期刊
NANO-MICRO LETTERS
卷 13, 期 1, 页码 -出版社
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-021-00588-5
关键词
Aqueous zinc ion capacitor; Dual-ion adsorption; Charge storage mechanism; High energy and power; Flexible and knittable devices
资金
- National Natural Science Foundation of China [52072257, U1601216]
- National Key Research and Development Program of China [2019YFE0118800]
- National Natural Science Foundation of Guangdong Province [U1601216]
- Shandong Provincial Key RD Plan
- Public Welfare Special Program, China [2019GGX102038]
- Fundamental Research Funds for the Central Universities [201822008, 201941010]
Aqueous zinc ion capacitors with a unique dual-ion adsorption mechanism in the cathode side exhibit outstanding energy and power characteristics. The carbon cathode with immense surface area and electrochemically active heteroatom content shows superior capacitive charge adsorptions. The dual-ion adsorption mechanism enables the assembled cells to achieve exceptional energy and power performance at ultrahigh current density.
Aqueous zinc-based batteries (AZBs) attract tremendous attention due to the abundant and rechargeable zinc anode. Nonetheless, the requirement of high energy and power densities raises great challenge for the cathode development. Herein we construct an aqueous zinc ion capacitor possessing an unrivaled combination of high energy and power characteristics by employing a unique dual-ion adsorption mechanism in the cathode side. Through a templating/activating co-assisted carbonization procedure, a routine protein-rich biomass transforms into defect-rich carbon with immense surface area of 3657.5 m(2) g(-1) and electrochemically active heteroatom content of 8.0 at%. Comprehensive characterization and DFT calculations reveal that the obtained carbon cathode exhibits capacitive charge adsorptions toward both the cations and anions, which regularly occur at the specific sites of heteroatom moieties and lattice defects upon different depths of discharge/charge. The dual-ion adsorption mechanism endows the assembled cells with maximum capacity of 257 mAh g(-1) and retention of 72 mAh g(-1) at ultrahigh current density of 100 A g(-1) (400 C), corresponding to the outstanding energy and power of 168 Wh kg(-1) and 61,700 W kg(-1). Furthermore, practical battery configurations of solid-state pouch and cable-type cells display excellent reliability in electrochemistry as flexible and knittable power sources.
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