Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 20, Pages 7115-7119Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.04.088
Keywords
Negative electrode; Cobalt hydroxide; Amorphous sulfur; Function mechanism; Faradaic redox; Alkaline rechargeable battery
Funding
- MOST [2007AA05Z149, 2007AA05Z108, 2010CB631303]
- NSFC [50631020, 50701025, 50971071]
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S-Co(OH)(2) composite is prepared via a facile co-precipitation method and investigated as negative electrode of Ni/Co battery. The addition of amorphous S improves the electrochemical properties of Co(OH)(2) electrode. The discharge capacity of S-Co(OH)(2) electrode can reach 413.2 mAh g(-1) and still keep about 340 mAh g(-1) after 300 cycles, which is much higher than that of S-free Co(OH)(2) electrode. Amorphous Sin S-Co(OH)(2) electrode shows two functions during the charge-discharge process. One is that the addition of amorphous S with high specific surface area improves the dispersion of Co(OH)(2) platelets. The other is that the dissolution of amorphous Sin electrode brings the new interspaces among the Co(OH)(2) platelets, these two factors largely increase the interspaces among Co(OH)(2) platelets. More interspaces are correlated to larger contact area with alkaline solution, which is in favor of the surface electrochemical redox. Thus, the capacity utilization of Co(OH)(2) is enhanced. (C) 2010 Elsevier B.V. All rights reserved.
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