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Lithium manganese phosphate-lithium vanadium phosphate/graphene/carbon cathode material and preparation method thereof

A technology of lithium vanadium phosphate and lithium manganese phosphate, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of poor electrochemical performance, high equipment requirements, and high production costs, achieve uniform coating, and facilitate deintercalation , the effect of increasing the contact area

Active Publication Date: 2020-06-05
安徽维晶新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is too complicated, requiring two hydrothermal reactions, and the cycle is long. The hydrothermal reaction requires high equipment, high production costs, and its electrochemical performance is poor. The 5C discharge specific capacity is only 103.4mAh / g

Method used

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  • Lithium manganese phosphate-lithium vanadium phosphate/graphene/carbon cathode material and preparation method thereof
  • Lithium manganese phosphate-lithium vanadium phosphate/graphene/carbon cathode material and preparation method thereof
  • Lithium manganese phosphate-lithium vanadium phosphate/graphene/carbon cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A lithium manganese phosphate-lithium vanadium phosphate / graphene / carbon cathode material:

[0057] The particle size of the positive electrode material is 100-200nm, and the graphene / carbon is uniformly coated on the surface of the positive electrode material, and the particles of the positive electrode material are piled up to form a uniform porous structure with a pore size of 50-250nm; Instrument detection, the mass fraction of graphene / carbon is 10.60%, wherein the content of graphene is 47.17% of graphene / carbon.

[0058] Such as figure 1 As shown, the lithium manganese phosphate-lithium vanadium phosphate / graphene / carbon positive electrode material of the embodiment of the present invention is consistent with the standard cards of lithium manganese phosphate and lithium vanadium phosphate, and has good crystallinity, and no other obvious miscellaneous peaks are seen, indicating that only phosphoric acid is contained Lithium manganese and lithium vanadium phospha...

Embodiment 2

[0070] A lithium manganese phosphate-lithium vanadium phosphate / graphene / carbon cathode material:

[0071] The particle size of the positive electrode material is 100-200nm, and the graphene / carbon is uniformly coated on the surface of the positive electrode material, and the particles of the positive electrode material are piled up to form a uniform porous structure with a pore size of 50-250nm; Instrument detection, the mass fraction of graphene / carbon is 11.10%, wherein the content of graphene is 27.02% of graphene / carbon.

[0072] After testing, the lithium manganese phosphate-lithium vanadium phosphate / graphene / carbon positive electrode material in the embodiment of the present invention is consistent with the standard cards of lithium manganese phosphate and lithium vanadium phosphate, with good crystallinity and no other obvious miscellaneous peaks, indicating that it only contains phosphoric acid Lithium manganese and lithium vanadium phosphate pure phase.

[0073] Af...

Embodiment 3

[0084] A lithium manganese phosphate-lithium vanadium phosphate / graphene / carbon cathode material:

[0085] The particle size of the positive electrode material is 100-200nm, and the graphene / carbon is uniformly coated on the surface of the positive electrode material, and the particles of the positive electrode material are piled up to form a uniform porous structure with a pore size of 50-250nm; Instrument detection, the mass fraction of graphene / carbon is 7.9%, wherein the content of graphene is 12.65% of graphene / carbon.

[0086] After testing, the lithium manganese phosphate-lithium vanadium phosphate / graphene / carbon positive electrode material in the embodiment of the present invention is consistent with the standard cards of lithium manganese phosphate and lithium vanadium phosphate, with good crystallinity and no other obvious miscellaneous peaks, indicating that it only contains phosphoric acid Lithium manganese and lithium vanadium phosphate pure phase.

[0087] Afte...

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Abstract

Disclosed are a lithium manganese phosphate-lithium vanadium phosphate / graphene / carbon positive electrode material and a preparation method therefor. The surface of a positive electrode material is coated with graphene / carbon uniformly to form a uniform porous structure through mutual stacking. The preparation method comprises the steps of (1) adding a graphene oxide turbid liquid into a water solution of an organic solvent and performing ultrasonic dispersion; (2) adding oxalic acid for dissolving firstly, and then adding a vanadium source to be reacted; (3) adding a manganese source, a phosphorus source, a lithium source and an organic carbon source, and performing a reaction and freezing and drying; and (4) performing sintering and cooling. The initial discharge capacity per gram of a battery assembled from the material prepared in the invention can reach 147.1mAh / g at 2.5-4.5V and 0.2C rate; after 30 cycles at 5C, the retention rate can reach 96.7%; therefore, the positive electrode material represents high conductivity, high cycle performance and excellent rate capability; and the preparation method is simple, short in period, low in reaction temperature and suitable for industrial production.

Description

technical field [0001] The invention relates to a positive electrode material and a preparation method thereof, in particular to a lithium manganese phosphate-lithium vanadium phosphate / graphene / carbon positive electrode material and a preparation method thereof. Background technique [0002] With the gradual consumption of major natural resources such as coal and oil, the coming of the energy crisis has attracted more and more attention. In this context, green and non-polluting new high-energy chemical power sources have become a hot spot in the development of countries all over the world. [0003] Lithium-ion battery is a new type of chemical power source, which consists of two compounds that can reversibly intercalate and deintercalate lithium ions as positive and negative electrodes, respectively. When the battery is charged, lithium ions are deintercalated from the positive electrode and intercalated in the negative electrode; when the battery is discharged, lithium io...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 张佳峰韦韩信杨卓明磊张建永张宝王小玮
Owner 安徽维晶新材料科技有限公司