Sp²/sp³ Hybridized Carbon as an Anode with Extra Li-Ion Storage Capacity: Construction and Origin.

ABSTRACT: 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 sp²/sp³ 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 microsc

SUBMITTER: Lu Z 

PROVIDER: S-EPMC7453565 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature