采用固相烧结合成 Sn0．4 Co0．4 Zn0．2合金,再以H2 SO4进行酸腐蚀,探索了 H2 SO4浓度对合金结构和电化学性能的影响.实验结果表明,Sn0．4 Co0．4-Zn0．2合金由CoSn、Co3 Sn2、CoSn2相和单质Zn组成,H2 SO4使合金中部分Zn腐蚀溶解,在颗粒内部形成孔隙,并且使颗粒内部失去粘结而粉化,颗粒细化变小.酸腐蚀改善了Sn0．4 Co0．4 Zn0．2合金的电化学性能,当 H2 SO4浓度为0．02 mol/L时,合金的首次放电容量为295 mAh/g,经过100次循环后的放电容量为234 mAh/g,保持了首次放电容量的79．3％,表现出良好的电化学活性.
The Sn0.4 Co0.4 Zn0.2 alloy was synthesized using solid-state sintering and then treated by etching,and the influence of H2 SO4 concentration on the structures and electrochemical properties were analyzed.Analysis results showed that Sn0.4 Co0.4 Zn0.2 alloy consists of CoSn,Co3 Sn2 ,CoSn2 phase and zinc simple substance.Part of zinc was corrosion dissolved by H2 SO4 ,which leads to the formation of many pores in the particle interior and the decreasing of size of particle of Sn0.4 Co0.4 Zn0.2 alloy.Etching improved the electrochemical properties of Sn0.4 Co0.4 Zn0.2 alloy.When the H2 SO4 concentration was 0.02 mol/L,the initial discharge capacity of Sn0.4 Co0.4 Zn0.2 alloy was 295 mAh/g, the retention after 100 cycles retains 79.3%, which showed the Sn0.4 Co0.4 Zn0.2 alloy has good electrochemical properties.
参考文献
| [1] | 沈丁,杨绍斌,张淑凯.锂离子电池锡钴和锡钴碳负极材料的研究进展[J].化工进展,2008(12):1892-1896. |
| [2] | Dahn JR;Mar RE;Abouzeid A .Combinatorial study of Sn1-xCox (0 < x < 0.6) and [Sn0.55Co0.45](1-y)C-y (0 < y < 0.5) alloy negative electrode materials for Li-ion batteries[J].Journal of the Electrochemical Society,2006(2):A361-A365. |
| [3] | C.M.Ionica-Bousquet;P.E.Lippens;L.Aldon .In situ ~(119)Sn Mossbauer Effect Study of Li-CoSn_2 Electrochemical System[J].Chemistry of Materials: A Publication of the American Chemistry Society,2006(26):6442-6447. |
| [4] | 李昌明,赵灵智,李黎明,张金铃,张仁元,李伟善,胡社军.射频磁控溅射制备Sn薄膜及其电化学性能研究[J].功能材料,2010(12):2072-2074,2079. |
| [5] | Todd ADW;Mar RE;Dahn JR .Combinatorial study of tin-transition metal alloys as negative electrodes for lithium-ion batteries[J].Journal of the Electrochemical Society,2006(10):A1998-A2005. |
| [6] | Todd ADW;Mar RE;Dahn JR .Tin-transition metal-carbon systems for lithium-ion battery negative electrodes[J].Journal of the Electrochemical Society,2007(6):A597-A604. |
| [7] | G. Wang;Z.W. Lu;X.P. Gao;X.J. Liu;J.Q. Wang .Electrochemical performance of La-Co-Sn alloys as anode materials for Li-ion batteries[J].Journal of Power Sources,2009(1):655-659. |
| [8] | Hassoun J;Mulas G;Panero S;Scrosati B .Ternary Sn-Co-CLi-ion battery electrode material prepared by high energy ball milling[J].Electrochemistry communications,2007(8):2075-2081. |
| [9] | Ling Huang;Jin-Shu Cai;Yang He;Fu-Sheng Ke;Shi-Gang Sun .Structure and electrochemical performance of nanostructured Sn-Co alloy/carbon nanotube composites as anodes for lithium ion batteries[J].Electrochemistry communications,2009(5):950-953. |
| [10] | Zheng Liang,Shaobin Yang.Synthesis and Electrochemical Properties of SnCo1-xFex/C Composite[J].材料科学技术学报（英文版）,2010(07):653-659. |
| [11] | Yang S B;Shen D;Li Qiang .Synthesis and electro-chemical properties of Sn0.35-0.5x Co0.35-0.5x Znx C0.30 com-posite[J].ACTA METALLURGICA SINICA,2010,46(01):6-12. |
| [12] | 杨绍斌,沈丁,吴晓光,米晗.Cu对Sn-Co/C复合材料结构和电化学性能的影响[J].中国有色金属学报,2012(04):1163-1168. |
| [13] | 沈丁,杨绍斌,吴晓光,米晗.B对Sn-Co合金结构及电化学性能的影响[J].高等学校化学学报,2011(10):2367-2370. |
| [14] | Vassiliev V;Lelaurain M;Hert Z J .A new proposal for the binary(Sn,Sb)phase diagram and its thermody-namic properties based on a new e.m.f.study[J].J Al-loys and Compounds,1997,247(01):223-233. |
| [15] | Yang J;Takeda Y;Imanishi N et al.Ultrafine Sn and SnSb0.14 powders for lithium storage matrices in lithium-ion batteries[J].Journal of the Electrochemical Society,1999,146(11):4009-4013. |
| [16] | Guo H;Zhao H L;Jia X D et al.A novel micro-spheri-cal CoSn2/Sn alloy composite as high capacity anode ma-terials for Li-ion rechargeable batteries[J].Electrochimi-ca Acta,2007,52:4853-4857. |
| [17] | Kim D G;Kim H;Sohn H J et al.Nanosized Sn-Cu-B alloy anode prepared by chemical reduction for secondary lithium batteries[J].Journal of Power Sources,2002,104:221-225. |
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