Method for preparing thin-layer graphene/transition metal fluoride composite positive electrode active material by using antibiotic bacteria residue

A technology of antibiotic slag and thin-layer graphene, which is applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., can solve the problems of low conductivity and poor cycle stability of transition metal fluorides, and achieve rapid charge transmission , Improve electrical conductivity, realize the effect of energy utilization and high-value utilization
CN112234206BActive Publication Date: 2022-03-29CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2022-03-29

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Abstract

The invention belongs to the technical field of bacterial residue solid waste treatment and battery materials, and specifically relates to a method for preparing a thin-layer graphene / transition metal fluoride composite positive electrode active material by using antibiotic bacterial residue. Performing hydrothermal liquefaction with an aqueous alkali solution, followed by solid-liquid separation to obtain a bacterial residue solution; adding a transition metal M source to the bacterial residue solution, mixing the liquid phases, performing dehydration treatment, and then performing heat treatment; the heat treatment includes sequentially performing The first stage of pretreatment and the second stage of heat treatment; the product obtained by the heat treatment and the fluorine source are subjected to fluorination and annealing treatment to obtain the thin-layer graphene / M metal fluoride composite positive electrode active material. The invention also provides the material prepared by the preparation method and its application in lithium batteries. The technical scheme described in the present invention can realize the double synergy of chemical and physical structures, which helps to significantly improve the electrochemical performance of materials.
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Description

technical field

[0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and in particular relates to a method for preparing thin-sheet graphene / transition metal fluoride composite positive electrodes from antibiotic bacteria residues. Background technique

[0002] Lithium-ion batteries are widely used in portable electronic devices, new energy vehicles, energy storage power systems and other fields due to their high operating voltage, no memory effect, high energy density, and low self-discharge rate. With the development of new energy technologies such as electric vehicles, traditional lithium-ion battery cathode materials, such as lithium cobalt oxide, lithium iron phosphate, ternary materials, etc., are subject to lithium deintercalation mechanisms, and their specific capacity is difficult to meet the needs of the next generation of high energy density lithium batteries. ion battery needs. Therefore, the development of alternative ...

Claims

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