Preparation method of carbon-coated nano-boron-lithium composite material for lithium-sulfur battery negative electrode

A composite material, lithium-sulfur battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of capacity loss, poor cycle life, lithium-sulfur battery capacity decline, etc., to reduce equipment costs and production costs, and improve electrical conductivity. security, improved safety and reliability
CN106784666BInactive Publication Date: 2019-04-02ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2019-04-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a lithium ion battery technology, and aims to provide a preparation method of a carbon-coated nanometer boron-lithium composite material for a lithium-sulfur battery cathode. The preparation method comprises the steps of adding glucose, urea and lithium metaborate into deionized water, and carrying out supersonic vibration for mixing and dissolving; spray drying a solution, and curing for 6 hours at the temperature of 106 DEG C to form a precursor; warming to 500 DEG C under the protection of a nitrogen environment, carbonizing for 2 hours at constant temperature, and heating for 2 to 10 hours at the temperature of 900 to 1300 DEG C to obtain the carbon-coated nanometer boron-lithium composite material. According to a lithium-sulfur battery formed by adopting the carbon-coated nanometer boron-lithium composite material as a cathode material provided by the invention, a battery cell can be produced in dried air, so that the safety, the reliability and the production efficiency in producing the lithium-sulfur battery are greatly improved, and the equipment cost and the production cost are reduced. The charging / discharging cycling stability of a boron-lithium electrode can be greatly improved, and the high-rate charge-discharge cycle life of a lithium-sulfur ion battery is prolonged.
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Description

technical field

[0001] The invention relates to a lithium-ion battery technology, more specifically, the invention relates to a preparation method of a carbon-coated nano-boron-lithium composite material used for a negative electrode of a lithium-sulfur battery. Background technique

[0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. In 1990, Nagoura and others in Japan developed a negative electrode using petroleum coke and LiCoO 2 Lithium-ion battery as the positive electrode: LiC 6 |LiClO 4 -PC+EC|LiCoO 2 . same year. The two major battery companie...

Claims

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