Chen Kunfeng, Xue Dongfeng
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
Chem Rec. 2018 Mar;18(3):282-292. doi: 10.1002/tcr.201700037. Epub 2017 Sep 11.
Redox chemistry is the cornerstone of various electrochemical energy conversion and storage systems, associated with ion diffusion process. To actualize both high energy and power density in energy storage devices, both multiple electron transfer reaction and fast ion diffusion occurred in one electrode material are prerequisite. The existence forms of redox ions can lead to different electrochemical thermodynamic and kinetic properties. Here, we introduce novel colloid system, which includes multiple varying ion forms, multi-interaction and abundant redox active sites. Unlike redox cations in solution and crystal materials, colloid system has specific reactivity-structure relationship. In the colloidal ionic electrode, the occurrence of multiple-electron redox reactions and fast ion diffusion leaded to ultrahigh specific capacitance and fast charge rate. The colloidal ionic supercapattery coupled with redox electrolyte provides a new potential technique for the comprehensive use of redox ions including cations and anions in electrode and electrolyte and a guiding design for the development of next-generation high performance energy storage devices.
氧化还原化学是各种与离子扩散过程相关的电化学能量转换和存储系统的基石。为了在储能装置中实现高能量和高功率密度，在一种电极材料中同时发生多电子转移反应和快速离子扩散是先决条件。氧化还原离子的存在形式会导致不同的电化学热力学和动力学性质。在此，我们引入了一种新型胶体系统，该系统包含多种不同的离子形式、多重相互作用和丰富的氧化还原活性位点。与溶液和晶体材料中的氧化还原阳离子不同，胶体系统具有特定的反应性-结构关系。在胶体离子电极中，多电子氧化还原反应和快速离子扩散的发生导致了超高的比电容和快速的充电速率。与氧化还原电解质耦合的胶体离子超级电池为电极和电解质中包括阳离子和阴离子在内的氧化还原离子的综合利用提供了一种新的潜在技术，并为下一代高性能储能装置的开发提供了指导性设计。
