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 l

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

Example Embodiment

[0031] Example 1

[0032] This embodiment includes the following steps:

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

[0034] (2) Spray drying 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, and the spray drying fan speed is 100HZ to obtain solid powder;

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

Example Embodiment

[0041] Example 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 it into 0.525L of deionized water; at an ultrasonic frequency of 20kHz, a stirring speed of 100r / min, stirring for 1.5h to obtain a mixed solution;

[0044] (2) Spray drying 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, and the spray drying fan speed is 40HZ to obtain solid powder;

[0045] (3) The solid powder obtained in step (2) is roasted at 500°C for 6 hours under the protection of high-purity hydrogen / argon mixed gas (hydrogen volume concentration is 5%), and then cooled to room temperature with the furnace to obtain a nested V 2 O 3 Coated Li 3 V...

Example Embodiment

[0048] Example 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, 18.99g (0.15mol) of oxalic acid dihydrate, and add them together. 0.3L deionized water; at an ultrasonic frequency of 40kHz and a stirring speed of 400r / min, the reaction is stirred for 2h to obtain a mixed solution;

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

[0052] (3) The solid powder obtained in step (2) is roasted at 500°C for 6 hours under the protection of high-purity argon, and then cooled to room temperature in the furnace to obtain a 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 is 7.35%.

[0...

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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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