Lithium ion battery electrode material and preparation method thereof

Abstract

The invention provides a lithium ion battery electrode material and a preparation method thereof, and belongs to the field of lithium ion batteries. The lithium ion battery electrode material comprises at least one first core body and at least one second core body, a metal lithium coating which is coated on the surface of at least one first core body; and a protective coating which coats the outer side of the metal lithium coating, so that the metal lithium coating is isolated from air. According to the prepared lithium ion battery electrode material provided by the embodiment of the invention, active lithium ions can be effectively supplemented in the chemical reaction of the battery, the active lithium ions consumed by SEI and the like formed in the first charging and discharging process are reduced, and the coulombic efficiency of the battery material is improved. In addition, the metal lithium coating is adopted as a raw material for supplementing lithium ions, so that the diffusion barrier of the lithium ions can be reduced, the transference number of the lithium ions can be increased, and the deintercalation or intercalation efficiency of the lithium ions can be improved, thereby improving the energy density and cycling stability of the lithium ion battery.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, and more specifically, to a lithium-ion battery electrode material and a preparation method thereof. Background technique [0002] With the development of science and technology and social progress, more and more smart mobile terminals have entered people's field of vision, such as smart wearable devices (such as bracelets, watches, smart glasses, augmented reality (augmented reality, AR) recognition technology equipment and virtual Reality technology (virtual reality, VR) equipment, etc.), portable electronic devices (such as smart phones, tablet computers, and notebook computers, etc.), drones, smart home robots, and smart electric vehicles, etc. The emergence of these new things has greatly enriched and facilitated people's lives and improved the production efficiency of the entire society. At the same time, it has also reversed higher demands on the energy storage system of mobi...

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Problems solved by technology

[0004] The embodiment of the present application provides a lithium-ion battery electrode material and its preparation method, which can solve the problems of low battery energy density and poor cycle performance caused by low pre-lithiation efficiency

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