Effect and function mechanism of amorphous sulfur on the electrochemical properties of cobalt hydroxide electrode

✍ Scribed by Dawei Song; Yijing Wang; Qinghong Wang; Yaping Wang; Lifang Jiao; Huatang Yuan

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 938 KB
• Volume: 195
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2010.04.088

✦ Synopsis

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 S in 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 S in 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.