Cao, Kangzhe, Wang, Shaodan, Jia, Yongheng, Xu, Dongli, Liu, Huiqiao, Huang, Ke-Jing, Jing, Qiang-Shan, and Jiao, Lifang
High-capacity N, S-C/SnS 2 nanosheets KIBs anode material was prepared by an in-situ method with only one step. • N, S-C/SnS 2 nanosheets are prepared by an in-situ carbonization and sulfuration method. • N, S-doped carbon plays bi-functional role of stabilizing electrode structure and anchoring polysulfide intermediates. • The obtained N, S-C/SnS 2 nanosheet anode delivers high reversible capacity and superior cyclic stability. As indispensable components of potassium ion batteries (KIBs), anode materials are on the focus and their developments are important for boosting the application of KIBs. Tin sulfide (SnS 2) is considered as an ideal KIBs anode material owing to its high theoretical capacity (733 mAh g−1) and the unique layered structure. However, the huge volume deformation and potassium polysulfide intermediates dissolution hinder the enhancement of the electrochemical performance of SnS 2 anode. Herein, SnS 2 nanosheets supported by N, S-doped carbon (N, S-C/SnS 2 nanosheets) were synthesized by an in-situ carbonization and sulfuration method with one step. In the formed architecture, the N, S-doped carbon not only works as matrix to stabilize the microstructure of the hybrid material, but also serves as the reservoir to trap polysulfides for alleviating the loss of sulfur element in SnS 2. Thanks to these merits, a high reversible capacity (614.8 mAh g−1 at 0.1 A g−1), as well as good rate capability (104.5 mAh g−1 at 2.0 A g−1) are achieved by the N, S-C/SnS 2 nanosheets electrode. This work offers a concise method to construct SnS 2 hybrid material, and demonstrates that K+ ion storage property of conversion-alloy reaction mechanism sulfide anodes can be remarkably enhanced by elegant structure design. [ABSTRACT FROM AUTHOR]