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Preparation method of BiOF-coated lithium nickel manganese oxide anode material

A cathode material, lithium nickel manganese oxide technology, applied in the field of waste gas treatment, can solve problems such as poor cycle stability, and achieve the effect of improving cycle stability performance

Inactive Publication Date: 2018-03-27
LUOYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The researchers focused on the electrochemical performance of materials with different particle sizes at 25 and 55°C. The research showed that powders with lower synthesis temperatures and smaller particle sizes exhibited higher capacity, but powders with smaller particle sizes showed lower capacity. Poor cycle stability, the material processed at 750°C is cycled less than 40 times at 55°C and the specific capacity drops below 80mAh / g

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Take by weighing 0.37g nickel oxide, 1.75g ​​manganese carbonate and 0.82g lithium carbonate, put the three into a ball mill, then add 0.67g graphite powder, stir the above-mentioned four kinds of materials, obtain mixture one, and then Add zirconia balls to the mixture 1, wherein the mass ratio of the zirconia balls to the mixture 1 is 12:1, and the ball milling speed is 300r / min for 5h to obtain a uniform mixture 2;

[0021] (2) Put the ball-milled mixture 2 into an oven for sintering, first raise the temperature to 500°C for 1h, then raise the temperature to 900°C for 3h, and cool naturally to room temperature after sintering to obtain lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 Cathode material;

[0022] (3) Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, and citric acid solution with a mass fraction of 15% and ammonium fluoride crystals (NH 4 F), the pH is adjusted to 8-9 with ammonia water, wherein, citric acid, ammonium fluoride crystals, B...

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Abstract

The invention discloses a preparation method of a BiOF-coated lithium nickel manganese oxide LiNi0.5Mn1.5O4 anode material. The method comprises the steps of adopting nickel oxide, manganese carbonateand lithium carbonate as raw materials, adding graphite powder, sintering after ball-milling to obtain the lithium nickel manganese oxide LiNi0.5Mn1.5O4 anode material; then dissolving Bi(NO3)3.5H2Ointo deionized water, adding a citric acid solution and an ammonium fluoride crystal, and adjusting pH to be 8 to 9 by using ammonium hydroxide; mixing lithium nickel manganese oxide LiNi0.5Mn1.5O4 anode material powder and a prepared Bi(O3)3 mixed solution, and sintering after drying to obtain BiOF-coated lithium nickel manganese oxide LiNi0.5Mn1.5O4 anode material powder. After the BiOF-coated lithium nickel manganese oxide LiNi0.5Mn1.5O4 anode material is cycled for 100 times, the specific capacity retention rate is 88.9 percent, and a circulatory stability performance of the lithium nickelmanganese oxide LiNi0.5Mn1.5O4 anode material is greatly improved.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a BiOF-coated lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 Preparation method of cathode material. Background technique [0002] With the development of electric vehicles, the requirements for electrode materials are getting higher and higher, especially for cathode materials. Lithium nickel manganese oxide cathode materials have a higher voltage platform, so they have broad application prospects as power battery materials. At present, the lithium nickel manganese oxide material has the problem of poor electrochemical cycle performance in use. In order to solve this problem, the current research mainly focuses on the doping of metal ions to replace part of the manganese ions, and the voltage of the lithium nickel manganese oxide material will change after doping with different elements. [0003] The doping of lithium nickel manganese oxide includes metal ion...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M2004/028Y02E60/10
Inventor 李晓凤陶亚萍韩礼刚赵阿珂杜军毅
Owner LUOYANG NORMAL UNIV