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An ultralong-life SnS-based anode through phosphate-induced structural regulation for high-performance sodium ion batteries

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Science Bulletin 2022年第20期67卷 2085-2095,M0004页

作者： Ying Wang Hongguan Li Silin Chen Boyin Zhai Shuanlong Di Guangying Gao Sangwook Lee sangeun chun Shulan Wang Li Li School of Metallurgy Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Department of Chemistry College of ScienceNortheastern UniversityShenyang 110819China School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea School of Industrial Technology Advances Kyungpook National UniversityDaegu 41566Republic of Korea

As a star representative of transition metal sulfides, Sn S is viewed as a promising anode-material candidate for sodium ion batteries due to its high theoretical capacity and unique layered structure. However,the extremely poor electrical conductivity and severe volume expansion strongly hinder its practical application while achieving a high reversible capacity with long-cyclic stability still remains a grand challenge. Herein, different from the conventional enhancement method of elemental doping, we report a rational strategy to introduce PO_(4)^(3-)into the Sn S layers using phytic acid as the special phosphorus ***, the presence of PO_(4)^(3-)in the form of Sn–O–P covalent bonds can act as a conductive pillar to buffer the volume expansion of Sn S while expanding its interlay spacing to allow more Na+storage, supported by both experimental and theoretical evidences. Profiting from this effect combined with microstructural metrics by loading on high pyridine N-doped reduced graphene oxide, the as-prepared material presented an unprecedented ultra-long cyclic stability even after 10,000 cycles along with high reversible capacity and excellent full-cell performances. The findings herein open up new opportunities for elevating electrochemical performances of metal sulfides and provide inspirations for the fabrication of advanced electrode materials for broad energy use.

关键词： SnS Phytic acid Sodium ion batteries Ultra-long cyclic stability Anode

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