Flexible linear lithium ion battery and preparation method thereof

Abstract

The invention belongs to the technical field of energy storage devices and particularly relates to a high-safety flexible linear lithium ion battery and a preparation method thereof. The preparation method comprises the following steps: winding lithium manganate nano grains and an irregular multi-wall carbon nano tube mixture into an orientated multi-wall carbon nano tube thin film to obtain a positive electrode composite fiber; meanwhile, winding lithium titanate nano grains into the other same orientated multi-wall carbon nano tube thin film to form a fiber; wrapping the surface of the fiber with one thin layer of graphene oxide to obtain a negative electrode composite fiber; and finally, packaging the positive electrode composite fiber, the negative electrode composite fiber and electrolyte into a flexible tube to obtain the linear flexible lithium ion battery with high battery performance. According to the battery, an electrode material with the high safety is wound into a carbon nano tube bundle with excellent electric and mechanical properties to form a flexible fiber electrode; a metal wire is replaced so that the flexibility and the safety of a device are greatly improved; meanwhile, the fiber battery is light in mass, small in volume and large in capacity; the flexible fiber electrode is easy to braid and integrate and an important reference method is provided for application of the flexible fiber electrode in wearable equipment.

Description

technical field [0001] The invention belongs to the technical field of flexible energy storage devices, and in particular relates to a linear lithium-ion battery whose positive and negative electrodes are flexible fibers and a preparation method thereof. Background technique [0002] In recent years, various electronic devices with the characteristics of flexibility, portability and wearable have attracted extensive attention. [1-4] , Under the guidance of the huge market demand in the foreseeable future, major companies have launched various new products with advanced concepts. For example, various smart and flexible concept phones launched by Samsung, Sony, and LG; smart bracelets launched by NIKE; and Google Glasses, which were launched by Google in 2013 and attracted worldwide attention. It opened a new door to a new world where people can get the information they need just by blinking their glasses a few times. However, the development of an energy supply system compa...

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Problems solved by technology

[11] However, due to the more stringent safety requirements for wearable devices, the preparation process of linear lithium-ion batteries is more complicated, and there are no products that meet the requirements yet.

[0003] The main factor causing the safety problem of lithium-ion batteries is the formation of dendrite lithium on the positive electrode of the battery during charging, which may pierce the separator and cause a short circuit.

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