Tungsten carbide shell layer coated lithium iron phosphate positive electrode material and preparation method therefor

A technology of lithium iron phosphate and positive electrode materials, which is applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of lower volume specific capacity and unsatisfactory lithium iron phosphate, and achieve excellent rate performance and good binding force Effect

Inactive Publication Date: 2016-06-01
SIHUI DABOWEN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coated carbon can overcome the defect of poor electrical conductivity to a certain extent, but the effect of improving the rate performance of the material is still unsatisfactory, and the volume specific capacity of lithium iron phosphate is reduced due to the small carbon density

Method used

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  • Tungsten carbide shell layer coated lithium iron phosphate positive electrode material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 0.1 mol of ferrous sulfate, 0.11 mol of lithium chloride and 0.1 mol of ammonium dihydrogen phosphate, respectively dissolve them in 200ml of deionized water, mix them together and pour them into a hydrothermal reaction tank, add ammonia water, control the pH to 9.0, and seal Placed in a heater, 200 ℃ hydrothermal reaction for 24h. After cooling, the precipitate was repeatedly centrifuged and washed with deionized water, and the separated powder was vacuum-dried at 100°C for 10 hours to obtain lithium iron phosphate (LiFePO 4 sample). The LiFePO 4 The sample was placed in the reaction chamber of the plasma-enhanced chemical vapor deposition equipment, and the vacuum was evacuated to 1.0×10 -1 Pa, and heated to 300°C. Charge WF 6 +CH 4 (WF 6 :CH 4 =1:1 volume ratio) mixed gas, the total pressure of the reaction chamber was maintained at 50Pa. The power output of the RF plasma is 600W. The reaction time was controlled at 25min. A lithium iron phosphate pos...

Embodiment 2

[0022] Weigh 0.1 mol of ferrous sulfate, 0.11 mol of lithium chloride and 0.1 mol of ammonium dihydrogen phosphate, respectively dissolve them in 200ml of deionized water, mix them together and pour them into a hydrothermal reaction tank, add ammonia water, control the pH to 9.0, and seal Placed in a heater, 250 ℃ hydrothermal reaction for 15h. After cooling, the precipitate was repeatedly centrifuged and washed with deionized water, and the separated powder was vacuum-dried at 100°C for 18 hours to obtain lithium iron phosphate (LiFePO 4 sample). The LiFePO 4 The sample was placed in the reaction chamber of the plasma-enhanced chemical vapor deposition equipment, and the vacuum was evacuated to 1.0×10 -1 Pa, and heated to 400°C. Charge WF 6 +CH 4 (WF 6 :CH 4 =1:1.5 volume ratio) mixed gas, the total pressure of the reaction chamber is maintained at 10Pa. The power output of the RF plasma is 800W. The reaction time was controlled within 10 minutes. A lithium iron pho...

Embodiment 3

[0024] Weigh 0.1 mol of ferrous sulfate, 0.11 mol of lithium chloride and 0.1 mol of ammonium dihydrogen phosphate, respectively dissolve them in 200ml of deionized water, mix them together and pour them into a hydrothermal reaction tank, add ammonia water, control the pH to 9.0, and seal Placed in a heater, 300 ℃ hydrothermal reaction 10h. After cooling, the precipitate was repeatedly centrifuged and washed with deionized water, and the separated powder was vacuum-dried at 100°C for 17 hours to obtain lithium iron phosphate (LiFePO 4 sample). The LiFePO 4 The sample was placed in the reaction chamber of the plasma-enhanced chemical vapor deposition equipment, and the vacuum was evacuated to 1.0×10 -1 Pa, and heated to 500°C. Charge WF 6 +CH 4 (WF 6 :CH 4 =1:1.2 volume ratio) mixed gas, the total pressure of the reaction chamber is maintained at 100Pa. The power output of the RF plasma is 400W. The reaction time was controlled at 60min. A lithium iron phosphate posit...

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Abstract

The invention discloses a tungsten carbide shell layer coated lithium iron phosphate positive electrode material and a preparation method therefor. The tungsten carbide shell layer coated lithium iron phosphate positive electrode material is prepared by the steps of putting lithium iron phosphate into a reaction chamber, performing vacuum pumping, and carrying out heating to 200-500 DEG C; taking tungsten hexafluoride and methane at a volume ratio of 1:1-1.5 as the gas raw materials and injecting the gas raw material into the reaction chamber; maintaining the total gas pressure intensity in the reaction chamber at 10-100Pa, and performing reaction for 10-60min to obtain the positive electrode material, wherein the power supply output power of the radio frequency plasma is 400-800W. The tungsten carbide shell layer coated lithium iron phosphate prepared by the invention has an excellent rate capability.

Description

Technical field: [0001] The invention belongs to the technical field of preparation technology of positive electrode materials of lithium ion batteries, and in particular relates to a lithium iron phosphate positive electrode material coated with a tungsten carbide shell layer and a preparation method thereof. Background technique: [0002] In the 21st century, energy and environmental pollution have become a worldwide problem. The development and application of new energy sources is imminent. Lithium-ion batteries have the advantages of high working voltage and high specific energy, and have been used in portable electronic products such as notebook computers, mobile phones and digital cameras. In recent years, the rapid development of pure electric and hybrid electric vehicles has provided a huge market prospect and high-speed development opportunities for lithium-ion power batteries, but it also poses new challenges to its performance improvement and cost reduction. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525
CPCH01M4/366H01M4/5825H01M4/587H01M10/0525Y02E60/10
Inventor 闵德刘丽英罗统钊
Owner SIHUI DABOWEN IND CO LTD
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