[ Instrument network instrument research and development ] Recently, the research team of Tang Yongbing, a researcher at the Functional Thin Film Materials Research Center, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and Zhou Zhiming, a professor at Chongqing University of Technology, adopted an in-situ two-step activation strategy to prepare a Graded porous carbon cathode material, based on the material of the aqueous zinc ion hybrid battery shows excellent electrochemical energy storage performance. Related research results are titled In Situ Two-Step Activation Strategy Boosting Hierarchical Porous Carbon Cathode for an Aqueous Zn-Based Hybrid Energy Storage Device with High Capacity and Ultra-Long Cycling Life, published online in Small(DOI: 10.1002/smll.202003174 )on.
The limited and uneven distribution of lithium resources has prompted the gradual development of new energy storage devices based on abundant non-lithium alkaline (earth) metal ions. The high safety and low cost of aqueous electrolyte, as well as the advantages of zinc with environmental friendliness, good compatibility with aqueous solutions, and high theoretical specific capacity, have attracted attention to the development of aqueous zinc ion hybrid energy storage devices. However, the low specific capacity of activated carbon cathode materials limits the development of water-based zinc ion hybrid energy storage devices.
Considering that the ability of activated carbon materials to store ions depends on their porous structure, the researchers proposed an in-situ two-step activation strategy to design a hierarchical porous carbon material (HPAC) with reasonable micropore/mesoporous pore size distribution. This strategy effectively controls the pore structure and pore size distribution on the one hand, and on the other hand enhances the structural stability, and has an ultra-high specific surface area. The aqueous zinc ion hybrid energy storage device assembled with the zinc anode shows a high specific capacity ( 231 mAh g-1), excellent rate performance (119 mAh g-1@20 A g-1) and long cycle life (18000 cycles capacity retention rate ~ 70%). This research has reference significance for the development of environmentally friendly, low-cost and high-safety energy storage devices.
The research work was funded by Guangdong Provincial Key Special Project, National Natural Science Foundation of China, Guangdong Province, Shenzhen City, etc.
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