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Realizing Improved Sodium-Ion Storage by Introducing Carbonyl Groups and Closed Micropores into a Biomass-Derived Hard Carbon Anode

pmid: 34585568
Realizing Improved Sodium-Ion Storage by Introducing Carbonyl Groups and Closed Micropores into a Biomass-Derived Hard Carbon Anode
Micropores and defects, like oxygen-containing groups, as active sites for sodium-ion storage in hard carbon have attracted considerable attention; nevertheless, most oxygen doping or oxidizing processes inevitably introduce undesired oxygen groups into a carbon framework, leading to deteriorated initial Coulombic efficiency (ICE). Here, precise carbonyl groups and closed micropores are together introduced into biomass-derived hard carbon to enhance the Na-ion storage performance. The hard carbon delivers a large reversible capacity of 354.6 mA h g-1 at 30 mA g-1, a high ICE (88.7%), as well as ultra-long cycling stability (277 mA h g-1 at 0.3 A g-1 over 1000 cycles; 243 mA h g-1 at 1 A g-1 over 5000 cycles). The rate capability and cycling stability of hard carbon in carbonate- and diglyme-based electrolytes are contrasted to demonstrate the superiority of diglyme. Cyclic voltammetry at varied scans and galvanostatic intermittent titration techniques are carried out to clarify the disparity between the two different electrolyte systems. Furthermore, the as-prepared hard carbon is utilized as the anode for sodium-ion full cells exhibiting an energy density of 166.2 W h kg-1 at 0.2 C and a long-cycle life (47.9% retention over 200 cycles at 1 C).
- Nanjing University of Aeronautics and Astronautics China (People's Republic of)
- Fudan University China (People's Republic of)
- Nanjing University of Aeronautics and Astronautics China (People's Republic of)
- Commonwealth Scientific and Industrial Research Organisation Australia
- Fudan University China (People's Republic of)
cycle life, carbon framework, Chemical Sciences not elsewhere classified, hard carbon delivers, varied scans, 5000 cycles ), introducing carbonyl groups, based electrolytes, 333, ice ), Environmental Sciences not elsewhere classified, active sites, precise carbonyl groups, 1000 cycles, closed micropores, prepared hard carbon, 7 %), long cycling stability, oxygen doping, ion storage, 1 c ), like oxygen, Computational Biology, 2 c, realizing improved sodium, 200 cycles, rate capability, attracted considerable attention, cyclic voltammetry, containing groups, high ice, large reversible capacity, Medicine, together introduced, cycling stability, derived hard carbon, ion storage performance, hard carbon, energy density, Developmental Biology, Biological Sciences not elsewhere classified
cycle life, carbon framework, Chemical Sciences not elsewhere classified, hard carbon delivers, varied scans, 5000 cycles ), introducing carbonyl groups, based electrolytes, 333, ice ), Environmental Sciences not elsewhere classified, active sites, precise carbonyl groups, 1000 cycles, closed micropores, prepared hard carbon, 7 %), long cycling stability, oxygen doping, ion storage, 1 c ), like oxygen, Computational Biology, 2 c, realizing improved sodium, 200 cycles, rate capability, attracted considerable attention, cyclic voltammetry, containing groups, high ice, large reversible capacity, Medicine, together introduced, cycling stability, derived hard carbon, ion storage performance, hard carbon, energy density, Developmental Biology, Biological Sciences not elsewhere classified
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