Alloying Motif Confined in Intercalative Frameworks toward Rapid Li‐Ion Storage

Abstract

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.

Keywords

• alloy
• anodes
• intercalative frameworks
• lithium‐ion batteries
• metal oxide