采用高能球磨方法制备了用作锂离子电池负极材料的Si-Cu/C复合材料.X射线衍射和扫描电子显微镜结果表明,复合材料中Si和Cu5Si是共存的,活性硅颗粒均匀地分散在石墨和惰性的铜硅合金基体中.电化学测试在电流密度0.2mA·cm-2,电压范围0～1.4 V条件下进行,其结果表明高分散Si-Cu/C复合材料首次可逆容量为524 mAh·g-1,远高于目前普遍使用的中间相碳微球;循环寿命也远优于同粒度的硅单体,经过30次循环后容量仍保持531 mAh·g-1.其高比容量和良好的循环性能表明:高分散Si-Cu/C复合材料有望替代碳成为锂离子电池负极材料.
参考文献
| [1] | Obrovac M N;Christensen L .Structural changes in silicon anodes during lithium insertion/extraction[J].Electrochemical and Solid-State Letters,2004,7:A93. |
| [2] | Hatchard TD;Dahn JR .Study of the electrochemical performance of sputtered Si1-xSnx films[J].Journal of the Electrochemical Society,2004(10):A1628-A1635. |
| [3] | Idota Y;Kubota T;Matsufuji A et al.Tin-based amorphous oxide:a high-capacity lithium-ion-storage material[J].Science,1997,276:1395. |
| [4] | Winter M;Besenhard J O .Electrochemical lithiation of tin and tin-based intermetallics and composites[J].Electrochimica Acta,1999,45:31. |
| [5] | Yang J;Takeda Y;Imanishi N et al.Ultrafine Sn and SnSb0.14powders for lithium storage matrices in lithium-ion batteries[J].Journal of the Electrochemical Society,1999,146:4009. |
| [6] | Dimov N;Kugino S;Yoshio M .Carbon-coated silicon as anode material for lithium ion batteries:advantages and limitations[J].Electrochimica Acta,2003,48:1579. |
| [7] | Yang J.;Takeda Y.;Imanishi N.;Capiglia C.;Xie JY.;Yamamoto O. .SiOx-based anodes for secondary lithium batteries[J].Solid state ionics,2002(Pt.A):125-129. |
| [8] | Kim BC;Uono H;Sato T;Fuse T;Ishihara T;Senna M .Li-ion battery anode properties of Si-carbon nanocomposites fabricated by high energy multiring-type mill[J].Solid state ionics,2004(1/4):33-37. |
| [9] | Patel P;Kim IS;Kumta PN .Nanocomposites of silicon/titanium carbide synthesized using high-energy mechanical milling for use as anodes in lithium-ion batteries[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2005(3):347-352. |
| [10] | Liu Y;Hanai K;Yang J et al.Silicon/carbon composites as anode materials for Li-ion batteries[J].Electrochemical and Solid-State Letters,2004,7:A369. |
| [11] | Kim JH;Kim H;Sohn HJ .Addition of Cu for carbon coated Si-based composites as anode materials for lithium-ion batteries[J].Electrochemistry communications,2005(5):557-561. |
| [12] | Zhang Y;Fu Z W;Qin Q Z .Microstructure and Li alloy formation of nano-structured amorphous Si and Si/TiN composite thin film electrodes[J].Electochem Commun,2004,6:484. |
| [13] | Kim I S;Blomgren G E;Kumta P N .Si-SiC nanocomposite anodes synthesized using high-energy mechanical milling[J].Journal of Power Sources,2004,130:275. |
| [14] | Kim I S;Blomgren G E;Kumta P N .Study of electrochemical inactivity of nanocomposites generated using high-energy mechanical milling[J].Journal of the Electrochemical Society,2005,152:A248. |
| [15] | Wang G X;Sun L;Bradhurst D H et al.Innovative nanosize lithium storage alloys with silica as active centre[J].Journal of Power Sources,2000,88:278. |
| [16] | Netz A;Huggins R A;Weppner W .The formation and properties of amorphous silicon as negative electrode reactant in lithium systems[J].Journal of Power Sources,2003,119-121:95. |
| [17] | Wang G.X.;Sun L. .Nanocrystalline NiSi alloy as an anode material for lithium-ion batteries[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2000(1/2):249-252. |
| [18] | Weydanz W J;Wohlfahrt-Mehrens M;Huggins R A .A room temperature study of the binary lithium-silicon and the ternary lithium-chromium-silicon system for use in rechargeable lithium batteries[J].Journal of Power Sources,1999,81-82:237. |
| [19] | Wolfenstine J .CaSi2 as an anode for lithium-ion batteries[J].Journal of Power Sources,2003,4:241. |
| [20] | Roberts G A;Cairns E J;Reimer J A .Magnesium silicide as a negative electrode material for lithium-ion batteries[J].Journal of Power Sources,2002,110:424. |
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