A polymer-protected lithium anode and a preparation method thereof

A polymer, lithium anode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrical components, etc., can solve the problems of lithium dendrite piercing the diaphragm, high interface impedance, uneven deposition, etc., to improve cycle stability , The effect of improving interface adhesion and reducing interface impedance
CN109216652AActive Publication Date: 2019-01-15ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUHAI COSMX BATTERY CO LTD
Publication Date
2019-01-15

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Abstract

The invention relates to a polymer-protected lithium anode and a preparation method thereof, belonging to the technical field of lithium ion batteries. The lithium negative electrode comprises a current collector, two opposite sides of the current collector are respectively provided with lithium-containing material layers, and the outer sides of each lithium-containing material layer are coated with a polymer. The invention has the advantages that: Polyacrylate metal salt (non-Li salt) or polymethacrylate metal salt (non-Li salt) was selected as the polymer to protect lithium anode, in which the standard electrode potential of the metal was higher than Li, which would be deposited at the interface between the lithium anode and the polymer protective layer during the charging process, so asto improve the interfacial adhesion and reduce the interfacial impedance. Moreover, the deposited metal can be used as the skeleton structure on the surface of lithium anode to improve the cycling stability of lithium anode. These polymers have excellent elasticity and lithium ion conductivity, which can further reduce the interfacial impedance.
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Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a polymer-protected lithium negative electrode and a preparation method thereof. Background technique

[0002] Lithium-ion batteries are widely used in portable electronic devices due to their high energy density, high discharge voltage, long cycle life, no memory effect, low self-discharge rate, wide operating temperature range, and environmental friendliness, and are gradually being used in electric vehicles. and energy storage. In the development of lithium-ion batteries, the application of graphite-based embedded anode materials is crucial to the commercialization of lithium-ion batteries. Lithium-ion batteries have been developed for many years since their birth, and the energy density has continued to increase, mainly relying on the development of higher-capacity positive electrode materials and the development of thinner separators and current co...

Claims

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