Method for modifying nickel lithium manganese anode material for lithium ion batteries

A lithium-ion battery, lithium nickel manganese oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult to uniform and complete coating of materials, affecting the electronic conductivity of materials, complex processes, etc., and achieve electrochemical performance. Excellent, high electronic conductivity, high conductivity effect

Inactive Publication Date: 2013-12-25
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing coating modification technology generally uses zinc oxide, aluminum oxide, silicon dioxide, aluminum fluoride and other substances as coating agents, but most of these substances are semiconductors or insulators, and after coating, the overall electronic conductivity of the material will be affected
Moreover, the existing technology generally adopts liquid phase precipitation technology, and then bakes at a high temperature after coating a layer of hydroxide or fluoride on the surface of the material to complete the coating modification of the material. The process is complicated, there are many control points, and it is difficult to realize Uniform and complete coating of materials

Method used

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  • Method for modifying nickel lithium manganese anode material for lithium ion batteries
  • Method for modifying nickel lithium manganese anode material for lithium ion batteries

Examples

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Effect test

Embodiment 1

[0016] Example 1: Add 10g of lithium nickel manganese oxide and 0.015mol of cetyltrimethylammonium bromide into water and ultrasonically disperse for 10min, then add 0.015mol of ammonium persulfate and ultrasonically for 10min, then add 150ml dropwise with a concentration of 0.1mol / L pyrrole ethanol solution, after the dropwise addition, continue to sonicate for 5min, static aging for 1h, suction filtration, washing, and drying at 80°C to obtain a lithium nickel manganese oxide composite cathode material with a polypyrrole coating amount of 1%. The 1C initial discharge capacity of its button battery is 129.8mAh / g ( figure 1 ), the capacity retention rate of 100 cycles is 100.7% ( figure 2 ).

Embodiment 2

[0017] Example 2: Add 10g of lithium nickel manganese oxide and 0.068mol of sodium dodecylbenzenesulfonate into water and ultrasonically disperse for 15min, then add 0.045mol of ferric chloride and ultrasonically 10min, then add 150ml dropwise at a concentration of 0.3mol / L of pyrrole ethanol solution, continue ultrasonication for 10min after the dropwise addition, static aging for 1.5h, suction filtration, washing, and drying at 90°C to obtain a lithium nickel manganese oxide composite positive electrode material with a polypyrrole coating amount of 3%. The 1C initial discharge capacity of its button battery is 131mAh / g, and the capacity retention rate after 100 cycles is 99.8%.

Embodiment 3

[0018] Example 3: Add 10g of lithium nickel manganese oxide and 0.15mol of sodium lauryl sulfate into water and ultrasonically disperse for 20min, then add 0.075mol of ferric chloride and ultrasonically for 15min, then add 150ml dropwise at a concentration of 0.5mol / L Pyrrole ethanol solution, continue ultrasonication for 15min after the dropwise addition, static aging for 3h, suction filtration, washing, and drying at 100°C to obtain a lithium nickel manganese oxide composite positive electrode material with a polypyrrole coating amount of 5%. The 1C initial discharge capacity of its button battery is 129.5mAh / g, and the capacity retention rate after 100 cycles is 100.1%.

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Abstract

The invention discloses a method for modifying a nickel lithium manganese anode material for lithium ion batteries. The method is characterized by including the steps of adding nickel lithium manganese and a surface modifier into water, carrying out ultrasonic dispersion for 10-20min, then, adding an oxidizing agent, carrying out ultrasonic dispersion for 5-15min, adding a pyrrole ethanol solution with the concentration of 0.1-0.5mol / L dropwise, continuing to carry out ultrasonic dispersion for 5-15min after adding, standing and aging the solution for 1-3h, and obtaining the modified nickel lithium manganese anode material wrapped with polypyrrole after suction filtration, washing and drying at the temperature of 80-100 DEG C. The wrapping amount of the polypyrrole is 0.5-5% of the total mass of the material. The specific surface of the prepared nickel lithium manganese anode material is reduced, and the nickel lithium manganese anode material has good processability and is better in cycle performance when applied to the lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials for chemical power sources, and in particular relates to a surface coating modification method for lithium nickel manganese oxide cathode materials. Background technique [0002] Spinel lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) cathode material is one of the most researched high energy density cathode materials. Its discharge voltage platform is 4.7V, which is about 20% higher than lithium manganate, and its reversible capacity can reach 130mAh / g (theoretical 147mAh / g), which is also about 20% higher than lithium manganate, so it has a higher capacity than lithium manganate. Energy density, and more importantly, all Mn in lithium nickel manganese oxide with ordered structure is +4 valence, which eliminates the disproportionation reaction and Young-Taylor effect caused by it, and has excellent cycle performance and high-rate discharge performance, so it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 郅晓科叶学海刘红光何爱珍章甦赵桢时洁王旭阳
Owner CHINA NAT OFFSHORE OIL CORP
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