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Nested V2O3-cladding lithium vanadium phosphate lithium ion anode material

A technology for coating lithium vanadium phosphate and positive electrode materials, which is applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of high sintering temperature and complicated coating process, achieve uniform coating, improve cycle performance, temperature low effect

Active Publication Date: 2015-12-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vanadium trioxide is a kind of good electrical conductivity ( ) metal oxides, but has not been used to coat lithium vanadium phosphate materials
However, the coating process is complex and the sintering temperature is high

Method used

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  • Nested V2O3-cladding lithium vanadium phosphate lithium ion anode material
  • Nested V2O3-cladding lithium vanadium phosphate lithium ion anode material
  • Nested V2O3-cladding lithium vanadium phosphate lithium ion anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment includes the following steps:

[0033] (1) Weigh 12.87g (0.11mol) of ammonium metavanadate, 15.59g (0.15mol) of lithium dihydrogen phosphate, as a source of phosphorus and lithium), 14.50g (0.12mol) of oxalic acid dihydrate, and mix them into 0.37 In L deionized water, the concentration of vanadium ions in the solution is 0.3mol / L; at an ultrasonic frequency of 30kHz and a stirring speed of 250r / min, stir and react for 1h to obtain a mixed solution;

[0034] (2) Spray-dry the mixed solution obtained in step (1), the spray-drying air inlet temperature is 230°C, the spray-drying peristaltic pump speed is 1000rpm / min, the spray-drying fan speed is 100HZ, and a solid powder is obtained;

[0035] (3) Under the protection of high-purity argon, the solid powder obtained in step (2) is roasted at 450°C for 5 hours, and then cooled to room temperature with the furnace to obtain the nested V 2 o3 Coated Li 3 V 2 (PO 4 ) 3 lithium-ion cathode material. where ...

Embodiment 2

[0042] This embodiment includes the following steps:

[0043] (1) Weigh 6.43g (0.055mol) of ammonium metavanadate, 4.55g (0.0275mol) of vanadium pentoxide, 3.59g (0.15mol) of lithium hydroxide, 17.25g (0.15mol) of ammonium dihydrogen phosphate, 1.38 formic acid g (0.03mol), 10.08g (0.08mol) of oxalic acid dihydrate; mix them into 0.525L deionized water; stir and react for 1.5h at an ultrasonic frequency of 20kHz and a stirring speed of 100r / min to obtain a mixed solution;

[0044] (2) Spray-dry the mixed solution obtained in step (1), the spray-drying air inlet temperature is 200°C, the spray-drying peristaltic pump speed is 500rpm / min, the spray-drying fan speed is 40HZ, and a solid powder is obtained;

[0045] (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 nested V 2 o 3 Coated Li 3...

Embodiment 3

[0049] This embodiment includes the following steps:

[0050] (1) Weigh 10.91g (0.06mol) of vanadium pentoxide, 5.54g (0.075mol) of lithium carbonate, 17.25g (0.15mol) of ammonium dihydrogen phosphate, and 18.99g (0.15mol) of oxalic acid dihydrate, and mix them into 0.3L deionized water; at an ultrasonic frequency of 40kHz and a stirring speed of 400r / min, stir and react for 2h to obtain a mixed solution;

[0051] (2) Spray-dry the solution obtained in step (1), the temperature of the spray-drying air inlet is 260°C, the speed of the spray-drying peristaltic pump is 1800rpm / min, and the speed of the spray-drying fan is 150HZ to obtain a solid powder;

[0052] (3) Under the protection of high-purity argon, 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 nested V 2 o 3 Coated Li 3 V 2 (PO 4 ) 3 lithium-ion cathode material. where V 2 o 3 relative Li 3 V 2 (PO 4 ) 3 The mass ratio...

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Abstract

The invention relates to a nested V2O3-cladding lithium vanadium phosphate lithium ion anode material and a preparation method thereof. The preparation method comprises the following steps: (1) placing a lithium source compound, a vanadium source compound, a phosphorus source compound and a reducing agent into deionized water, ultrasonically stirring to facilitate the reaction for 0.5 to 2 hours, to obtain a mixed solution, wherein the molar ratio of lithium element, vanadium element, phosphorus element and reducing agent is 1.5 to (1.05 to 1.2) to 1.5 to (1.1 to 1.5); (2) atomizing and drying the solution to obtain solid powder; (3) roasting the solid powder in a protection atmosphere under the temperature of 400 to 500 DEG C for 4 to 6 hours, and then cooling along with a furnace to the room temperature, to obtain the nested V2O3-cladding Li3V2(PO4)3 lithium ion anode material. The operation process is simple, the cladding effect is good, and the obtained composite material is excellent in rate capability.

Description

technical field [0001] The invention relates to a positive electrode material containing lithium vanadium phosphate and a manufacturing method thereof, in particular to a lithium vanadium phosphate material used as a positive electrode material of a lithium ion battery and a manufacturing method thereof, belonging to the field of lithium ion batteries. Background technique [0002] An energy crisis and environmental pollution are causing more and more problems around the world. 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. 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 ar...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M4/362H01M4/5825H01M10/0525H01M2004/028H01M2220/30Y02E60/10
Inventor 张宝王小玮明磊刘益田业成张佳峰童汇
Owner CENT SOUTH UNIV
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