Method for preparing lithium ionic cell anode material lithium vanadium fluorophosphate by hydro-thermal synthesis reaction

A technology for lithium vanadium phosphate and lithium ion battery, which is applied in the field of lithium vanadium phosphate lithium fluorophosphate positive electrode material prepared by hydrothermal synthesis reaction, which can solve the problem of uneven particle size distribution of synthetic materials, poor conductivity and cycle performance, and material failure. Uneven particle size distribution and other problems, to achieve the effect of inhibiting excessive growth, easy to control, and simple and convenient methods
CN101456550AInactive Publication Date: 2009-06-17GUILIN UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GUILIN UNIVERSITY OF TECHNOLOGY
Publication Date
2009-06-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing a lithium ion battery anode material, namely vanadium lithium fluophosphate, through hydrothermal synthesis reaction, which comprises: dissolving ammonium metavanadate, phosphate, organic acid, lithium salt and villaumite into water according to the mol ratio of 1.9-2.1:1.9:2.1:0.95-1.1:1.9-2.1:1.9-2.1, making the mixture react for 1 to 4 days in a hydrothermal synthesis reaction kettle at a temperature of between 200 and 350 DEG C, and drying the mixture to obtain a finished product, namely LiVPO4F. The method is simple and convenient, is easy to control, has low cost, simplifies the synthesis technology, and improves the charge and discharge performance and the cycle performance of samples.
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Description

technical field

[0001] The invention relates to a method for preparing lithium vanadium vanadium phosphate, a cathode material of a lithium ion battery, by a hydrothermal synthesis reaction. Background technique

[0002] Lithium-ion secondary batteries have many excellent characteristics, and have been widely used in portable electronic products, communication tools, electric vehicles, and energy storage devices. The performance of lithium-ion batteries depends largely on the cathode material. Among them, lithium vanadium fluorophosphate (LiVPO) in the vanadium-based cathode material 4 F) Due to its good reversible performance, rich sources of raw materials, high specific capacity (theoretical capacity is 156mAh / g), and high platform ratio (4.2V vs Li + / Li) and other advantages have attracted great attention. But the following disadvantages hinder its practical application: (1) V in synthesis 3+ easily oxidized to V 5+ , it is not easy to obtain single-phase LiVPO 4 F...

Claims

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