本研究成功開發一全新奈米晶粒氧化錫鍍膜製程，可於硝酸溶液中沈積一高孔隙度及高附著性之氧化錫薄膜，其沈積過程為電泳及電鍍同時參與之機構，用於鋰離子電池之陽極時有極特殊的性質，不僅活化氧化鋰使其擁有電化學活性，並抑在充放電過程中所發生金屬錫之晶粒成長行為，進而改善其鋰離子電池之性質。

　　施加電壓較-0.9 V vs. Ag/AgCl為負時，鍍膜形態為雙層結構，由一厚度較薄、於基板表面之緻密層與一較厚、位於上方之多孔隙層組成，緻密層位於多孔層及電極表面間而增加其附著性，使鍍膜擁有高比表面積及高附著性。緻密層與多孔層皆為奈米晶粒之氧化錫，分別以氧化物電鍍及電泳機構沉積於基板上。

　　若以銅作為基板，在電壓施加前，銅離子溶解至硝酸溶液中，在電壓施加後隨氧化錫沉積於基板上，銅離子則佔據氧化錫晶格中錫離子位置形成固溶體，鍍層晶粒大小為5-10 nm，當沉積時間為150，銅離子濃度約為24 at.%。做為鋰離子電池之陽極時，原為電化學鈍性之氧化鋰被奈米尺寸之氧化錫顆粒及氧化錫的銅摻雜影響，成為具電化學活性之物質，在充放電過程中引發氧化鋰的分解/合成，提供除了鋰錫合金反應外的電容量，氧化鋰在首次放電中形成，但過多的氧化鋰分解使活性顆粒在充電時剝落，因此，充放電電壓範圍對其電化學性質的影響也詳細討論，在充放電範圍為1.5 V - 0.3 V vs. Li/Li+所得之循環性最佳，經50次充放電循環後電容量仍為435 mAh/g，大於商用石墨電極之理論電容量(372 mAh/g)。

　In the study, nanocrysatlline SnO2 film has been successfully synthesized in nitrate solution by electrochemical deposition on the Pt-coated Si substrate, where electrodeposition and electrophoresis deposition take place simultaneously. The tin oxide coating posseesses a high adhesion and a high specific surface area. The specific characters not only make Li2O have electrochemical activity, but also hinder the grain growth of metallic Sn during Charge/discharge, and thus the electrochemical behavior of the nanocrystalline tin oxide coating for Li-ion batteris can be promted.

　As the applied voltage is morene gative than -0.9 V vs. Ag/AgCl, a doule-layered tin oxide coating, composed of an upper porous layer and an underlying dense layer, can be obtained. Both the dense and the porous layers are nanocrystalline but they can be attributed to the electrodeposition and electrophoresis deposition, respectively. The dense layer, locating between the porous layer and the substrate, enhances the adhesion for the coating. Thus, the SnO2 coating possesses a high specific area and a good adhesion.

　For the application in the secondary Li-ion battery, the Cu substrate is employed to avoid the electrochemical reaction between the electrolyte and substrate, and thus a Cu-doped nanocrystalline tin oxide coating can be obtained, where the Cu2+ ions occupy the Sn4+ positions. For deposition time of 150 seconds, the Cu concentration in SnO2 lattice is about 24at.% with the grain size range of 5-10 nm, and no other impurity was found. Li2O, being supposed to be an electrochemically inert materials, is activated by both the doped Cu element and the Cu-doped SnO2 nanoparticle. The decomposition/formation of Li2O can offer an extra capacity besides that from the Sn-Li alloy/dealloy reaction; however, an intense decomposition of Li2O damages the adhesion between the active particle and the substrate. An accurate cutoff voltage range, 1.5 V to 0.3 V vs. Li/Li+, not only can provide a proper amount of capacity for the reaction involving LiO2, but also can prevent the severe volume change from the Sn-Li alloy/dealloy reaction. The Cu-doped nanocrystalline SnO2 coating after vacuum heat treatment with the cutoff voltage range of 1.5 V to 0.3 V leads to an optimized performance for charge/discharge test. The capacity does not reduce after 20 cycles and keeps around 435 mAh/g, which is higher than the capaciyt of the batteries with commercial graphite electrodes (372 mAh/g).

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