Graphene-coated lithium vanadium phosphate cathode material and preparation method thereof

A graphene-coated, lithium vanadium phosphate technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as being unsuitable for large-scale industrial production, unreasonable component distribution and structure, and cumbersome preparation process, and achieving suitable The effect of large-scale industrial production, simple, efficient and reasonable preparation process, and optimized preparation conditions

Active Publication Date: 2016-06-01
HARBIN INST OF TECH
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  • Claims
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Problems solved by technology

[0010] The present invention aims to solve the technical problems that the composition, component distribution and structure of the existing lithium vanadium phosphate / graphene composite material are unreasonable, the preparation process is cumbersome, the raw materials are expensive and difficult to obtain, and the process is not suitable for large-scale industrial production. Graphene-coated lithium vanadium phosphate cathode material and preparation method thereof

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  • Graphene-coated lithium vanadium phosphate cathode material and preparation method thereof
  • Graphene-coated lithium vanadium phosphate cathode material and preparation method thereof
  • Graphene-coated lithium vanadium phosphate cathode material and preparation method thereof

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specific Embodiment approach 1

[0045] Specific Embodiment 1: The graphene-coated lithium vanadium phosphate positive electrode material of this embodiment is composed of graphene as the coating shell and lithium vanadium phosphate as the core, and at the same time, the graphene-coated shells are connected to each other to form a three-dimensional conductive network classification A core-shell structure composite material, wherein the mass percentage of graphene in the composite material is 0.1% to 15%.

[0046] The graphene-coated lithium vanadium phosphate positive electrode material of the present embodiment has a unique hierarchical core-shell structure. Compared with the prior art, it has the following advantages: (1) the graphene used for coating is first passed through lithium hydroxide Pre-reduced, then further reduced by high-temperature calcination, the graphene coating layer in the obtained composite material has a high degree of reduction and good conductivity; (2) graphene in graphene-lithium hyd...

specific Embodiment approach 2

[0047] Embodiment 2: This embodiment is different from Embodiment 1 in that the mass percentage of graphene in the composite material is 1%-12%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0048] Embodiment 3: This embodiment is different from Embodiment 1 in that the mass percentage of graphene in the composite material is 3% to 8%. Others are the same as the first embodiment.

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Abstract

The invention provides a grapheme-coated lithium vanadium phosphate positive electrode material and a preparation method thereof, and relates to a grapheme-coated lithium vanadium phosphate positive electrode material used as a positive electrode material of a lithium-ion secondary battery and a preparation method thereof. The grapheme-coated lithium vanadium phosphate positive electrode material provided by the invention can be used for solving the technical problem that the existing lithium vanadium phosphate / graphene composite material is unreasonable in composition and component distribution and structure, complex in preparation process, not suitable for industrial production, expensive in raw materials and difficult in acquisition of the raw materials. The grapheme-coated lithium vanadium phosphate positive electrode material provided by the invention is a hierarchical core-shell structured composite material of a three-dimensional conductive network which is formed by taking graphene as a shell and lithium vanadium phosphate as a core and mutually connecting the graphene cladding shells simultaneously. The preparation method of the graphene coated lithium vanadium phosphate positive electrode material comprises the following steps: adding V2O5 and NH4H2PO4 to a graphene-lithium hydrate slurry, and pre-sintering and calcining at a high temperature after drying to obtain the graphene coated lithium vanadium phosphate positive electrode material. The positive electrode material has excellent active substance utilization rate, high-rate charge / discharge performance and cycle performance. Besides, the grapheme-coated lithium vanadium phosphate positive electrode material can be used as the positive electrode material in the lithium-ion secondary battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, and in particular relates to a graphene-coated lithium vanadium phosphate material used for lithium-ion secondary battery cathode materials and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have a high operating voltage, high energy density and power density, so they occupy a dominant position in the field of batteries for consumer electronics products. However, in order to solve energy and environmental problems, electric vehicle batteries and energy storage batteries, which are highly valued, put forward higher requirements for current lithium-ion batteries. Among them, the positive and negative electrode materials that restrict the performance and cost of lithium-ion batteries are battery updates. Basic measures for replacement. Lithium vanadium phosphate has good safety performance, fast lithium ion solid phase diffusion ability and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/62H01M4/625H01M4/628Y02E60/10
Inventor 贾铮刘道庆李超李振华
Owner HARBIN INST OF TECH
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