Alloying Motif Confined in Intercalative Frameworks toward Rapid Li-Ion Storage.

Abstract

High‐capacity alloying‐type anodes suffer poor rate capability due to their great volume expansion, while high‐rate intercalation‐type anodes are troubled with low theoretical capacity. Herein, a novel mechanism of alloying in the intercalative frameworks is proposed to confer both high‐capacity and high‐rate performances on anodes. Taking the indium‐vanadium oxide (IVO) as a typical system, alloying‐typed In is dispersed in the stable intercalative V2O3 to form a solid solution. The alloying‐typed In element provides high lithium storage capacity, while the robust, Li‐conductive V−O frameworks effectively alleviate the volume expansion and aggregation of In. Benefiting from the above merits, the anode exhibits a high specific capacity of 1364 mA h g−1 at 1 A g−1 and an extraordinary cyclic performance of 814 mA h g−1 at 10 A g−1 after 600 cycles (124.9 mA h g−1 after 10 000 cycles at 50 A g−1). The superior electrochemical rate capability of (In,V)2O3 solid solution anode rivals that of the reported alloying anode materials. This strategy can be extended for fabricating other alloying/intercalation hybrid anodes, such as (Sn,V)O2 and (Sn,Ti)O2, which demonstrates the universality of confining alloying motifs in intercalative frameworks for rapid and high‐capacity lithium storage.