Abstract
The potassium ion batteries (KIBs) based on conversion/alloying reaction mechanisms show high theoretical capacity. However, their applications are hampered by the poor cyclability resulting from the inherent large volume variations and the sluggish kinetics during K+ repeated insertion/extraction process. Herein, taken Sb2 Se3 as a model material, by rational design, nickel doped-carbon coated Sb2 Se3 nanorods (denoted as (Sb0.99 Ni0.01 )2 Se3 @C) are prepared through combined strategies of the conductive encapsulation and crystal structure modification. The carbon coating acts as an efficient buffer layer that maintains superior structural stability upon cycling. The introduction of Ni atoms can enhance electrical conductivity, leading to outstanding rate performance, which are confirmed by density functional theory calculation. The (Sb0.99 Ni0.01 )2 Se3 @C displays excellent reversible capacity (410mAhg-1 at 0.1Ag-1 after 100 cycles) and unprecedented rate capability (140mAhg-1 at 10Ag-1 ). Furthermore, KFeHCF//(Sb0.99 Ni0.01 )2 Se3 @C full cell exhibits a high specific capacity (408mAhg-1 at 0.1Ag-1 ), superior rate capability (260mAhg-1 at 2Ag-1 ). This work can open up a new avenue for the design of stable conversion/alloying-based anodes for high energy density KIBs.
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