High-capacity lithium ion battery anode material 0.5Li2MnO3*0.5LiMn1/3Ni1/3Co1/3O2 and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large initial capacity loss, voltage drop, and poor rate performance, and achieve simple, fast and convenient reaction process and low capacity loss , the effect of increasing energy density

Inactive Publication Date: 2015-03-25
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] In recent years, manganese-based layered lithium-rich oxide xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Ni, Co, Ni 1 / 2 mn 1 / 2 , Ni 1 / 3 mn 1 / 3 co 1 / 3 etc.) has attracted widespread attention, because the lithium intercalation capacity of this material in the range of 2-4.8V can be as high as 250mAh / g or more, which can provide both high voltage and high capacity to improve energy density, and mainly contains resources Rich manganese, low cost, but this kind of material has problems such as large initial capacity loss, poor rate performance and voltage drop

Method used

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  • High-capacity lithium ion battery anode material 0.5Li2MnO3*0.5LiMn1/3Ni1/3Co1/3O2 and preparation method thereof
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  • High-capacity lithium ion battery anode material 0.5Li2MnO3*0.5LiMn1/3Ni1/3Co1/3O2 and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] A kind of anode material 0.5Li for high-capacity lithium-ion battery 2 MnO3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 The preparation method comprises the following steps:

[0031] (1) Under stirring conditions, add 80mL deionized water to a 250mL high-necked beaker, then add 5.2g lithium acetate dihydrate, 5.2g manganese acetate tetrahydrate, 1.3g nickel acetate tetrahydrate and 1.3g acetic acid tetrahydrate For cobalt, fully stir for 30 minutes and then heat up to 55°C to completely dissolve the metal salt to obtain a metal salt solution;

[0032] (2) Under continuous mechanical stirring, add 10 g of PEG to the metal salt solution obtained in step (1), and then continue to stir for 30 minutes to obtain reaction solution A, and the average relative molecular weight of the PEG is 2000;

[0033] (3) Under continuous mechanical stirring, slowly add 50 mL of 15% H in the reaction solution A obtained in step (2). 2 C 2 o 4 solution, and then raise the temperature to 90°C, and r...

Embodiment 2

[0036] A kind of anode material 0.5Li for high-capacity lithium-ion battery 2 MnO 3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 The preparation method comprises the following steps:

[0037] (1) Under stirring conditions, add 60 mL of deionized water to a 250 mL high-necked beaker, then add 5.2 g of lithium acetate dihydrate, 5.2 g of manganese acetate tetrahydrate, 1.3 g of nickel acetate tetrahydrate and 1.3 g of acetic acid tetrahydrate For cobalt, fully stir for 30 minutes and then heat up to 55°C to completely dissolve the metal salt to obtain a metal salt solution;

[0038] (2) Under continuous mechanical stirring, add 10 g of PEG to the metal salt solution obtained in step (1), and then continue to stir for 30 min to obtain reaction solution A, at which time the average relative molecular weight of PEG is 400;

[0039] (3) Under continuous mechanical stirring, slowly add 50 mL of 15% H in the reaction solution A obtained in step (2). 2 C 2 o 4 solution, and then raise the te...

Embodiment 3

[0042] A kind of anode material 0.5Li for high-capacity lithium-ion battery 2 MnO 3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 The preparation method comprises the following steps:

[0043] (1) Under stirring conditions, add 70mL deionized water to a 250mL high-necked beaker, then add 5.2g lithium acetate dihydrate, 5.2g manganese acetate tetrahydrate, 1.3g nickel acetate tetrahydrate and 1.3g acetic acid tetrahydrate For cobalt, fully stir for 30 minutes and then heat up to 55°C to completely dissolve the metal salt to obtain a metal salt solution;

[0044] (2) Under continuous mechanical stirring, add 15g PEG to the metal salt solution obtained in step (1), then continue stirring for 30min to obtain reaction solution A, and the average relative molecular weight of PEG is 600 now;

[0045] (3) Under continuous mechanical stirring, slowly add 50 mL of 15% H in the reaction solution A obtained in step (2). 2 C 2 o 4 solution, and then raise the temperature to 90°C, and react for 12...

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Abstract

The invention discloses a high-capacity lithium ion battery anode material 0.5Li2MnO3*0.5LiMn1/3Ni1/3Co1/3O2 and a preparation method thereof. The preparation method includes the steps: adding lithium salt, manganese salt, nickel salt and cobalt salt into distilled water according to a weight ratio, stirring and heating the salt and the distilled water and completely dissolving metal salt; adding polyethylene glycol and H2C2O4 solution, and performing temperature reaction to obtain pink deposit; heating the deposit to reach 450-500 DEG C after vacuum drying, keeping the constant temperature for 3-5h, taking out the mixture, uniformly grinding and pressing the mixture after cooling, heating the mixture again to reach 800-1000 DEG C and keeping the constant temperature for 8-12h. The high-capacity lithium ion battery anode material 0.5Li2MnO3*0.5LiMn1/3Ni1/3Co1/3O2 obtained by the preparation method is low in first irreversible capacity loss, high in charge-discharge capacity and fine in cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to a 0.5Li positive electrode material for high-capacity lithium-ion batteries 2 MnO 3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 and its preparation method. Background technique [0002] Fossil fuels are the foundation of today's energy economy. With rising oil demand, depletion of non-renewable resources, political turmoil in oil-exporting countries, and excessive carbon dioxide emissions, pollution and traffic congestion in big cities caused by vehicle exhaust are becoming more and more prominent. We urgently need Find more advanced clean energy. Lithium-ion batteries are favored because of their advantages such as high voltage, high energy density, long cycle life, and less environmental pollution. In my country's "Twelfth Five-Year Plan" development plan, under the key policy support of the "new energy" and "new materials" industry sectors, with the rapid development of electronic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/505H01M4/525H01M4/62
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李伟善陈敏黄启明陈东瑞钟晓欣
Owner SOUTH CHINA NORMAL UNIVERSITY
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