采用涂膜法和直接生长成膜法分别制备两种硅纳米线电极.XRD、SEM和充放电曲线表征、观察和测定材料嵌锂状态过程的结构、形貌及电化学性能.与涂膜法相比,直接生长成膜法制备的硅纳米线电极具有较高的比容量、良好的循环寿命及较好的倍率性能;直接生长成膜法制备的硅纳米线电极,其嵌锂过程硅由晶态逐渐转变为非晶态,且其纳米线直径逐渐增大,但线状结构仍保持完好,进而防止了电极粉化和脱落.
The SiNWs electrodes were fabricated by coating and direct growth methods,respectively.The structure,morphology and electrochemical performance of such materials were characterized by XRD,SEM and charge-discharge tests.The results show that the electrodes prepared by direct growth method had higher capacity,better battery life and also displayed and excellent cyclability at higher currents.During the process of lithiation,the initial crystalline Si transformed to amorphous LixSi,and the average diameter of the SiNWs increased.Despite the large volume changed,the SiNWs remained intact and did not break into smaller particles.
[1]Fauteux D,Koksbang R.Rechargeable lithium batteryanodes:alternatives to metallic lithium[J].Journal ofApplied Electrochemistry,1993,23:1-10.
[2]Li H,Huang X J,Chen L Q,et al.A high capacitynano-Si composite anode material for lithium recharge-able batteries[J].Electrochemical and Solid State Let-ters,1999,2(11):547-549.
[3]Yang J,Wachtler M,Winter M,et al.Sub-microcrystal-line Sn and Sn-SnSb powders as lithium storage materi-als for lithium-ion batteries[J].Electrochemical andSolid State Letters,1999,2(4):161-163.
[4]Wang C S,Appleby A J,Little F E.Electrochemicalstudy on nano-Sn,Li4.4Sn and AlSi0.1powders used assecondary lithium battery anodes[J].Journal of PowerSources,2001,93(1~2):174-185.
[5]Bourderau S,Brousse T,Schleich D M.Amorphous sili-con as a possible anode material for Li-ion batteries[J].Journal of Power Sources,1999,82:233-236.
[6]Xing W B,Wilson A M,Eguchi K,et al.Pyrolyzed pol-ysiloxanes for use as anode materials in lithium-ion bat-teries[J].Journal of the Electrochemical Society,1997,144(7):2410-2416.
[7]Larcher D,Mudalige C,George A E,et al.Si-containingdisordered carbons prepared by pyrolysis of pitch polysi-lane blends:effect of oxygen and sulfur[J].Solid StateIonics,1999,122(1~4):71-83.
[8]Wang G X,Sun L,Bradhurst D H,et al.Nanocrystal-line NiSi alloy as an anode material for lithium-ion bat-teries[J].Journal of Alloys and Compounds,2000,306(1~2):249-252.
[9]Wang G X,Sun L,Bradhurst D H,et al.Innovativenanosize lithium storage alloys with silica as active cen-tre[J].Journal of Power Sources,2000,88(2):278-281.
[10]Ng S B,Lee J Y,Liu Z L.Si-O network encapsulatedgraphite-silicon mixtures as negative electrodes for lith-ium-ion batteries[J].Journal of Power Sources,2001,94(1),63-67.
[11]Zhou G W,Sun H P,Yu D P,et al.Control Li dopingof Si nanowires by electrochemical insertation method[J].Applied Physics Letters,1999,75(16):2447-2449.
[12]Chan C K,Peng HL,Liu G,et al.High-performancelithium battery anodes using silicon nanowires[J].Na-ture Nanotechnology,2008,3(1):31-35.
[13]Laik B,Eude L,Pereira-Ramos,et al.Siliconnanowires as negative electrode for lithium-ion micro-batteries[J].Electrochimica Acta,2008,53(17):5528-5532.
[14]Liu Z T(刘增涛),Fu Y P(傅焰鹏),Li C(李晨),et al.Preparation and electrochemical property of bam-boo-shaped silicon nanotubes[J].Electrochemistry(in Chinese),2006,12(4):363-367.
[15]Graetz J,Ahn C C,Yazami R,et al.Highly reversiblelithium storage in nanostructured silicon[J].Electro-chemical and Solid State Letters,2003,6(9):A194-A197.
[16]Zane D,Antonini A,Pasquali M.A morphologicalstudy of SEI film on graphite electrodes[J].Journal ofPower Sources,2001,(97~98):146-150.
[17]Li J,Dahn J R.An in situ X-ray diffraction study ofthe reaction of Li with crystalline Si[J].Journal of theElectrochemical Society,2007,154(3):A156-A161.
[18]Wang W,Kumta P N.Reversible high capacity nano-composite anodes of Si/C/SWNTs for rechargeable Li-ion batteries[J].Journal of Power Sources,2007,172(2):650-658.
[19]Hatchard T D,Dahn J R.In situ XRD and electro-chemical study of the reaction of lithium with amor-phous silicon[J].Journal of the Electrochemical Soci-ety,2004,151(6):A838-A842.