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Method for preparing hollow high voltage nickel manganese acid lithium anode material

A technology of lithium nickel manganese oxide and positive electrode materials, which is applied in the field of preparation of high voltage lithium nickel manganese oxide positive electrode materials with hollow morphology, can solve the problems of structural stress and volume change, complex preparation process, and uneven materials, and achieve reduction Effect of specific surface area, improvement of cycle performance, and increase of contact area

Active Publication Date: 2015-06-17
南京时拓能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid phase methods include co-precipitation method, sol-gel method and molten salt method, etc., and the preparation process is complex
The preparation process of solid phase method is simple, and it is the best choice for preparing LiNi 0.5 mn 1.5 o 4 The commonly used method is to mix a certain proportion of lithium source, nickel source and manganese source by ball milling, and then calcine. The particle size prepared by this method is large, the material is not uniform, and the high calcination temperature will lead to the appearance of impurities and trivalent manganese.
During the charge-discharge cycle of lithium nickel manganese oxide materials, the repeated deintercalation of lithium will cause structural stress and volume changes, resulting in capacity fading

Method used

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  • Method for preparing hollow high voltage nickel manganese acid lithium anode material
  • Method for preparing hollow high voltage nickel manganese acid lithium anode material
  • Method for preparing hollow high voltage nickel manganese acid lithium anode material

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specific Embodiment approach 1

[0026] Specific embodiment 1: In this embodiment, the lithium nickel manganate material is prepared according to the following steps:

[0027] Prepare 1L 0.04 mol / L manganese sulfate solution, add 100ml absolute ethanol to the solution and stir evenly; then slowly drop 1L 0.4mol / L ammonium bicarbonate solution into the solution while stirring, filter and wash to obtain precipitated carbonic acid Manganese; Put manganese carbonate in a muffle furnace and calcinate at 350℃ for 4 hours to obtain a mixture; put the mixture into 0.1 mol / L hydrochloric acid and stir for 4 hours, filter and wash to obtain manganese dioxide; molar ratio Li:Ni :Mn=1.05:0.5:1.5 Weigh the lithium hydroxide, nickel nitrate and the manganese dioxide obtained in the previous step, and mix them by ball milling for 2 h to obtain the precursor; put the precursor in the air atmosphere of the muffle furnace, and preheat it at 400℃ It is calcined for 6 hours, and then heated to 800°C for 14 hours to obtain lithium n...

specific Embodiment approach 2

[0029] Specific implementation manner 2: In this implementation manner, a lithium nickel manganate material is prepared according to the following steps:

[0030] Prepare 1L 0.16 mol / L manganese sulfate solution, add 200ml of absolute ethanol to the solution, and stir evenly; then slowly add 1L 0.8mol / L ammonium bicarbonate solution to the solution while stirring, filter and wash to obtain precipitated carbonic acid Manganese; Put manganese carbonate in a muffle furnace and calcinate at 300°C for 3 hours to obtain a mixture; put the mixture in 0.2mol / L hydrochloric acid and stir for 2 hours, filter and wash to obtain manganese dioxide; molar ratio LiOH:C 2 H 3 O 2 Li: C 4 H 6 NiO 4 :MnO 2 =0.5:0.5:0.5:1.5 Weigh the lithium hydroxide, lithium acetate, nickel acetate and the manganese dioxide obtained in the previous step, ball mill and mix for 3 h to obtain the precursor; put the precursor in the air atmosphere of the muffle furnace at 500 Pre-calcined at ℃ for 3 h, then heated to ...

specific Embodiment approach 3

[0032] Specific embodiment 3: In this embodiment, the lithium nickel manganate material is prepared according to the following steps:

[0033] Prepare 1L 0.05 mol / L manganese sulfate solution, add 1L 4mol / L ammonium sulfate to the solution and stir evenly; then slowly drop 1L 0.45mol / L ammonium bicarbonate solution into the solution while stirring, and filter and wash to obtain Precipitate manganese carbonate; put manganese carbonate in a muffle furnace and calcinate at 300°C for 5 hours to obtain a mixture; put the mixture into 0.2mol / L sulfuric acid and stir for 2 hours, filter and wash to obtain manganese dioxide; mole ratio LiOH : Ni(NO 3 ) 2 : C 4 H 6 NiO 4 :MnO 2 =1:0.25:0.25:1.5 Weigh lithium hydroxide, nickel nitrate, nickel acetate and the manganese dioxide obtained in the previous step, and disperse them in 20ml of ethanol. Stir at room temperature to evaporate the ethanol to obtain a precursor; put the precursor into In the air atmosphere of the muffle furnace, pre-fir...

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Abstract

The invention discloses a method for preparing hollow high voltage nickel manganese acid lithium anode material, and belongs to the technical field of material synthesis. The method includes the steps that firstly, manganese carbonate is prepared and then calcined under a certain temperature to make the outer shell of the manganese carbonate become manganese dioxide, then, the inner core of the manganese carbonate is dissolved away with dilute acid, the manganese dioxide outer shell is left and mixed with a lithium source and a nickel source, and the hollow nickel manganese acid lithium material is obtained in a calcined mode. The nickel manganese acid lithium material prepared with the method is of a uniform micrometer / nanometer structure and is 1-5um secondary particulates formed by 30-400nm particulates, and primary particulates in small sizes shorten the transmission distance of lithium ions, increase the area of contact between electrodes and electrolytes, and improve the rate capacity. The nickel manganese acid lithium material particulates prepared with the method are of a hollow structure, gaps can buffer structural stress and size changes caused by ithiation, and circulating performance is improved.

Description

Technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a preparation method of a lithium ion battery positive electrode material, in particular to a preparation method of a hollow-shaped high-voltage lithium nickel manganate positive electrode material. Background technique [0002] Energy is closely related to the survival and development of mankind. The demand for energy in modern society is increasing. Realizing the sustainable development of energy is a serious challenge facing mankind. Due to the limited reserves of fossil fuels, the recent oil crisis and global climate change have prompted people to accelerate the development and utilization of new energy sources and convert alternative energy sources such as solar energy, tidal energy, and wind energy into electricity. These new energy sources have the shortcomings of unsustainable power generation and high volatility, and require energy storage systems. On the other hand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 王振波薛原李超张音玉富达刘宝生顾大明尹鸽平
Owner 南京时拓能源科技有限公司
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