Method for preparing modified lithium nickel manganese oxide which is anode material of lithium ion battery

A technology of lithium ion battery and cathode material, which is applied in the field of preparation of modified nickel manganate, can solve the problem of poor cycle performance, thermal stability and high temperature performance, poor battery safety and thermal stability, and difficulty in realizing cobalt Lithium oxide replacement and other issues, to achieve the effect of improving cycle performance and high temperature stability, improving high pressure cycle performance and high temperature stability, and good market promotion value

Active Publication Date: 2016-02-10
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) and lithium iron phosphate (LiFePO 4 ); Lithium cobaltate is currently widely used as a positive electrode material for small lithium-ion batteries, but because cobalt is toxic, resource reserves are limited and expensive, and batteries assembled with lithium cobaltate materials as positive electrode materials have poor safety and thermal stability. Oxygen will be generated at high temperature, which cannot meet the technical requirements of power batteries; although lithium manganate is cheap, environmentally friendly, safe, and has good rate performance and safety performance, its theoretical capacity is not high, and its cycle performance, thermal stability and high temperature performance are relatively low. Poor, the biggest problem in application is poor cycle performance, especially at high temperature, the trivalent manganese ions in the material and the divalent manganese ions formed on the particle surface during high-rate discharge make the material dissolve significantly in the electrolyte , eventually destroying the structure of lithium manganate and reducing the cycle performance of the material; the lithium manganate materials that can be used i...

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  • Method for preparing modified lithium nickel manganese oxide which is anode material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0036] (1) Preparation of manganese salt and nickel salt materials: mix manganese sulfate and nickel sulfate materials with a Mn:Ni molar ratio of 3:1;

[0037] (2) The sol-gel method prepares the nickel-manganese precursor: the mixture obtained in step (1) is added in the chelating agent polyethylene glycol-1000, and the quality of the chelating agent is 120% of the metal Mn+Ni quality, with ammonium bicarbonate Adjust the pH to 8-10, stir until viscous, add pure water under stirring to make a solution with a metal Mn+Ni ion concentration of 100g / l, add a sedimentation aid hydroxyl Methyl cellulose until the precipitation is complete, filter, and dry the precipitate to obtain a nickel-manganese precursor;

[0038](3) Three-dimensional oblique mixing: use a three-dimensional oblique mixer to disperse and mix the nickel-manganese precursor and lithium carbonate salt obtained in step (2) for 2 hours under the medium of polyurethane balls, metal (Mn+Ni): Li moles The ratio is 0....

Embodiment 2

[0046] (1) Preparation of manganese salt and nickel salt materials: mix manganese nitrate and nickel nitrate materials with a Mn:Ni molar ratio of 3:1;

[0047] (2) The sol-gel method prepares the nickel-manganese precursor: the mixture obtained in step (1) is added in the chelating agent polyethylene glycol-4000, and the quality of the chelating agent is 100% of the metal Mn+Ni quality, with ammonium bicarbonate Adjust the pH to 8-10, stir until viscous, add pure water under stirring to make a solution with a metal Mn+Ni ion concentration of 120g / l, add a sedimentation aid hydroxyl that is 5% of the metal Mn+Ni Methyl cellulose until the precipitation is complete, filter, and dry the precipitate to obtain a nickel-manganese precursor;

[0048] (3) Three-dimensional oblique mixing: use a three-dimensional oblique mixer to disperse and mix the nickel-manganese precursor and lithium carbonate salt obtained in step (2) for 4 hours under the medium of zirconia balls, metal (Mn+Ni)...

Embodiment 3

[0056] (1) Preparation of manganese salt and nickel salt materials: mix manganese chloride and nickel chloride materials with a Mn:Ni molar ratio of 3:1;

[0057] (2) Sol-gel method to prepare nickel-manganese precursor: the mixture of step (1) gained is added chelating agent polyethylene glycol-2000, and the quality of chelating agent is 80% of metal Mn+Ni quality, adjusts with ammonium bicarbonate When the pH is 8-10, stir until viscous, add pure water under stirring to make a solution with a metal Mn+Ni ion concentration of 150g / l, and add a settling aid hydroxyformide whose mass is 4% of the mass of the metal Mn+Ni Base cellulose until the precipitation is complete, filter, and dry the precipitate to obtain the nickel-manganese precursor;

[0058] (3) Three-dimensional oblique mixing: use a three-dimensional oblique mixer to disperse and mix the nickel-manganese precursor and lithium carbonate salt obtained in step (2) for 3 hours under the medium of polyurethane balls, me...

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Abstract

The invention discloses a method for preparing modified lithium nickel manganese oxide which is the anode material of a lithium ion battery. The method comprises the following steps: mixing a manganese salt material and a nickel salt material, and preparing a nickel manganese precursor through a sol-gel method; mixing the nickel manganese precursor and the nickel salt by using a three-dimensional oblique type mixing machine; presintering and high temperature sintering, and doping F- or F- and metal cations, then adding a metallic oxide and performing wet coating; and finally, acquiring a lithium nickel manganese oxide finished product by low temperature sintering, fluid energy milling and grading. The method provided by the invention uses an ion doping modification technology to improve the cycle performance and high temperature stability of the lithium nickel manganese oxide, and uses a wet coating technology to improve the high pressure cycle performance and high temperature stability of the lithium nickel manganese oxide.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a preparation method of modified lithium nickel manganese oxide. Background technique [0002] Lithium-ion power battery is currently recognized as the most potential vehicle battery at home and abroad. It is mainly composed of positive electrode materials, negative electrode materials, separators, electrolytes, etc. Among them, positive electrode materials are an important part of lithium-ion batteries and also determine the quality of lithium-ion batteries. Therefore, in terms of resources, environmental protection and safety performance, finding the ideal electrode active material for lithium-ion batteries is still the primary problem to be solved by international energy materials workers. [0003] Lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) and lithium iron phosphate (LiFePO 4 ); Lithium cobaltate is currently widely used as a positive elect...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/1315H01M4/13915H01M10/0525
CPCH01M4/1315H01M4/13915H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028H01M2220/20Y02E60/10
Inventor 陈南雄李华成李普良王春飞李海亮张丽云胡明超李林辉黎兆明
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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