Preparation method of one-dimensional nanowire type lithium manganate positive electrode material

A linear lithium manganate, cathode material technology, applied in the direction of positive electrode, nanotechnology, nanotechnology, etc., can solve the problems of poor rate performance, poor cycle performance, etc., achieve good discharge performance, easy operation, and increase the contact area. Effect

Inactive Publication Date: 2017-12-05
湖南电将军新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of poor cycle performance and poor rate performance of lithium manganese oxide positive electrode materials used in existing lithium batteries, the present invention provides a method for preparing a one-dimensional nanowire-type lithium manganate positive electrode material. The prepared one-dimensional nanowire-type manganese Lithium oxide is used as the positive electrode material of lithium-ion batteries, and has good cycle performance. The preparation method of the material is simple, easy to operate, and easy to industrialized production

Method used

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  • Preparation method of one-dimensional nanowire type lithium manganate positive electrode material
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  • Preparation method of one-dimensional nanowire type lithium manganate positive electrode material

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Embodiment 1

[0031] Weigh Mn(CH 3 COO) 2 4H 2 O, (NH 4 ) 2 S 2 o 8 and (NH4) 2 SO 4 and added to a 100mL beaker. Then add 60 mL of deionized water to the beaker, place the beaker on a stirrer and stir for two minutes to completely dissolve the solids. The homogeneously mixed solution was transferred to a 100mL reaction kettle. Tighten the reaction kettle and put it into an electric blast drying oven, set it at 140°C, and heat it for 12 hours to obtain nanowire-shaped α-MnO 2 . and the obtained α-MnO 2 Wash and dry in deionized water and ethanol solution respectively (100°C, 12h). The prepared α-MnO was washed alternately with deionized water and absolute ethanol for 6 times. 2 , Centrifuge the mixed suspension with a centrifuge, and suck up the waste liquid with a pipette. After washing, the samples were dried in an electric blast drying oven (60 °C, 10 h). The dried α-MnO 2 Grind for 5min. Weigh lithium hydroxide monohydrate and α-MnO according to the molar ratio of 1:2 ...

Embodiment 2

[0036]In this embodiment, when the prepared nanowire-type lithium manganese oxide is applied to a lithium-ion battery, the lithium-ion battery includes a negative electrode of the battery, an electrolyte, and a positive electrode of the battery;

[0037] When preparing the positive electrode sheet, lithium manganate, conductive agent A is super-p acetylene black, conductive agent B is carbon nanotube, binder is PVDF (polyvinylidene fluoride), by mass percentage: positive electrode active material 92%, conductive Agent A3%, conducting agent B1%, binding agent 4% are equipped with each composition (positive electrode active material+conducting agent A+conducting agent B+binding agent=100%);

[0038] When preparing the negative electrode sheet, commercial graphite was used as the active material, and the conductive agent was super-p acetylene black, in terms of mass percentage: 96% of commercial graphite and 4% of super-p acetylene black.

[0039] Electrolyte solvent is EC, DEC, ...

Embodiment 3

[0041] In this embodiment, when the prepared nanowire-type lithium manganese oxide is applied to a lithium-ion battery, the lithium-ion battery includes a negative electrode of the battery, an electrolyte, and a positive electrode of the battery;

[0042] When preparing the positive electrode sheet, lithium manganate, conductive agent A is super-p acetylene black, conductive agent B is carbon nanotubes, and binder is PVDF (polyvinylidene fluoride), by mass percentage: positive electrode active material 94%, conductive 3.5% of agent A, 1% of conductive agent B, and 1.5% of binding agent are prepared to form each composition (positive electrode active material+conducting agent A+conducting agent B+binding agent=100%);

[0043] When preparing the negative electrode sheet, commercial graphite is used as the active material, and the conductive agent is super-p acetylene black, in terms of mass percentage: 97% of commercial graphite and 3% of super-p acetylene black.

[0044] The el...

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Abstract

The invention relates to a lithium ion battery material, and concretely relates to a preparation method of a one-dimensional nanowire type lithium manganate positive electrode material. The preparation method comprises the following steps: 1, preparing a manganese source compound solution, and adding an additive; 2, processing the prepared manganese source compound solution through a hydrothermal technology to obtain nanowire type alpha-MnO2, and washing and drying the nanowire type alpha-MnO2; and 3, mixing, stirring and drying the nanowire type alpha-MnOw, a lithium source compound and a solvent. The initial discharge capacity of the spinel structured LiMn2O4 nanowire prepared through the method is 104.8 mAh / g during1C rate charge and discharge. 87.6% Of the initial capacity is still kept at 150 cycles. 75% Of the initial capacity is kept during 3 C rate charge and discharge.

Description

technical field [0001] The invention relates to a lithium ion battery material, in particular to a preparation method of a one-dimensional nanowire type lithium manganate positive electrode material. Background technique [0002] At present, the problem of air pollution in our country is becoming more and more serious. One of the main sources of air pollution in our country is various means of transportation. In cities, especially in big cities, the number of cars is large and concentrated, and the pollutants emitted by exhaust gas become the main source of air in big cities. one of the sources of pollution. The exhaust gas emitted by automobiles is mainly carbon monoxide, sulfur dioxide, nitrogen oxides and hydrocarbons, etc., which can induce chronic bronchitis, bronchitis, emphysema and other respiratory diseases. Air pollution has seriously endangered people's health. Reducing exhaust emissions is the main way to reduce air pollution, so how to reduce the burning of fos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/505H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G45/1235C01P2002/72C01P2004/04C01P2004/62C01P2006/40H01M4/505H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 陈立宝崔超韦伟峰
Owner 湖南电将军新能源有限公司
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