Fibrous lithium ion battery with double-helix structure and preparation method and device thereof

Abstract

The invention relates to a fibrous lithium ion battery with a double-helix structure and a preparation method and a preparation device of the fibrous lithium ion battery. According to the method, a spinning solution A containing a positive electrode material and a polymer I and a spinning solution B containing a negative electrode material and a polymer II are taken as raw materials, and electrostatic spinning is carried out by adopting an eccentric injection device which is provided with two channels and is connected with double spinneret orifices; the double-helix nanometer fiber is prepared; heating and twisting are carried out to obtain a composite fibrous material; the composite fibrous material is arranged in the tubular battery outer packaging layer along the length direction of thetubular battery outer packaging layer, and the fibrous lithium ion battery with the double-helix structure is prepared. The prepared fibrous lithium ion battery with the double-helix structure comprises a tubular battery outer packaging layer and a composite fibrous material (comprising a fibrous positive electrode material and a fibrous negative electrode material which are mutually wound to form the double-helix structure) in the tubular battery outer packaging layer, a core layer of the fibrous positive electrode material is a positive electrode material, and a skin layer is a polymer I; acore layer of the fibrous negative electrode material is a negative electrode material, and a skin layer is a polymer II.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a double helix structure fibrous lithium ion battery and a preparation method and device thereof. Background technique [0002] In recent years, various portable electronic devices, such as flexible displays, touch screens, smart clothes, and implantable medical devices, are increasingly emerging, and the research and development of corresponding energy supply devices has become a top priority. Lithium-ion batteries are widely used due to their high energy density, environmental friendliness and low cost. [0003] Flexible lithium-ion batteries are divided into (flat) surface / flat flexible lithium-ion batteries and fibrous lithium-ion batteries according to the difference in application scenarios and macroscopic states. There are some problems in the actual use of (flat) surface / plate-shaped flexible lithium-ion batteries, such as: (1) as the thickness of the energy ...

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Problems solved by technology

[0008] In view of the above shortcomings of the prior art, the present invention provides a double helix structure fibrous lithium ion battery and its preparation method and device; it can overcome the small effective contact area and lithium ion transmission rate of the existing fibrous lithium ion battery structure. Low cost and complex preparation process, effectively improve the electrochemical performance and flexibility of the fibrous lithium-ion battery (fix a section of fibrous lithium-ion battery of about 5cm on both ends of the motion console, keep one end of the console still, By moving the other end to change the test distance to achieve different distances and bending states, bending states include but not limited to stretching, twisting, bending)

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