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Lithium zirconate-lithium vanadium phosphate composite electrode material and preparation method and application thereof

A lithium vanadium phosphate and composite electrode technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of unsuitable large-scale production, low lithium ion diffusion, affecting rate performance, etc., to achieve easy control and improve specific capacity. , the effect of improving quality and stability

Active Publication Date: 2018-09-14
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, Li 3 V 2 (PO 4 ) 3 As an electrode material alone, it has the disadvantages of low electronic conductivity and lithium ion diffusion system, which is prone to polarization, especially affects the rate performance, which greatly limits the application in high-power batteries, and Li 3 V 2 (PO 4 ) 3 The preparation process requires high temperature, reducing atmosphere and other conditions, the preparation is difficult, and it is not suitable for large-scale production

Method used

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  • Lithium zirconate-lithium vanadium phosphate composite electrode material and preparation method and application thereof
  • Lithium zirconate-lithium vanadium phosphate composite electrode material and preparation method and application thereof
  • Lithium zirconate-lithium vanadium phosphate composite electrode material and preparation method and application thereof

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Embodiment 1

[0038] This embodiment provides a lithium zirconate-lithium vanadium phosphate composite electrode material, which includes lithium vanadium phosphate, carbon simple substance and lithium zirconate coated on the surface of the lithium vanadium phosphate in sequence.

[0039] This embodiment also provides a preparation method of the lithium zirconate-lithium vanadium phosphate composite electrode material, which includes the following steps:

[0040] Lithium vanadium phosphate precursor is prepared according to the molar ratio of lithium element, vanadium element, carbon element, phosphorus element is 3.1:2:12:3, lithium hydroxide, vanadium pentoxide, tartaric acid and phosphoric acid are ground together and mixed evenly , to obtain a mixed raw material; dropwise deionized water was added to the mixed raw material and mixed evenly to obtain a solid-liquid rheological body; the solid-liquid rheological body was kept at 70-90° C. for 5 hours, taken out, ℃ drying for 10 hours to o...

Embodiment 2

[0046] This embodiment provides a lithium zirconate-lithium vanadium phosphate composite electrode material, which includes lithium vanadium phosphate, carbon simple substance and lithium zirconate coated on the surface of the lithium vanadium phosphate in sequence.

[0047] This embodiment also provides a preparation method of the lithium zirconate-lithium vanadium phosphate composite electrode material, which includes the following steps:

[0048] The lithium vanadium phosphate precursor is prepared according to the molar ratio of lithium element, vanadium element, carbon element, and phosphorus element at a ratio of 3.1:2:12:3, and lithium carbonate, ammonium metavanadate, citric acid, and ammonium dihydrogen phosphate are co-ground , and mix uniformly to obtain a mixed raw material; add deionized water dropwise to the mixed raw material and mix evenly to obtain a solid-liquid rheological body; keep the solid-liquid rheological body at 70-90°C for 8 hours, take it out, and ...

Embodiment 3

[0054] This embodiment provides a lithium zirconate-lithium vanadium phosphate composite electrode material, which includes lithium vanadium phosphate, carbon simple substance and lithium zirconate coated on the surface of the lithium vanadium phosphate in sequence.

[0055] This embodiment also provides a preparation method of the lithium zirconate-lithium vanadium phosphate composite electrode material, which includes the following steps:

[0056] Lithium vanadium phosphate precursor is prepared according to the molar ratio of lithium element, vanadium element, carbon element, phosphorus element is 3.1:2:12:3, lithium carbonate, vanadium pentoxide, salicylic acid and phosphoric acid are ground together, mixed homogeneously, to obtain the mixed raw material; dropwise add deionized water to the mixed raw material and mix evenly to obtain the solid-liquid rheological variant; keep the solid-liquid rheological variant at 70-90°C for 6 hours, take it out, and heat it at 90-90°C D...

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Abstract

The invention provides lithium zirconate-lithium vanadium phosphate composite electrode material, comprising lithium vanadium phosphate, and elemental carbon and lithium zirconate which sequentially coat the surface of the lithium vanadium phosphate; coating of the elemental carbon and lithium zirconate helps effectively increase the specific capacity of the material and improve its cycle performance. In addition, the invention also provides a preparation method and application of the lithium zirconate-lithium vanadium phosphate composite electrode material; the preparation method is simple and easily operable, is suitable for the preparation of electrode materials evenly coated with elemental carbon and lithium carbonate, and has a promising application prospect.

Description

technical field [0001] The invention relates to an electrode material, in particular to a lithium zirconate-lithium vanadium phosphate composite electrode material and a preparation method and application thereof. Background technique [0002] Under the international and contemporary background of active development and utilization of new energy sources, lithium-ion batteries, as an ideal energy storage device, have attracted more and more attention. Especially in recent years, lithium-ion batteries have begun to be used in electric vehicles and power grids with high energy density and high power density, making the development prospects of lithium-ion batteries more prominent. Lithium vanadium monoclinic phosphate (Li 3 V 2 (PO 4 ) 3 ) due to the advantages of stable structure, high working voltage, high reversible capacity, and good electrochemical and thermodynamic stability, it has become one of the positive electrode materials for lithium batteries with good prospec...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 曹晓雨朱利敏莫璐璐谢玲玲
Owner HENAN UNIVERSITY OF TECHNOLOGY
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