / min, the flow rate of the complexing agent is...

Embodiment 2

[0043] Synthesis of lithium-rich manganese-based cathode materials by coprecipitation method. First add 800mL of 0.02mol / L (NH 4 ) 2 SO 4 solution, the soluble nitrate Mn(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O is dissolved in deionized water in a molar ratio of 0.54: 0.13: 0.13, and is mixed with a mixed salt solution of 3mol / L; the ammoniacal liquor of 1mol / L is a complexing agent, and the sodium carbonate solution of 3mol / L is a precipitating agent. Pump all three simultaneously into a tank containing (NH 4 ) 2 SO 4 In the reaction kettle for the reaction bottom liquid, the stirring speed is controlled at 1500rpm, the temperature of the reaction kettle is controlled at 60°C, the flow rate of the precipitant is controlled by the online pH automatic control system, so that the pH value of the reaction system is at 7.5, and the mixed salt solution is controlled at the same time The flow rate of the complexing agent is 1.0mL / min, the flow rate of the co...

Embodiment 3

[0047] Synthesis of lithium-rich manganese-based cathode materials by coprecipitation method. First add 1000mL of 0.01mol / L NH 4 HCO 3 solution, the soluble nitrate Mn(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O is dissolved in deionized water in the ratio of 0.46 in molar ratio: 0.2: 0.2, is mixed with the mixed salt solution of 0.5mol / L; With the ammoniacal liquor of 0.1mol / L as complexing agent, with the sodium carbonate solution of 0.1mol / L as Precipitating agent, pump all three into the NH-containing 4 HCO 3 In the reaction kettle for the reaction bottom liquid, the stirring speed is controlled at 1000rpm, the temperature of the reaction kettle is controlled at 80°C, the flow rate of the precipitant is controlled by the online pH automatic control system, so that the pH value of the reaction system is at 10.5, and the mixed salt solution is controlled at the same time The flow rate of the complexing agent is 6.0mL / min, the flow rate of the complexing ag...

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Abstract

The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and particularly relates to a hydrothermal modification method of a lithium-rich manganese-based positive electrode material. The method includes the following steps: dispersing the lithium-rich manganese positive electrode material in a compound aqueous solution in one step of hydrothermal treatment to realize the modification treatment of the material to obtain a lithium-rich manganese-based positive electrode material after hydrothermal modification. Using the high-temperature and high-pressure environment provided by the hydrothermal reaction, different ions interact with the dispersed lithium-rich material, which affects its microstructure, thereby improving the electrochemical performance of the material, reducing the irreversible capacity loss, and improving its first Coulombic efficiency and discharge specific capacity; the method can realize the doping modification of lithium-rich materials through a one-step hydrothermal reaction, the process is simple, the operation is convenient, the cost is low, the environment is friendly, and it is suitable for large-scale industrial production.

Description

(1) Technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a hydrothermal modification method for lithium-rich manganese-based positive electrode materials. (2) Background technology [0002] Energy and environmental issues are the key to the sustainable development of our country. Seeking and developing alternative secondary clean energy is an important national policy of our country at present. Due to its advantages of high voltage, high specific energy, long cycle period, and low environmental pollution, lithium-ion batteries have become a key direction for the development of my country's new energy industry. [0003] The development of high-performance lithium-ion batteries depends on the technological progress of cathode materials, which directly affect important performances such as battery capacity, life, cost, and safety. [0004] Cathode materials are an important p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 周娟董鑫董文明李岩刘爱花邵环香李军伟赵成龙高洪森王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH