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Method for improving electrochemical performance of lithium nickel manganese oxide by utilization of 4,4'-dihydroxydiphenylsulfone

A dihydroxydiphenyl sulfone, electrochemical technology, applied in the field of lithium-ion battery cathode materials, can solve the problems of poor rate performance, poor cycle performance, fast capacity decay, etc., achieve strong electron donating ability, low cost, and alleviate corrosion Effect

Inactive Publication Date: 2017-04-19
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiNi 0.5 mn 1.5 o 4 The material also has its own shortcomings, mainly manifested in the fact that under high voltage, the HF generated by the decomposition of the electrolyte will cause the dissolution of Mn ions in the material, and at the same time, side reactions will also occur between the electrode surface and the interface formed by the electrolyte, resulting in LiNi 0.5 mn 1.5 o 4 The poor cycle performance, fast capacity decay and poor rate performance limit its further application. Recent studies have found that through the LiNi 0.5 mn 1.5 o 4 Material modification can effectively improve its electrochemical performance

Method used

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  • Method for improving electrochemical performance of lithium nickel manganese oxide by utilization of 4,4'-dihydroxydiphenylsulfone
  • Method for improving electrochemical performance of lithium nickel manganese oxide by utilization of 4,4'-dihydroxydiphenylsulfone
  • Method for improving electrochemical performance of lithium nickel manganese oxide by utilization of 4,4'-dihydroxydiphenylsulfone

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 0.0206g of 4,4'-dihydroxydiphenyl sulfone and dissolve it in 5g of N-methylpyrrolidone to obtain solution A. Weigh 2.003g LiNi 0.5 mn 1.5 o 4 Materials, added to solution A, magnetically stirred and mixed for a period of time and then dried to obtain 4,4'-dihydroxydiphenylsulfone@LiNi 0.5 mn 1.5 o 4 composite material. Put 1.6g of positive electrode composite material, 0.2g of PVDF and 0.2g of SP conductive agent into a ball mill tank, then add a certain amount of N-methylpyrrolidone, and then ball mill for 5h under the condition of 300r / min, the slurry of composite positive electrode material , where 4,4′-dihydroxydiphenylsulfone and LiNi 0.5 mn 1.5 o 4 The mass percentage ratio is 1%:99%.

Embodiment 2

[0029] Weigh 0.0403g of 4,4'-dihydroxydiphenyl sulfone and dissolve it in 5g of N-methylpyrrolidone to obtain solution A. Weigh 2.005g LiNi 0.5 mn 1.5 o 4 Materials, added to solution A, magnetically stirred and mixed for a period of time and then dried to obtain 4,4'-dihydroxydiphenylsulfone@LiNi 0.5 mn 1.5 o 4composite material. Put 1.6g of positive electrode composite material, 0.2g of PVDF and 0.2g of SP conductive agent into a ball mill tank, then add a certain amount of N-methylpyrrolidone, and then ball mill for 5h under the condition of 300r / min, the slurry of composite positive electrode material , where 4,4′-dihydroxydiphenylsulfone and LiNi 0.5 mn 1.5 o 4 The mass percent composition ratio is 2%:98%.

Embodiment 3

[0031] Weigh 0.0601g of 4,4'-dihydroxydiphenyl sulfone and dissolve it in 5g of N-methylpyrrolidone to obtain solution A. Weigh 2.001g LiNi 0.5 mn 1.5 o 4 Materials, added to solution A, magnetically stirred and mixed for a period of time and then dried to obtain 4,4'-dihydroxydiphenylsulfone@LiNi 0.5 mn 1.5 o 4 composite material. Put 1.6g of positive electrode composite material, 0.2g of PVDF and 0.2g of SP conductive agent into a ball mill tank, then add a certain amount of N-methylpyrrolidone, and then ball mill for 5h under the condition of 300r / min, the slurry of composite positive electrode material , where 4,4′-dihydroxydiphenylsulfone and LiNi 0.5 mn 1.5 o 4 The mass percentage ratio is 3%:97%.

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Abstract

The invention provides a method for improving electrochemical performance of lithium nickel manganese oxide by the utilization of 4,4'-dihydroxydiphenylsulfone. By low-speed mechanical milling of 4,4'-dihydroxydiphenylsulfone and lithium nickel manganese oxide (LiNi0.5Mn1.5O4) for compounding, a 4,4'-dihydroxydiphenylsulfone (at) LiNi0.5Mn1.5O4 composite material is formed. According to the prepared composite material, specific capacity and cyclic stability are both enhanced. In addition, the technology is simple and convenient to operate. By the method, it is easy to realize large-scale production.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a method for improving LiNi by using 4,4'-dihydroxydiphenyl sulfone 0.5 mn 1.5 o 4 A method for the electrochemical performance of Li-ion cathode materials. Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries have the advantages of small weight, high energy density, long cycle life, high working voltage, no memory effect, and no environmental pollution. They have been widely used in portable electronics such as mobile phones, notebook computers, and cameras. Among the equipment, it is also the preferred power source for electric vehicles and hybrid electric vehicles in the future, and has broad application prospects. Lithium-ion battery cathode material lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) compared to other commercial cathode materials such as lithium cobalt oxide (3.9V ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 范未峰邓春晓王国冬瞿美臻
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI