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

Active Publication Date: 2019-01-15
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of uneven deposition, lithium dendrites piercing the diaphragm, easy short circuit and high interface impedance in the existing lithium negative electrode, and to provide a polymer-protected lithium negative electrode and a preparation method thereof. This kind of lithium negative electrode can inhibit lithium dendrites, prevent battery short circuit, reduce interface impedance, and improve the safety performance and cycle performance of lithium secondary batteries

Method used

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  • A polymer-protected lithium anode and a preparation method thereof
  • A polymer-protected lithium anode and a preparation method thereof
  • A polymer-protected lithium anode and a preparation method thereof

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specific Embodiment approach 1

[0015] Specific Embodiment 1: This embodiment describes a lithium negative electrode protected by a polymer. The lithium negative electrode includes a current collector 1, and the two opposite sides of the current collector 1 are each provided with a lithium-containing material layer 2, each The outer surfaces of each lithium-containing material layer 2 are coated with a polymer 3 . figure 2 It is a schematic diagram of the microstructure between the lithium-containing material layer 2 and the polymer 3, because the metal contained in the polymer 3 will be precipitated on the surface of the lithium-containing material layer 2 during the charging process and act as a skeleton structure to enhance the stability of the interface structure, and This microstructure will enhance the adhesion of the polymer film on the surface of the lithium-containing material layer 2 .

specific Embodiment approach 2

[0016] Embodiment 2: The polymer-protected lithium negative electrode described in Embodiment 1, the material of the current collector 1 is copper foil, copper mesh, copper foam, nickel foam, carbon fiber film or graphene film, The thickness is 1~100μm.

specific Embodiment approach 3

[0017] Embodiment 3: The polymer-protected lithium negative electrode described in Embodiment 1, the material of the lithium-containing material layer 2 is pure lithium, lithium aluminum alloy, lithium magnesium alloy, lithium boron alloy, lithium indium alloy , Lithium-carbon composite material or lithium-silicon composite material, with a thickness of 0.1-100 μm.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/137H01M4/139H01M4/1399
CPCH01M4/13H01M4/137H01M4/139H01M4/1399Y02E60/10
Inventor 赵伟李素丽唐伟超徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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