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Doping in carbon anodes can introduce active sites, usually leading to extra capacity in Li-ion batteries (LIBs), but the underlying reasons have not been uncovered deeply. Herein, the dodecahedral carbon framework (N-DF) with a low nitrogen content (3.06 wt %) is fabricated as the anode material for LIBs, which shows an extra value of 298 mA h g -1 during 250 cycles at 0.1 A g -1 . Various characterizations and theoretical calculations demonstrate that the essence of the extra capacity mainly stems from non-coplanar sp 2 /sp 3 hybridized orbital controlling non-Euclidean geometrical structure, which acts as new Li-ion active sites toward the excess Li + adsorption. The electrochemical kinetics and in situ transmission electron microscope further reveal that the positive and negative curvature architectures not only provide supernumerary Li + storage sites on the surface but also hold an enhanced (002) spacing for fast Li + transport. The sp 2 /sp 3 hybridized orbital design concept will help to develop advanced electrode materials.

sp2/sp3 Hybridized Carbon as an Anode with Extra Li-Ion Storage Capacity: Construction and Origin

sp²/sp³ Hybridized Carbon as an Anode with Extra Li-Ion Storage Capacity: Construction and Origin