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A kind of preparation method of laminated lithium nickel manganese oxide

A technology of lithium nickel manganate and manganese salt is applied in the field of preparation of layered positive electrode materials, which can solve the problems of high process cost, high risk and difficulty, and achieve the advantages of easy popularization and implementation, cheap raw materials, and avoiding the existence of low-priced manganese. Effect

Active Publication Date: 2017-05-17
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is too difficult to develop new electrode materials, and the process cost and risk are high. Therefore, designing electrode material structures that are conducive to electron transport and nano-materials are the most common methods to solve the problem of rapid charging and discharging of batteries (see: Jiantie Xu, Shixue Dou, HuakunLiu, et al. Cathode materials for next generation lithium ion batteries[J]. Nano Energy, 2013, 2: 439–442)

Method used

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  • A kind of preparation method of laminated lithium nickel manganese oxide
  • A kind of preparation method of laminated lithium nickel manganese oxide

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preparation example Construction

[0014] The present invention is a kind of preparation method of laminated lithium nickel manganese oxide material, and its steps are:

[0015] (1) At room temperature, dissolve the manganese salt in a mixture of alcohol and water at a ratio of 1:9-1:1. The molar concentration of manganese ions in the aqueous alcohol solution is 0.3-1.5 mol / L. In the above mixed solution Lithium salt is directly added to the solution; the amount of manganese and lithium salt is determined at a molar ratio of 3:2; then, under stirring conditions, hydrogen peroxide whose molar number is 0.4-2 times the molar number of manganese salt is added to the above solution, and a black solution is obtained at this time. ;

[0016] (2) Add nickel salt to the above black solution, the amount of manganese, lithium and nickel salt should be determined according to the molar ratio of 3:2:1, and continue to stir for 1-6 h;

[0017] (3) Heating the obtained solution at 70-100°C to recover the solvent and obtain ...

Embodiment 1

[0024] (1) Dissolve 0.3 mol of manganese sulfate and 0.2 mol of lithium sulfate in a mixture of 1 L of ethanol and water (volume ratio of alcohol to water is 3:9);

[0025] (2) Add 0.12 mol (24 wt%) hydrogen peroxide, then add 0.1 mol nickel acetate, and keep stirring for 3 h;

[0026] (3) The obtained solution is heated at 90°C to recover the solvent and obtain a jelly. Then the jelly was dried in an oven at 120 °C for 8 h;

[0027] (4) Finally, the dried material was calcined in a muffle furnace at 800 °C for 8 h to obtain the following figure 1 , 2 The laminates shown are lithium nickel manganese oxide materials.

Embodiment 2

[0029] (1) Dissolve 0.9 mol of manganese acetate and 0.6 mol of lithium acetate in a mixture of 1 L of ethanol and water (volume ratio of alcohol to water is 1:9);

[0030] (2) Add 0.45 mol (24 wt%) hydrogen peroxide, then add 0.3 mol nickel acetate, and keep stirring for 3 h;

[0031] (3) The obtained solution was heated at 100°C to recover the solvent and obtain a jelly. Then the jelly was dried in an oven at 120 °C for 8 h;

[0032] (4) Finally, the dried material was calcined in a muffle furnace at 850 °C for 9 h to obtain a laminated lithium nickel manganese oxide material.

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Abstract

A preparation method of laminated lithium nickel manganese oxide belongs to the field of a preparation method of a lithium nickel manganese oxide anode material and shape controlling, and comprises the following steps of firstly, dissolving lithium salt and manganese salt into deionized water, and slowly dropwise adding hydrogen peroxide under the condition of stirring, so as to obtain a black solution; adding nickel salt into the solution, and carrying out sol-gel on the solution, so as to obtain a black jelly; drying and burning the jelly, so as to obtain a laminated lithium nickel manganese oxide material. The method is simple in preparation technology, and the raw materials are cheap and easy to obtain; the obtained material has a regular two-dimension laminated structure, and two-dimension laminates are arranged directionally and orderly to form a three-dimension structure, the gaps between every two adjacent layers can enlarge the effective contact area of the anode material and electrolyte, reduce the insertion / extraction resistance of a lithium ion and obviously improve the rate capability of a cell.

Description

technical field [0001] The invention relates to a preparation method of a layered positive electrode material, in particular to a preparation method of a laminated lithium nickel manganese oxide material. Background technique [0002] Lithium-ion batteries have important application prospects in fields such as energy storage systems. With the rapid development of lithium-ion batteries for electric vehicles, people have put forward further requirements for the specific energy density and specific power density of batteries. [0003] Spinel-type lithium nickel manganese oxide has energy density (theoretical value is 1100 Wh / kg, the actual value can be close to 700Wh / kg) and working voltage (the electrode potential is about 4.7 V, vs Li / Li + ) high, stable structure, abundant preparation raw materials, high safety performance, etc., it is a strong competitor for high energy density, high power density lithium-ion battery cathode materials (see: Arumugam Manthiram, Katharine Ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391
CPCH01M4/1391H01M4/505H01M4/525H01M2004/028H01M2220/20Y02E60/10
Inventor 李世友耿珊薛宇宙杜松丽李祥飞唐凤娟赵冬妮李玲霞
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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