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Coiled Conformation Hollow Carbon Nanosphere Cathode and Anode for High Energy Density and Ultrafast Chargeable Hybrid Energy Storage
journal contribution
posted on 2022-04-04, 17:13 authored by Gi Hwan Kim, Won Ho Choi, Jae Won Choi, Keon-Han Kim, Dong Gyu Park, Min Gyu Park, Min Gyu Kim, Haeseong Jang, Un-Hyuck Kim, Jeung Ku KangLithium-ion
batteries and pseudocapacitors are nowadays popular
electrochemical energy storage for many applications, but their cathodes
and anodes are still limited to accommodate rich redox ions not only
for high energy density but also sluggish ion diffusivity and poor
electron conductivity, hindering fast recharge. Here, we report a
strategy to realize high-capacity/high-rate cathode and anode as a
solution to this challenge. Multiporous conductive hollow carbon (HC)
nanospheres with microporous shells for high capacity and hollow cores/mesoporous
shells for rapid ion transfer are synthesized as cathode materials
using quinoid:benzenoid (Q:B) unit resins of coiled conformation,
leading to ∼5-fold higher capacities than benzenoid:benzenoid
resins of linear conformation. Also, Ge-embedded Q:B HC nanospheres
are derived as anode materials. The atomic configuration and energy
storage mechanism elucidate the existence of mononuclear GeOx units giving ∼7-fold higher ion diffusivity
than bulk Ge while suppressing volume changes during long ion-insertion/desertion
cycles. Moreover, hybrid energy storage with a Q:B HC cathode and
Ge–Q:B HC anode exploit the advantages of capacitor-type cathode
and battery-type anode electrodes, as exhibited by battery-compatible
high energy density (up to 285 Wh kg–1) and capacitor-compatible
ultrafast rechargeable power density (up to 22 600 W kg–1), affording recharge within a minute.
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suppressing volume changespoor electron conductivityhybrid energy storagehindering fast rechargefold higher capacities285 wh kgrapid ion transferhigh energy densitytype anode electrodesge – qb hc cathodeb hc nanospherestype cathoderate cathodelong ionion batteries∼ 5x unit resinssub ><still limitedrealize highmononuclear geomicroporous shellsmesoporous shellsmany applicationslinear conformationhollow coresembedded qdesertion cyclescoiled conformationbulk geatomic configurationanode materials> sub