高端耐用全固态锂电池Sn-Ni合金负极薄膜材料制备及其电化学性能研究
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摘要
金属锡能与锂形成Li_2Sn_5、Li Sn、Li_(22)Sn_5等多种合金,理论质量比容量可达到997 mAh·g~(-1),是碳负极材料的两倍,具有良好的产业化前景,已成为全固态锂电池负极材料研发的重要方向。但是Sn负极材料在充放电过程中容易发生体积膨胀,颗粒粉化,使其与与集流体间接触性能降低,导致其循环性能较差。本文采用XRD、SEM等表征手段对薄膜材料的结构、形貌进行了分析,并对Sn-Ni合金负极薄膜材料电化学性能进行了测试分析,研究了不同溅射功率对Sn-Ni合金负极材料形貌和电化学性能的影响。
Tin metal can form Li_2Sn_5,LiSn,Li_(22)Sn_5 and other alloys with lithium.Its theoretical mass specific capacity can reach 997 mAh·g~(-1),which is twice as large as that of carbon anode material.It has good industrialization prospects and has become an important direction of research and development of new negative materials for lithium ion batteries.However,Sn anode materials are prone to volume expansion and particle powdering during charging and discharging,which reduces its contact performance with the collector and leads to poor cycling performance.In this paper,the structure and morphology of thin film materials were analyzed by means of XRD and SEM,and the electrochemical properties of the negative film materials of Sn-Ni alloy were tested and analyzed.The effects of sputtering power on the morphology and electrochemical properties of the negative electrode materials of Sn-Ni alloy were studied.
Tin metal can form Li_2Sn_5,LiSn,Li_(22)Sn_5 and other alloys with lithium.Its theoretical mass specific capacity can reach 997 mAh·g~(-1),which is twice as large as that of carbon anode material.It has good industrialization prospects and has become an important direction of research and development of new negative materials for lithium ion batteries.However,Sn anode materials are prone to volume expansion and particle powdering during charging and discharging,which reduces its contact performance with the collector and leads to poor cycling performance.In this paper,the structure and morphology of thin film materials were analyzed by means of XRD and SEM,and the electrochemical properties of the negative film materials of Sn-Ni alloy were tested and analyzed.The effects of sputtering power on the morphology and electrochemical properties of the negative electrode materials of Sn-Ni alloy were studied.
引文
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[2]赵海鹏,姜长印,何向明,等.电沉积法制备锂离子电池用复合锡基合金负极[J].金属学报,2007(07):775-779.
[3]Mao O,Dahn J R.Mechanically Alloyed Sn-Fe(-C)Powders as Anode Materials for Li-Ion Batteries:III.Sn2Fe:SnFe3CActive/Inactive Composites.Journal of the Electrochemical Society,1999,146(2):423-427.
[4]Winter M,Besenhard J O.Electrochemical lithiation of tin and tin-based intermetallics and composites.Electrochimica Acta,1999,45(1):31-50.
[5]任建国,王科,何向明,等.锂离子电池合金负极材料的研究进展[J].化学进展,2005(04):597-603.
[6]Tirado J L.Inorganic materials for the negative electrode of lithium-ion batteries:state-of-the-art and future prospects.Materials Science and Engineering:R:Reports,2003,40(3):103-136.
[7]李鹏.锂离子电池锡基合金薄膜负极的电化学制备及其性能研究[D].湘潭大学,2014.
[8]万艳玲.高容量Sn-Cu、Sn-Ni锂离子电池负极材料的制备与性能研究[D].湘潭大学,2014.
[9]Lee H Y,Jang S W,Lee S M,et al.Lithium storage properties of nanocrystalline Ni3Sn4 alloys prepared by mechanical alloying.Journal of Power Sources,2002,112(1):8-12.
[10]Hassoun J,Panero S,Simon P,et al.Long-Life Ni-Sn Nanostructured Electrodes for Lithium-Ion Batteries.Advanced Materials,2007,19(12):1632-1635.