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Preparation method of manganese difluoride and graphite nanocomposite for cathode material of lithium ion battery

A technology of lithium-ion batteries and nanocomposites, which is applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effects of simple and safe process, high yield and simple equipment

Inactive Publication Date: 2012-10-10
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In Chinese patents, there is no report of manganese difluoride as an electrode material

Method used

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  • Preparation method of manganese difluoride and graphite nanocomposite for cathode material of lithium ion battery
  • Preparation method of manganese difluoride and graphite nanocomposite for cathode material of lithium ion battery
  • Preparation method of manganese difluoride and graphite nanocomposite for cathode material of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0022] The 50% manganese nitrate solution of 1.7mL is dissolved in 150mL dehydrated alcohol and is made into solution, in this solution, add 3.0g Polyethylene Glycol 2000 as tensio-active agent, stirring and dissolving forms colorless solution, is solution (1 ); Dissolve 2.8g of ammonium fluoride in 150mL of distilled water to form a colorless solution, which is solution (2); gradually add solution (2) dropwise to solution (1) while stirring to form a white precipitate ; The obtained white precipitate was centrifugally washed, dried in a vacuum oven at 80°C to obtain a white powder; the obtained white powder was calcined in a tube furnace, and burned at 420°C under the condition of feeding argon to isolate the air. After 2 hours, manganese difluoride powder was obtained; the obtained manganese difluoride powder was mixed with graphite in a mass ratio of 1:1, and mechanically ball milled for 6 hours under the condition of feeding argon to obtain the negative electrode of lithium...

Embodiment 2

[0025] The 50% manganese nitrate solution of 4.4mL is dissolved in 150mL dehydrated alcohol and is made into solution, in this solution, add 3.0g Polyethylene Glycol 2000 as tensio-active agent, stirring and dissolving forms colorless solution, is solution (1 ); Dissolve 5.6g of ammonium fluoride in 150mL of distilled water to form a colorless solution, which is solution (2); gradually add solution (2) dropwise to solution (1) under vigorous stirring to form a white Precipitation; the obtained white precipitate was centrifuged and washed, and dried in a vacuum oven at 80°C to obtain a white powder; the obtained white powder was calcined in a tube furnace at 420°C under the condition of feeding argon to isolate the air Burn for 2 hours to obtain manganese difluoride powder; mix the obtained manganese difluoride powder with graphite in a mass ratio of 1:1, and mechanically ball mill for 4 hours under the condition of feeding argon to obtain a lithium-ion battery The negative ele...

Embodiment 3

[0029] The 50% manganese nitrate solution of 3.5mL is dissolved in 150mL dehydrated alcohol and is made into solution, in this solution, add 3.0g Polyethylene Glycol 2000 as tensio-active agent, stirring and dissolving forms colorless solution, is solution (1 ); Dissolve 3.3g of ammonium fluoride in 150mL of distilled water to form a colorless solution, which is solution (2); gradually add solution (2) dropwise to solution (1) under vigorous stirring to form White precipitate; the obtained white precipitate was centrifuged and washed, and dried in a vacuum oven at 80°C to obtain a white powder; the obtained white powder was calcined in a tube furnace, and in the case of feeding argon to isolate the air, 420 Burn at ℃ for 4 hours to obtain manganese difluoride powder; mix the obtained manganese difluoride powder with graphite at a mass ratio of 1:1, and mechanically ball mill for 5 hours under the condition of feeding argon gas to obtain lithium ion A nanocomposite of manganese...

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Abstract

The invention provides a preparation method of a manganese difluoride and graphite nanocomposite for a cathode material of a lithium ion battery. The method comprises the following steps of: adding polyethylene glycol 2000 which serves as a surfactant into solution of manganous nitrate and solution of ammonium fluoride which serve as a manganese source and a fluorine source; mixing and stirring at normal temperature so as to produce white deposit; and introducing argon into the deposit in a tubular furnace and calcining under an air-isolated condition so as to obtain manganese difluoride powder. The manganese difluoride prepared by the method has a cubic blocky structure consisting of uniform nanoparticles. When taken as the cathode of the lithium ion battery, the nanocomposite obtained by mixing cubic manganese difluoride and graphite and performing ball milling represents high circulating performance. The method has a moderate preparation condition and simple equipment, and is safe and easy to operate. A synthesis product has high purity and stable property. Charging and discharging tests indicate that the nanocomposite has high electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of manganese difluoride and graphite nanocomposite, which is a cathode material of a lithium ion battery. The manganese difluoride is in the shape of a micron-sized cube, and the cube is composed of nano particles. Background technique [0002] Lithium-ion batteries began to flourish in the 1990s. With the improvement of people's living standards and the popularization of portable electronic products, electric bicycles and microcomputers, people have more and more requirements for green power sources that are light in weight, small in size, high in energy density and long in service life. Lithium-ion batteries are famous for their The unparalleled advantages have become a research hotspot. Fluorine materials have been used in Li-ion batteries for a long time, such as the use of fluoride salts as electrolytes (LiPF 6 ), organic fluoride as binder (PTFE) and (CFx)n as positive electrode material, etc., and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 张礼知尹佳肖利芬
Owner HUAZHONG NORMAL UNIV
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