Presentation Information
[23p-P05-38]Study of a Hollow SnO2@C Anode for High-performance Alkali Metal-ion Batteries
〇(D)Wang Xiong1, Qiaoling Kang2, Tingli Ma1 (1.Kyushu Inst. of Tech, 2.China Jiliang Univ.)
Keywords:
lithium ion batteries,sodium ion batteries,transition metal oxides
Alkali metal-ion batteries, including lithium-ion batteries (LIBs), sodium-ion batteries (SIBs) and so on, have shown great promise as energy storage solutions for portable electronics and electric transportation. However, the capacity of electrode materials and stability require further improvement. This has led to the exploration of efficient electrode materials due to challenges in addressing these shortcomings.
As a promising anode material for alkali-ion batteries, SnO2 boasts high theoretical capacity yet suffers from volume expansion and poor ionic conductivity over the ion storage period. Herein, we developed 3D carbon coated and hollow SnO2 nanostructures to unlock the potential of SnO2 anodes. The hollow architecture with hollow spaces serves as buffer zones, reliving the structural strain during repeated ion insertion/extraction. Meanwhile, the conformal carbon coating enhanced the structural integrity and electric conductivity. Benefiting from these merits, the optimized hollow SnO2@C delivered exceptional electrochemical performance for both Li and Na storage, including high reversible capacities of 738.4 mAh g-1 (Li) at 4 A g-1 after 4000 cycles and 363.2 mAh g-1 (Na) at 1 A g-1 after 1000 cycles. Impressive rate capabilities were also achieved for this hollow nanostructure. Moreover, finite element simulations revealed the critical role of the hollow and void spaces in relieving the mechanical stress and pulverization. Our SnO2 electrode design offered a simple yet effective solution to the long-standing challenges of SnO2, providing new insights into developing high-performance anodes for next-generation alkali-ion batteries.
As a promising anode material for alkali-ion batteries, SnO2 boasts high theoretical capacity yet suffers from volume expansion and poor ionic conductivity over the ion storage period. Herein, we developed 3D carbon coated and hollow SnO2 nanostructures to unlock the potential of SnO2 anodes. The hollow architecture with hollow spaces serves as buffer zones, reliving the structural strain during repeated ion insertion/extraction. Meanwhile, the conformal carbon coating enhanced the structural integrity and electric conductivity. Benefiting from these merits, the optimized hollow SnO2@C delivered exceptional electrochemical performance for both Li and Na storage, including high reversible capacities of 738.4 mAh g-1 (Li) at 4 A g-1 after 4000 cycles and 363.2 mAh g-1 (Na) at 1 A g-1 after 1000 cycles. Impressive rate capabilities were also achieved for this hollow nanostructure. Moreover, finite element simulations revealed the critical role of the hollow and void spaces in relieving the mechanical stress and pulverization. Our SnO2 electrode design offered a simple yet effective solution to the long-standing challenges of SnO2, providing new insights into developing high-performance anodes for next-generation alkali-ion batteries.