Degradation mechanism of room temperature Na/Ni3S2 cells using Ni3S2 electrodes prepared by mechanical alloying

Title
Degradation mechanism of room temperature Na/Ni3S2 cells using Ni3S2 electrodes prepared by mechanical alloying
Authors
Ho-Suk RyuJong-Seon KimJinsoo ParkJin-Young ParkGyu-Bong ChoXiaojing LiuIn-Shup AhnKi-Won KimJou-Hyeon Ahn안재평Steve W. MartinGuoxiu WangHyo-Jun Ahn
Keywords
Battery; Degredation mechanism; Sodium battery; Nickel sulfide cathode; Cycle performance
Issue Date
2013-12
Publisher
Journal of power sources
Citation
VOL 244, 764-770
Abstract
Ni3S2 powder has been fabricated by mechanical alloying Ni and S powders and the electrochemical properties of Na/Ni3S2 cells fabricated from Na anodes and Ni3S2 cathodes and 1 M sodium trifluoromethanesulfonate in tetraethyleneglycol dimethylether liquid electrolyte have been investigated. Upon discharging, the Ni3S2 cathode transformed to amorphous Na2S, Ni and residual unconverted Ni3S2. On charging, the pristine structure of Ni3S2 is fully recovered. The reversibility of this anode/cathode pair has been demonstrated and the discharge capacity loss of Na/Ni3S2 cells has been investigated over 100 cycles. From TEM, EDS, XRD, and EIS results, the degradation mechanism appears to be the formation of nano-particles of Ni3S2 and Na2S which become detached from the bulk cathode material causing the continuous increase in the interfacial resistance. Furthermore, many small cracks in Ni3S2 cathode material are caused during repeated cycling and this is an additional phenomenon that leads to further degradation of the discharge capacity during cycling.
URI
http://pubs.kist.re.kr/handle/201004/44643
ISSN
03787753
Appears in Collections:
KIST Publication > Article
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