Journal of Inorganic Materials (无机材料学报) 2014/29:7 PP.747-752
The Co-S alloys were prepared by a hydrothermal method and the process parameters were optimized. The surface morphology and phase structure of Co-S alloys were characterized by SEM and XRD. The electrochemical properties of Co-S alloys were investigated by galvanostatic charge and discharge tests, cyclic voltammetry and AC impedance. The results indicated that the as-prepared Co-S alloy, which was synthesized using a 70% packing volume of the reaction solution at 160℃ for 12 h, showed good crystallinity. This alloy consisted of metallic Co and Co9S8 phases with a cross-linked lamellar morphology of about 50 nm in thickness. It possessed a maximum discharge capacity of 536 mAh/g at charge and discharge current density of 150 mA/g and a good cycling stability with capacity retention rate of 77.4% after 50 cycles. The redox reactions between Co and Co(OH)2 were the main reaction during charge and discharge. Partial dissolution of Co reduced the active material and led to capacity decay.
 TOLLEFSON J. Hdrogen vehicles: fuel of the future? Nature, 2010, 464(7293): 1262-1264.
 ZHAO X Y, MA L Q, SHEN X D. Co-based anode materials for alkaline rechargeable Ni/Co batteries: a review. Journal of Materials Chemistry, 2012, 22(2): 277-285.
 LIU Y, WANG Y J, XIAO L L, et al. Structure and electrochemical behaviors of a series of Co-B alloys. Electrochimica Acta, 2008, 53(5): 2265-2271.
 WANG Y, LEE J M, WANG X. An investigation of the origin of the electrochemical hydrogen storage capacities of the ball-milled Co-Si composites. International Journal of Hydrogen Energy, 2010, 35(4): 1669-1673.
 ZHAO D J, ZHANG S Z, YIN G P, et al. Tungsten doped Co-Se nanocomposites as an efficient non precious metal catalyst for oxygen reduction. Electrochimica Acta, 2013, 91: 179-184.
 CAO Y L, ZHOU W C, LI X Y, et al. Electrochemical hydrogen storage behaviors of ultra?ne Co-P particles prepared by direct ball-milling method. Electrochimica Acta, 2006, 51(20): 4285-4290.
 WANG J, NG S H, WANG G X, et al. Synthesis and characterization of nanosize cobalt sulfide for rechargeable lithium batteries. Journal of Power Sources, 2006, 159(1): 287-290.
 LU Z W, YAO S M, LI G R, et al. Microstructure and electtrochemical properties of the Co-BN composites. Electrochimica Acta, 2008, 53: 2369-2375.
 YAO S M, XI K, LI G R, et al. Preparation and electrochemical properties of Co-Si3N4 nanocomposites. Journal of Power Sources, 2008, 184: 657-662.
 LI J J, ZHAO X Y, MA L Q, et al. Effect of mechanical milling on structure, morphology and electrochemical performance of zinc oxide powders. Journal of Inorganic Materials, 2012, 27(6): 580-584.
 HAMPSEY J E, CASTRO C L D, MCCAUGHEY B, et al. Preparation of micrometer-to sub-micrometer-sized nanostructured silica particles using high-energy ball milling. Journal of the American Ceramic Society, 2004, 87(7): 1280-1286.
 WANG Q H, JIAO L F, DU H M, et al. Electrochemical hydrogen storage property of Co-S alloy prepared by ball-milling method. International Journal of Hydrogen Energy, 2010, 35(15): 8357-8362.
 LI W J, SHI E W, ZHONG W Z, et al. Formation of oxide dendrite crystal under hydrothermal condition. Journal of Synthetic Crystals, 1999, 28(2): 54-57.
 WANG Q H, JIAO L F, DU H M, et al. Facile synthesis and electrochemical properties of Co-S composites as negative materials for alkaline rechargeable batteries. Electrochimica Acta, 2011, 56(21): 1106-1110.
 施尔畏, 陈之战, 元如林, 等. 水热结晶学. 北京: 科学出版社, 2004: 40.
 徐如人, 庞文琴, 于吉红, 等. 分子筛与多孔材料化学. 北京: 科学出版社, 2004: 202-203.
 WANG Q H, JIAO L F, DU H M, et al. Comparison of Co-S electrodes synthesized via different methods for alkaline rechargeable batteries. Electrochimica Acta, 2011, 56(14): 4992-4995.
 LU D S, LI W S, TAN C L, et al. Investigation of Co-B-S system as anode material for secondary alkaline battery. Electrochimica Acta, 2009, 55(1): 171-177.
 YAO Y, ZHAO X Y, MA L Q, et al. Electrochemical properties of Co(OH)2 powders as an anode in an alkaline battery. Journal of Materials Science, 2010, 45: 3752-3756.
 ZHAO X Y, LI J J, YAO Y, et al. Electrochemical redox mechanism of Co-B-H anode material and its optimization by a novel electrolyte additive. RSC Advances, 2013, 3(5): 1327-1331.
 ZHAO X Y, MA L Q, YAO Y, et al. Electrochemical energy storage of Co powders in alkaline electrolyte. Electrochimica Acta, 2010, 55(1): 1169-1174.