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a mos 2 /c/livpo 4 f Composite cathode material and preparation method thereof

A composite positive electrode material and composite material technology, which is applied in the field of lithium ion battery materials, can solve the problems of poor high-temperature cycle stability of lithium vanadium phosphate positive electrode materials, and achieve the effect of improving electronic conductivity, good electronic conductivity, and stable performance

Active Publication Date: 2017-12-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the deficiencies of the prior art and provide a new type of MoS that can solve the problem of poor high-temperature cycle stability of lithium vanadium phosphate cathode materials 2 / C / LiVPO 4 F composite cathode material and preparation method thereof

Method used

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  • a mos <sub>2</sub> /c/livpo <sub>4</sub> f Composite cathode material and preparation method thereof
  • a mos <sub>2</sub> /c/livpo <sub>4</sub> f Composite cathode material and preparation method thereof
  • a mos <sub>2</sub> /c/livpo <sub>4</sub> f Composite cathode material and preparation method thereof

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Embodiment 1

[0042] A kind of MoS of the present invention 2 / C / LiVPO 4 F composite cathode material, multilayer core-shell structure, with LiVPO 4 F is the inner core, the middle layer is amorphous carbon, and the outermost layer is MoS 2 ;MoS 2 The mass accounted for LiVPO 4 2 wt% of the mass of F; the mass of amorphous carbon accounts for LiVPO 4 1.56 wt% of F mass.

[0043] MoS of this example 2 / C / LiVPO 4 The preparation method of F composite cathode material, comprises the following steps:

[0044] (1) Preparation of C / LiVPO coated with amorphous carbon by mechanical activation 4 F composite material; the mass of C in the synthesized composite cathode material accounted for LiVPO 4 1.56 wt% of F mass.

[0045] (2) Dissolve ammonium molybdate and thiourea in distilled water to prepare a solution, and react in a reactor at 180 °C for 20 h to synthesize layered MoS 2 .

[0046] (3) The layered MoS prepared in step (2) 2 , slowly added to the alcohol, accompanied by continuo...

Embodiment 2

[0054] A kind of MoS of the present invention 2 / C / LiVPO 4 F composite cathode material, multilayer core-shell structure, with LiVPO 4 F is the inner core, the middle layer is amorphous carbon, and the outermost layer is MoS 2 .

[0055] MoS of this example 2 / C / LiVPO 4 The preparation method of F composite cathode material, comprises the following steps:

[0056] (1) Preparation of C / LiVPO coated with amorphous carbon by mechanical activation 4 F composite material; the mass of C in the synthesized composite cathode material accounted for LiVPO 4 1.3 wt% of F mass.

[0057] (2) Dissolve ammonium molybdate and thiourea in distilled water to prepare a solution, and react in a reactor at 180°C for 16 hours to synthesize layered MoS 2 .

[0058] (3) The layered MoS prepared in step (2) 2 , slowly added to the alcohol, accompanied by continuous stirring and ultrasonic assistance during the addition process, continued ultrasonic assisted oscillation for 1 hour after the a...

Embodiment 3

[0067] A kind of MoS of the present invention 2 / C / LiVPO 4 F composite material, a multilayer core-shell structure, with LiVPO 4 F is the inner core, the middle layer is amorphous carbon, and the outermost layer is MoS 2 ;MoS 2 The mass accounted for LiVPO 4 2 wt% of the mass of F; the mass of amorphous carbon accounts for LiVPO 4 2.0 wt% of F mass.

[0068] MoS of this example 2 / C / LiVPO 4 The preparation method of F composite material, comprises the following steps:

[0069] (1) Preparation of C / LiVPO coated with amorphous carbon by mechanical activation 4 F composite material; the mass of C in the synthesized composite cathode material accounted for LiVPO 4 2.0 wt% of F mass.

[0070] (2) Dissolve ammonium molybdate and thiourea in distilled water to prepare a solution, and react in a reactor at 220°C for 14 hours to synthesize layered MoS 2 .

[0071] (3) The layered MoS prepared in step (2) 2 , slowly added to the alcohol, accompanied by continuous stirring a...

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Abstract

The invention discloses a MoS2 / C / LiVPO4F composite anode material. The MoS2 / C / LiVPO4F composite anode material is of a multilayer core-shell structure; and in the composite anode material, LiVPO4F is taken as an inner core, amorphous carbon is taken as a middle layer, and MoS2 is taken as an outermost layer. The preparation method disclosed by the invention comprises the following steps: firstly preparing a C / LiVPO4F composite material with a mechanical activation method; then coating a platelike MoS2 layer on the surface of the C / LiVPO4F composite material with a solution method combined with a low-temperature roasting method, so that the MoS2 / C / LiVPO4F composite anode material is obtained. According to the MoS2 / C / LiVPO4F composite anode material and the preparation method thereof, conductor molybdenum disulfide is coated on the surfaces of LiVPO4F particles, so that the phenomenon that the improvement on the electronic conductivity of the amorphous carbon for LiVPO4F under high-temperature conditions is not obvious is improved, the electronic conductivity of the LiVPO4F solid particles under high-temperature conditions are improved, the interface stability under high-temperature conditions is improved, and thus the material high-temperature cycle performance is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a MoS with a multilayer core-shell structure 2 / C / LiVPO 4 F composite cathode material and its preparation method. Background technique [0002] In recent years, lithium-ion batteries have been widely studied by scientific researchers for their lightness and high efficiency, long cycle life, good safety performance, no memory effect, and no pollution, and have been gradually applied to mobile phones, notebook computers, players, and electric vehicles. and other fields. As a key factor of lithium-ion batteries, cathode materials directly affect the overall performance of lithium-ion batteries. Lithium-ion batteries used in electronic products sometimes inevitably need to be used at higher temperatures. Therefore, the high temperature performance of the cathode material is the basic condition for the practical application of the material. Research on the improvemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 王接喜刘朝孟彭文杰王志兴范玉磊郭华军李新海胡启阳
Owner CENT SOUTH UNIV
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