China University of Science and Technology invents a new type of high-efficiency electrolysis for all-solid supercapacitors

China University of Science and Technology Invents a New High-Efficiency Electrolyte for All-Solid Supercapacitors

Amphoteric gel electrolytes form ion channels under electric fields and have good water retention properties

Recently, the team of Wu Changzheng of the Xie Yi Team of the University of Science and Technology of China, in collaboration with Liu Guangming's research group, used a new type of amphoteric gel electrolyte with a unique ion channel for all-solid supercapacitors and obtained the best current graphene-based all-solid supercapacitors. performance. The amphoteric gel electrolyte is expected to become a new highly efficient electrolyte in the field of all-solid supercapacitors. The research was published online on May 26 in Nature Communications, 7:11782 (2016). The first author of the thesis was Peng Xu, a doctoral student and Liu Huili, a master student of China University of Science and Technology.

In the face of increasing energy demand, all-solid-state supercapacitors have attracted wide attention as new types of energy storage devices, and gel electrolytes are among the key technology materials. In order to achieve the requirements of rapid charge and discharge and high stability of all-solid-state supercapacitors, the development of new gel electrolytes with high ionic conductivity, excellent mechanical strength, and water retention performance are important scientific issues in the field. Its core lies in how to build ordered ion channels in the gel electrolyte and understand its intrinsic electrochemical mechanism.

Faced with this challenge, Wu Changzheng's research group is based on the order of the amphoteric gel electrolyte PPDP (poly([3-(methacrylamido)propyl]dimethyl(3-thiopropyl)ammonium hydroxide inner salt) The amphoteric groups form unique ion channels for use in high-efficiency, all-solid-state supercapacitors.Synchrotron soft X-ray near-edge absorption spectra confirm that amphoteric gel electrolytes have ordered amphoteric groups in the presence of an applied electric field, enabling the formation of unique ion channels. It is beneficial to the transmission of salt ions in the gel electrolyte.At the same time, each amphoteric group can be combined with 8 water molecules to form a hydration layer, so that the electrolyte PPDP has good water retention properties.The graphene-based all-solid supercapacitor constructed, At a current density of 0.8 Acm-3, a specific capacity of 300.8 Fcm-3 was achieved, and after the current density was increased 25 times, only a specific capacity loss of 14.9% was achieved, which is the highest among current graphene-based all-solid supercapacitors. Excellent value.

This work constructs ordered ion channels and provides new ideas for designing new high-efficiency energy storage devices.

The above research was supported by the National Natural Science Foundation of China, the Ministry of Science and Technology, and the Collaborative Innovation Center for Energy and Materials Chemistry.

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