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Modified spherical nickel cobalt lithium manganate NCM622 anode material and preparation method thereof

A technology of nickel-cobalt-lithium-manganese-manganate and positive-electrode materials, applied in the field of modified spherical nickel-cobalt-lithium-manganese-manganese-oxide NCM622 positive electrode material and its preparation, which can solve the problem of low cycle performance and rate performance, poor thermal stability and safety of positive electrode materials, etc. problems, achieve good cycle performance, low production cost, and improve cycle and rate performance

Inactive Publication Date: 2016-10-26
四川省有色冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned problems existing in the prior art, the present invention provides a modified spherical lithium nickel cobalt manganese oxide NCM622 positive electrode material and a preparation method thereof, which can effectively solve the poor thermal stability and safety of the lithium nickel cobalt manganese oxide NCM622 positive electrode material, Problems with low cycle performance and rate performance

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  • Modified spherical nickel cobalt lithium manganate NCM622 anode material and preparation method thereof
  • Modified spherical nickel cobalt lithium manganate NCM622 anode material and preparation method thereof
  • Modified spherical nickel cobalt lithium manganate NCM622 anode material and preparation method thereof

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Embodiment 1

[0030] A modified spherical nickel-cobalt lithium manganese oxide NCM622 positive electrode material, the chemical formula of the positive electrode material is Li[Ni 0.6 co 0.2 mn 0.2 ] 0.98 Mg 0.02 o 1.98 f 0.02 .

[0031] The preparation method of above-mentioned cathode material comprises the following steps:

[0032] (1) Solution preparation: according to the molar ratio of Ni, Co and Mn as 6:2:2, respectively weigh Ni(SO 4 )·6H 2 O, Co(SO 4 ) 7H 2 O and Mn(SO 4 )·H 2 O, and it is formulated into a mixed solution whose total metal ion concentration is 2mol / L;

[0033] (2) After blowing nitrogen into the reactor for 20 minutes, add 500 mL of NH with a concentration of 0.5 mol / L 4 OH solution was used as the bottom solution, and the mixed solution in step (1), NaOH solution with a concentration of 1mol / L and NH solution with a concentration of 0.5mol / L were respectively mixed with a metering pump 4Add the OH solution into the reactor, control the flow rate of ...

Embodiment 2

[0040] A modified spherical nickel-cobalt lithium manganese oxide NCM622 positive electrode material, the chemical formula of the positive electrode material is Li[Ni 0.6 co 0.2 mn 0.2 ] 0.96 Mg 0.04 o 1.97 f 0.03 .

[0041] The preparation method of above-mentioned cathode material comprises the following steps:

[0042] (1) Solution preparation: according to the molar ratio of Ni, Co and Mn as 6:2:2, respectively weigh Ni(SO 4 )·6H 2 O, Co(SO 4 ) 7H 2 O and Mn(SO 4 )·H 2 O, and it is formulated into a mixed solution whose total metal ion concentration is 2mol / L;

[0043] (2) After blowing nitrogen into the reactor for 20 minutes, add 500 mL of NH with a concentration of 0.5 mol / L 4 OH solution was used as the bottom solution, and the mixed solution in step (1), NaOH solution with a concentration of 1mol / L and NH solution with a concentration of 0.5mol / L were respectively mixed with a metering pump 4 Add the OH solution into the reactor, control the flow rate of...

Embodiment 3

[0048] A modified spherical nickel-cobalt lithium manganese oxide NCM622 positive electrode material, the chemical formula of the positive electrode material is Li[Ni 0.6 co 0.2 mn 0.2 ] 0.95 Mg 0.05 o 1.96 f 0.04 .

[0049] The preparation method of above-mentioned cathode material comprises the following steps:

[0050] (1) Solution preparation: according to the molar ratio of Ni, Co and Mn as 6:2:2, respectively weigh Ni(SO 4 )·6H 2 O, Co(SO 4 ) 7H 2 O and Mn(SO 4 )·H 2 O, and it is formulated into a mixed solution whose total metal ion concentration is 2mol / L;

[0051] (2) After blowing nitrogen into the reactor for 20 minutes, add 500 mL of NH with a concentration of 0.5 mol / L 4 OH solution was used as the bottom solution, and the mixed solution in step (1), NaOH solution with a concentration of 1mol / L and NH solution with a concentration of 0.5mol / L were respectively mixed with a metering pump 4 Add the OH solution into the reactor, control the flow rate of...

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Abstract

The invention discloses a modified spherical nickel cobalt lithium manganate NCM622 anode material. A general formula of the anode material is Li[NiCo0.2Mn0.2]xMg1-xO2-yFy, wherein x is greater than or equal to 0.01 and less than or equal to 0.05, and y is greater than or equal to 0.2 and less than or equal to 0.4. The preparation method includes following steps: (1), preparing a solution; (2), feeding nitrogen into a reaction kettle for 20 min, respectively adding the mixed solution in the step (1), NaOH solution of 1 mol / L in concentration and NH4OH solution of 0.5 mol / L in concentration, and stirring for reaction; (3), subjecting Ni0.6Co0.2Mn0.2(OH)2 precursor, battery-grade lithium carbonate, magnesium acetate and lithium fluoride to ball milling for mixing for 3-4 h; (4), performing solid-phase sintering. The modified anode material is high in stability and safety and excellent in cycling performance and multiple rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a modified spherical nickel-cobalt lithium manganese oxide NCM622 positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, power density, high working voltage, good cycle performance and low self-discharge rate. They are known as "green power sources" and can be widely used in mobile phones and notebook computers. , the power supply of portable electronic products such as digital cameras, at the same time, it is also an ideal electric vehicle power supply and energy storage power supply of renewable energy such as wind energy and solar energy. [0003] At present, the key to the development of high-performance lithium-ion batteries lies in the research and development of excellent electrode materials. Layered nickel-cobalt-manganese composite cathode material is a v...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1315H01M4/13915H01M10/0525
CPCH01M4/1315H01M4/13915H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 常丽娟万宁贾元波伍建军高娟
Owner 四川省有色冶金研究院有限公司
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