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Manganese-base carbon-coated nano lithium-rich oxide and preparation method as well as application thereof

A carbon nano and oxide technology, which is applied in the field of manganese-based carbon-coated nano-lithium-rich oxide and its preparation, can solve the problems of difficult to achieve uniform coating, large initial capacity loss, poor rate performance, etc., and achieve a simple and fast reaction process Convenience, improved electrochemical performance, and improved electronic conductivity

Active Publication Date: 2016-06-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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, and it is currently the cathode material with the highest capacity in the transition metal system, and it mainly contains abundant manganese. , low cost and good safety performance, but this kind of material has problems such as large initial capacity loss, poor rate performance and voltage drop.
In order to solve these problems, people have adopted many methods. Among them, coating carbon is a relatively common and effective method to improve the performance of materials, but the method is basically to coat carbon on the surface of the material after the material is prepared. This method is more complicated and Coating is difficult to achieve a uniform effect, so the preparation of uniformly coated carbon layered lithium-rich materials with a simple process is one of the key research directions to improve the performance of lithium-ion batteries

Method used

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  • Manganese-base carbon-coated nano lithium-rich oxide and preparation method as well as application thereof
  • Manganese-base carbon-coated nano lithium-rich oxide and preparation method as well as application thereof
  • Manganese-base carbon-coated nano lithium-rich oxide and preparation method as well as application thereof

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Effect test

Embodiment 1

[0025] The preparation method of a manganese-based carbon-coated nano-lithium-rich oxide in this embodiment, the specific preparation steps are as follows:

[0026] (1) Under stirring conditions, add 200mL of DMF to a 500mL high-necked beaker, then add 0.2g of PVP and stir for 30min until the PVP is completely dissolved in DMF.

[0027] (2) Under continuous mechanical stirring, add lithium acetate dihydrate, manganese acetate tetrahydrate, nickel acetate tetrahydrate and cobalt acetate tetrahydrate in a molar ratio of 1.26:0.54:0.13:0.13 to step (1) to obtain a metal salt solution.

[0028] (3) Under continuous mechanical stirring, the temperature of the solution obtained in (2) was raised to 80° C., and reacted for 12 hours to obtain a gel.

[0029] (4) Send the gel obtained in step (3) into a muffle furnace to raise the temperature to 450° C., keep the temperature constant for 5 hours, and take out the tablet after cooling.

[0030] (5) The pressed sheet in (4) is heated to...

Embodiment 2

[0032] The preparation method of a manganese-based carbon-coated nano-lithium-rich oxide in this embodiment, the specific preparation steps are as follows:

[0033] (1) Under stirring conditions, add 200mL of DMF into a 500mL high-necked beaker, then add 1g of PVP and stir for 30min until the PVP is completely dissolved in DMF.

[0034] (2) Under continuous mechanical stirring, add lithium acetate dihydrate, manganese acetate tetrahydrate, nickel acetate tetrahydrate and cobalt acetate tetrahydrate in a molar ratio of 1.26:0.54:0.13:0.13 to step (1) to obtain a metal salt solution.

[0035] (3) Under continuous mechanical stirring, the temperature of the solution obtained in (2) was raised to 80° C., and reacted for 12 hours to obtain a gel.

[0036] (4) Send the gel obtained in step (3) into a muffle furnace to raise the temperature to 450° C., keep the temperature constant for 5 hours, and take out the tablet after cooling.

[0037] (5) The pressed sheet in (4) is heated to...

Embodiment 3

[0039] The preparation method of a manganese-based carbon-coated nano-lithium-rich oxide in this embodiment, the specific preparation steps are as follows:

[0040] (1) Under stirring conditions, add 200mL of DMF into a 500mL high-necked beaker, then add 2g of PVP and stir thoroughly for 30min until PVP is completely dissolved in DMF.

[0041] (2) Under continuous mechanical stirring, add lithium acetate dihydrate, manganese acetate tetrahydrate, nickel acetate tetrahydrate and cobalt acetate tetrahydrate in a molar ratio of 1.26:0.54:0.13:0.13 to step (1) to obtain a metal salt solution.

[0042] (3) Under continuous mechanical stirring, the temperature of the solution obtained in (2) was raised to 80° C., and reacted for 12 hours to obtain a gel.

[0043] (4) Send the gel obtained in step (3) into a muffle furnace to raise the temperature to 450° C., keep the temperature constant for 5 hours, and take out the tablet after cooling.

[0044] (5) The pressed sheet in (4) is he...

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Abstract

The invention belongs to the technical field of lithium batteries, and discloses a manganese-base carbon-coated nano lithium-rich oxide and a preparation method as well as an application thereof. The preparation method comprises the following steps: under a condition of stirring, dissolving PVP in DMF, then, adding lithium acetate dihydrate, manganous acetate tetrahydrate, nickel acetate tetrahydrate and cobaltous acetate tetrahydrate according to a molar ratio of 1.26:0.54:0.13:0.13, stirring and dissolving evenly to obtain a metal salt solution; then, heating up the metal salt solution to 60-120 DEG C to carry out constant temperature treatment for 10-24 hours, thereby obtaining a gel-like object; heating up the gel-like object in the air to 400-500 DEG C to carry out constant temperature treatment for 3-8 hours, cooling naturally, then taking out and performing tablet compressing, and sintering for 7-12 hours at the temperature of 800-1000 DEG C to obtain a product. According to the invention, the preparation method is simple, problems, such as hydrolysis and aggregation of transition metal ions, are avoided, and the obtained product has good electrochemical performance when being used as a lithium ion battery positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to a manganese-based carbon-encapsulated nano-lithium-rich oxide and a preparation method and application thereof. Background technique [0002] With the gradual depletion of global fossil energy, environmental pollution is increasing, global energy and environmental problems are extremely severe, and the contradiction between economic growth and resources and environment is becoming more and more prominent, which poses a huge challenge to the sustainable development of human society. We urgently need to find Renewable clean energy. Lithium-ion batteries are favored because of their advantages such as high energy density, long cycle life, and low environmental pollution. As the most critical material in current lithium-ion batteries, the development of cathode materials is also receiving the most attention. In recent years, manganese-based layered lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/505H01M10/0525
CPCH01M4/366H01M4/505H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 李伟善陈敏黄启明廖友好陈东瑞钟晓欣田源源
Owner SOUTH CHINA NORMAL UNIVERSITY
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