Preparation technology of modified positive material lithium nickel manganese oxide for lithium-ion battery

A lithium-ion battery and cathode material technology, applied in the field of preparation of modified lithium nickel manganese oxide, can solve the problem of poor cycle performance, thermal stability and high temperature performance, poor battery safety and thermal stability, and difficult to realize Lithium cobalt oxide replacement and other issues, to achieve good marketing value, improve conductivity and cycle performance, moderate particle size effect

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

AI Technical Summary

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 in t

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  • Preparation technology of modified positive material lithium nickel manganese oxide for lithium-ion battery

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Experimental program
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Effect test

Embodiment 1

[0035] (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;

[0036] (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 that is 3% of the metal Mn+Ni Methyl cellulose until the precipitation is complete, filter, and dry the precipitate to obtain a nickel-manganese precursor;

[0037] (3) Three-dimensional oblique mixing: use a three-dimensional oblique mixer to mix the nickel-manganese precursor obtained in step (2) with lithium carbonate and cationic Mg 2+ and anion F - The compound was dispersed and mixed for 2....

Embodiment 2

[0044] (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;

[0045] (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;

[0046] (3) Three-dimensional oblique mixing: use a three-dimensional oblique mixer to mix the nickel-manganese precursor obtained in step (2) with lithium carbonate and cationic Ti 4+ and anion F - The compound was dispersed and mixed for 3....

Embodiment 3

[0053] (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;

[0054] (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;

[0055] (3) Three-dimensional oblique mixing: use a three-dimensional oblique mixer to mix the nickel-manganese precursor obtained in step (2) with lithium carbonate and cationic Al 3+ and anion F - The compound was dispersed and mixed...

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Abstract

The invention discloses a preparation technology of a modified positive material lithium nickel manganese oxide for a lithium-ion battery. The preparation technology comprises the following steps: mixing materials of a manganese salt and a nickel salt to prepare a nickel manganese precursor through a sol-gel method; mixing the nickel manganese precursor, a lithium salt, re-doped F<-> or F<-> and metal cations by a three-dimensional inclined mixer; carrying out pre-sintering and high-temperature sintering, adding a metal oxide and carrying out mixed cladding; and finally carrying out low-temperature sintering, airflow crushing and classification to obtain a finished product lithium nickel manganese oxide. According to the preparation technology, the high temperature performance, the electrochemical cycle performance and the specific discharge capacity of the positive material lithium nickel manganese oxide for the battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a preparation process 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 elec...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/04H01M10/0525
CPCH01M4/0471H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李华成陈南雄李普良钟晴王春飞张丽云胡明超伍锡乐黎兆亮
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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