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
CN105633362AInactive Publication Date: 2016-06-01SIHUI DABOWEN IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SIHUI DABOWEN IND CO LTD
Publication Date
2016-06-01
Estimated Expiration
Not applicable · inactive patent

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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.
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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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