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Method for preparing aluminum-doped zinc oxide coated lithium manganese material

An aluminum-doped zinc oxide, lithium-rich manganese technology, applied in the field of nanomaterials, can solve the problems of poor cycle performance and low Coulomb efficiency, and achieve the effects of low equipment requirements, easy synthesis process, and improved transmission performance.

Inactive Publication Date: 2014-12-24
西安中科新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the technical problems of low initial coulombic efficiency and poor cycle performance of existing lithium-rich manganese-based materials, the present invention proposes a preparation method of aluminum-doped zinc oxide-coated lithium-rich manganese materials

Method used

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  • Method for preparing aluminum-doped zinc oxide coated lithium manganese material

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Experimental program
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Embodiment 1

[0032] A preparation method of aluminum-doped zinc oxide coating lithium-rich manganese material, comprising the following steps:

[0033] Step 1) Lithium-rich manganese 0.5Li 2 MnO 3 ·0.5LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 O 2 Preparation of cathode materials

[0034] According to the molecular formula 0.5Li 2 MnO 3 ·0.5LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 O 2 Weigh 10.86g (0.1575mol) of lithium nitrate, 4.83g (0.0166mol) of nickel nitrate, 4.83g (0.0166mol) of cobalt nitrate, 16.37g (0.0668mol) of manganese acetate, and prepare a 500ml of ionic aqueous solution, placed in a constant temperature water bath with a preheating temperature of 70°C, under vigorous stirring, citric acid solution (preparation: 33.1g (0.1575mol) citric acid dissolved in 500ml deionized water) was added dropwise to the metal in salt solution. Subsequently, the pH value was adjusted to about 7.5 with ammonia water, and the solvent was slowly distilled off under the condition of stirring at 90° C. to obtain a green t...

Embodiment 2

[0039] A preparation method of aluminum-doped zinc oxide-coated lithium-rich manganese material, comprising the following steps: the reaction environment and conditions of Example 2 are the same as those of Example 1, the difference is that in step 1), 0.5Li is prepared 2 MnO 3 ·0.5LiMn 1 / 2 Ni 1 / 2 O 2 Lithium-rich manganese cathode material.

[0040] Step 2) 4wt% Al-doped ZnO-coated Li-rich Manganese 0.5Li 2 MnO 3 ·0.5LiMn 1 / 2 Ni 1 / 2 O 2 Preparation of cathode materials

[0041] According to Al(NO 3 ) 3 ·9H 2 O and Zn(CH 3 COO) 2 ·2H 2 O molar ratio of 1:20 and weighed 0.0451g (0.1203mmol) Al(NO 3 ) 3 ·9H 2 O and 0.5281 g (2.4057 mmol) Zn(CH 3 COO) 2 ·2H 2 O was sequentially dissolved in 200 ml of deionized water. 100ml of 15% polyvinylpyrrolidone K30 or tartaric acid aqueous solution was added dropwise, stirred for 1h, doped with ZnO and 0.5Li according to Al 2 MnO 3 ·0.5LiMn 1 / 2 Ni 1 / 2 O 2 The mass ratio is 1:25 to weigh 5g0.5Li 2 MnO 3 ·0.5LiMn ...

Embodiment 3

[0043] A preparation method of aluminum-doped zinc oxide-coated lithium-rich manganese material, comprising the following steps: the reaction environment and conditions of Example 3 are the same as those of Example 1, the difference is that in step 1), 0.4Li is prepared 2 MnO 3 ·0.6LiNi 1 / 2 Mn 1 / 2 O 2 Lithium-rich manganese cathode material.

[0044] Step 2) 3wt% Al-doped ZnO-coated Li-rich Manganese 0.4Li 2 MnO 3 ·0.6LiNi 1 / 2 Mn 1 / 2 O 2 Preparation of cathode materials

[0045] According to Al(NO 3 ) 3 ·9H 2 O and Zn(CH 3 COO) 2 ·2H 2 O mole ratio 1:25, weigh 0.0272g (0.0725mmol) Al(NO 3 ) 3 ·9H 2 O and 0.398 g (1.8133 mmol) Zn(CH 3 COO) 2 ·2H 2 O was sequentially dissolved in 200 ml of deionized water. 100ml of 15% polyvinylpyrrolidone K30 or tartaric acid aqueous solution was added dropwise, stirred for 1h, doped with ZnO and 0.4Li according to Al 2 MnO 3 ·0.6LiNi 1 / 2 Mn 1 / 2 O 2 The mass ratio is 3:100 to weigh 5g of 0.4Li 2 MnO 3 ·0.6LiNi 1 / 2 M...

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Abstract

The invention discloses a method for preparing an aluminum-doped zinc oxide coated lithium manganese material. The method includes the steps of preparing a precursor of a lithium manganese positive electrode material and calcining the precursor of the lithium manganese positive electrode material in a muffle furnace for obtaining the lithium manganese positive electrode material; dissolving soluble aluminum salt and soluble zinc salt in an aqueous solution, adding polyvinylpyrrolidone and the lithium manganese positive electrode material sequentially, and stirring at constant temperature for obtaining a precursor solution; drying the precursor solution at constant temperature in air and calcining the dried precursor in air for obtaining the aluminum-doped zinc oxide coated lithium manganese material. The method for preparing the aluminum-doped zinc oxide coated lithium manganese material is simple and easy to implement, low in requirement on equipment and pollution-free in the reaction and has a good prospect on industrial application.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and particularly relates to a preparation method of a positive electrode material for a lithium ion secondary battery. Background technique [0002] With the rapid development of science and technology, lithium-ion batteries have been widely used in mobile phones, notebook computers and instrumentation. In recent years, the development of new energy electric vehicles, hybrid electric vehicles and energy storage has put forward higher requirements for lithium-ion batteries. It makes people urgently seek new and replaceable cathode materials for lithium-ion batteries. [0003] Lithium-rich manganese-based materials and currently used LiCoO 2 , LiMn 2 O 4 , LiFePO 4 and LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 O 2 Compared with other materials, it has higher specific capacity, larger energy density and better cycle performance, so it has been the focus of researchers. However, the material's low first...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCH01M4/366H01M4/505H01M4/62H01M10/0525Y02E60/10
Inventor 徐士民李宏斌马毅宋静静徐一丹都云刘志坚陈俊桦
Owner 西安中科新能源科技有限公司
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