Recently, researchers from the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences collaborated with researchers from the Shenzhen Graduate School of Tsinghua University to develop an all-solid-state planar lithium-ion miniature flexible capacitor with high energy density, good flexibility, and excellent high temperature stability, and highly integrated features. Related research result has been published in the journal Energy & Environmental Science in an article entitled "All-solid-state flexible planar lithium ion micro-capacitors".

In order to achieve this goal, the research team has made many achievements in the previous research: the combination of methane plasma reduction technology and lithography micromachining technology, successfully produced graphene-based high-power planar micro-supercapacitors [2]; The use of layer-by-layer self-assembled graphene oxide and polylysine, and the insertion of boric acid between the layers, high temperature treatment to obtain nitrogen-boron co-doped graphene film for high-capacitance and rate performance of micro-supercapacitors [3]; High-density, highly conductive polymer/graphene, activated graphene/graphene film material prepared by alternating stacking, applied to high specific energy micro-flexible supercapacitors [4]; graphene conductive polymer (PEDOT:PSS) film prepared by spraying method for ultra-thin, printable, ultra-capacitor with AC linear filtering function [5]; using thiophene nanosheet and graphene to prepare a stacked layer heterojunction composite film, and It is used in all solid supercapacitors and micro supercapacitors [6].

In this study, the research team pioneered the development of a new concept of all-solid-state flexible planar lithium-ion microcapacitors (LIMC). The LIMC uses high-conductivity graphene as a current collector, a high-voltage ion gel as an electrolyte, a nano-titanate as a negative electrode, a graphene as a positive electrode. It not only has high energy density, excellent cycle stability, high temperature electrochemical stability and excellent mechanical flexibility, but also a good modular integration capability, without the need for metal connectors, it can effectively regulate the output voltage and capacity of the output.

The ever-increasing growth of smart, flexible and miniaturized electronic products requires high-performance, secure, flexible, and highly integrated planar energy storage systems. Currently, this is still a huge challenge. Therefore, the all-solid-state flexible planar lithium ion microcapacitor has great application potential and application prospects in future flexible and wearable electronic products.

References

[6] Zhong‐Shuai Wu, Yijun Zheng, Shuanghao Zheng, et al. Stacked‐Layer Heterostructure Films of 2D Thiophene Nanosheets and Graphene for High‐Rate All‐Solid‐State Pseudocapacitors with Enhanced Volumetric Capacitance. Adv. Mater. 2016, doi:10.1002/adma.201602960.

Edited by Suzhou Yacoo Science Co., Ltd.