Dynamic self-adapting strategy for durable potassium ion batteries

Abstract

Structures with dynamic stress buffering effects have shown great potential for developing durable electrode materials. In this work, a dynamic self-adapting strategy is proposed to in situ construct durable (Bi, Sb)/dipotassium terephthalate (K2TP) from Bi0.17Sb0.83-MOF for the anode of potassium ion batteries (PIBs). K2TP, with a flexible structure, tightly incorporates particles of Bi0.17Sb0.83 to form a new composite and buffers the stress caused by the repeated intercalation/de-intercalation of K ions. Benefiting from the novel structural and compositional superiorities, the Bi0.17Sb0.83-MOF@MXene exhibits an ultralong cyclability with negligible capacity decay at 200 mA g−1 after 900 cycles. This study not only illustrates the effectiveness of a dynamic self-adapting strategy but also provides a guiding insight for developing durable rechargeable batteries.