A core-shell structure silicon/carbon fiber flexible composite electrode material and its preparation method and application

Abstract

The invention relates to a core-shell structure silicon / carbon fiber flexible composite electrode material and a preparation method and application thereof, belonging to the technical field of flexible electrode materials. In order to solve the problem that the volume change of the existing silicon electrode causes the electrode structure to break and the electrochemical performance and flexibility of the flexible electrode to decrease after the binder is added, the present invention provides a core-shell structure silicon / carbon fiber flexible composite electrode material, which consists of core-shell Structural silicon / carbon fiber is made by electrospinning. The core nano-silicon particles of the core-shell structure silicon / carbon fiber are evenly encapsulated in the carbon fiber shell. The core part can effectively adapt to the volume expansion of silicon, and the carbon shell can prevent the electrolyte from penetrating into the core. , which improves the cycle performance and service life of the electrode; it has good flexibility and mechanical stability without adding binders, conductive agents and electrode pastes, and can withstand a large degree of bending. It is applied to lithium In the field of ion battery technology, the electrochemical performance and flexibility of lithium ion batteries can be further improved.

Description

technical field [0001] The invention belongs to the technical field of flexible electrode materials, and in particular relates to a core-shell structure silicon / carbon fiber flexible composite electrode material and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in the fields of electronic devices and hybrid vehicles due to their high energy density, long cycle life, no memory effect and environmental friendliness. With the development of bendable electronic devices and stretchable integrated circuits, the requirements for lithium-ion batteries are also getting higher and higher. These flexible electronic devices require Li-ion batteries to be lighter, thinner, more flexible, and miniaturized, so the research and development of flexible electrode materials for Li-ion batteries is on the rise. [0003] In order to enable lithium-ion batteries to be used in a wider range of fields, it is necessary to increase the en...

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Problems solved by technology

[0005] In order to solve the problem that the volume change of the existing silicon electrode causes the electrode structure to break and the electrochemical performance and flexibility of the flexible electrode to decrease after adding a binder, the present invention provides a core-shell structure silicon / carbon fiber flexible composite electrode material and its preparation method and application

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