Unlock instant, AI-driven research and patent intelligence for your innovation.

Porous manganese vanadium lithium lithium phosphate composite cathode material and preparation method thereof

A composite positive electrode material, lithium manganese vanadium phosphate technology, applied in phosphorus compounds, chemical instruments and methods, battery electrodes, etc., can solve the problems of uneven pore size distribution of porous materials, reduce material uniformity, etc., and achieve low reaction temperature , excellent electrochemical performance, and wide source of raw materials

Active Publication Date: 2015-12-09
CENT SOUTH UNIV
View PDF8 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore size distribution of the porous material formed by this method is not uniform, which reduces the uniformity of the material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Porous manganese vanadium lithium lithium phosphate composite cathode material and preparation method thereof
  • Porous manganese vanadium lithium lithium phosphate composite cathode material and preparation method thereof
  • Porous manganese vanadium lithium lithium phosphate composite cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Weigh 2.45g (10mmol) of manganese acetate tetrahydrate, 4.68g (40mmol) of ammonium metavanadate, and 7.27g (70mmol) of lithium dihydrogen phosphate, add them to 0.1L deionized water, and then add 10.59 g of oxalic acid dihydrate g (84mmol), placed in a stirred reactor equipped with an ultrasonic device, at an ultrasonic frequency of 30kHz and a stirring speed of 250r / min, stirred and reacted for 1h to obtain a mixed solution;

[0035] (2) Place the mixed solution obtained in step (1) in a vacuum freeze dryer, and freeze-dry in vacuum for 24 hours at -30°C and a vacuum degree of 15Pa to obtain a solid powder;

[0036] (3) The solid powder obtained in step (2) was roasted at 725°C for 8 hours under the protection of high-purity argon, and then cooled to room temperature with the furnace to obtain the porous manganese vanadium lithium phosphate composite positive electrode material Li 2.33 mn 0.33 V 1.33 (PO 4 ) 2.33 .

[0037] Depend on figure 1 The transmission...

Embodiment 2

[0041] (1) Weigh 9.80g (40mmol) of manganese acetate tetrahydrate, 14.02g (120mmol) of ammonium metavanadate, 5.27g (220mmol) of lithium hydroxide, 25.3g (220mmol) of ammonium dihydrogen phosphate, and add them into 0.6L to remove Then add 30.26g (240mmol) of oxalic acid dihydrate into ionized water, place it in a stirred reactor equipped with an ultrasonic device, and stir for 0.5h at an ultrasonic frequency of 20kHz and a stirring speed of 50r / min to obtain a mixed solution;

[0042] (2) Place the mixed solution obtained in step (1) in a vacuum freeze dryer, and freeze-dry it for 12 hours at -5°C and a vacuum degree of 5 Pa to obtain a solid powder;

[0043] (3) Under the protection of high-purity hydrogen / argon mixed gas (hydrogen volume concentration is 5%), the solid powder obtained in step (2) is roasted at 500 ° C for 6 hours, and then cooled to room temperature with the furnace to obtain porous manganese vanadium lithium phosphate Composite cathode material Li 2.2 mn ...

Embodiment 3

[0047] (1) Weigh 0.35g (2mmol) of manganese oxalate dihydrate, 50.54g (432mmol) of ammonium metavanadate, 67.54g (650mmol) of lithium dihydrogen phosphate, add them to 0.66L deionized water, and then add 119.80g of oxalic acid dihydrate g (950.3mmol), placed in a stirring reactor equipped with an ultrasonic device, at an ultrasonic frequency of 40kHz and a stirring speed of 400r / min, stirred and reacted for 2h to obtain a mixed solution;

[0048] (2) Place the mixed solution obtained in step (1) in a vacuum freeze dryer, and freeze-dry in vacuum for 36 hours at -50°C and a vacuum degree of 30Pa to obtain a solid powder;

[0049] (3) The solid powder obtained in step (2) was roasted at 800°C for 10 hours under the protection of high-purity nitrogen, and then cooled to room temperature with the furnace to obtain the porous manganese vanadium lithium composite positive electrode material Li 2.98 mn 0.009 V 1.98 (PO 4 ) 2.98 .

[0050] Battery assembly: Weigh 0.4g of the obta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A porous manganese vanadium lithium lithium phosphate composite cathode material and a preparation method thereof are disclosed. The molecular formula of the porous manganese vanadium lithium lithium phosphate composite cathode material is Li3-2xMnxV2-2x(PO4)3-2x, 0<x<0.4. The preparation method comprises the following steps: (1) adding a lithium source compound, a vanadium source compound, a phosphorus source compound and a manganese source compound into deionized water, then adding oxalic acid and performing ultrasonic stirring reaction for 0.5-2 h, so as to obtain a mixed solution; (2) performing vacuum freeze drying on the mixed solution obtained in the step (1) for 12-36 h, so as to obtain a solid powder; and (3) roasting the solid powder obtained in the step (2) in a protective atmosphere at 500-800 DEG C for 6-10 h, and cooling along with the furnace to room temperature, so as to obtain the porous manganese vanadium lithium lithium phosphate composite cathode material. The method is simple in manufacturing process and low in cost, and the obtained porous manganese vanadium lithium lithium phosphate composite cathode material is excellent in electrochemical performances.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a preparation method of a porous manganese vanadium lithium phosphate composite positive electrode material. 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 is composed of two compounds that can reversibly insert and extract lithium ions as positive and negative electrodes. When the battery is charged, lithium ions are deintercalated from the positive electrode and intercalated in the negative electrode; when discharging, lithium ions are deintercalated from the negative el...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 张佳峰王小玮张宝李晖刘益童汇
Owner CENT SOUTH UNIV