Details

Autor(en) / Beteiligte

• Yuan, Hui
• Tian, Xiaocong
• Han, Peipei
• Li, Cong
• Liao, Xiaobin
• Mai, Liqiang
• Yang, Rusen

Titel

Sulfide synergistic electrochemical activity for high-performance alkaline rechargeable microbatteries

Ist Teil von

• Journal of materials science, 2021, Vol.56 (1), p.629-639

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Alkaline rechargeable microbatteries have attracted considerable and sustained attention in recent years. However, the complicated fabrication process and the limited specific capacitance of electrodes are still key problems for the development of microbatteries. Herein, we develop a simple approach to enhance electrochemical activity of electrodes via rational design of material components. A sulfide synergistic bimetallic electrode composed of Ni-Co layered double hydroxides (NiCo-LDHs) and Co 4 S 3 composites (NiCo-LDHs-S) is prepared by one-step electrodeposition. Thanks to the richer redox couples in NiCo-LDHs-S and high conductivity of Co 4 S 3 , the areal capacitance of NiCo-LDHs-S cathode is ~ 5.8 times, ~ 19.7 times and 1.5 times as high as that of electrodes based on cobalt sulfur composites (Co-O-S), nickel sulfur composites (Ni-O-S) and NiCo-LDHs, respectively. A carbon-modified Fe 3 O 4 (Fe 3 O 4 @C) anode is prepared to promote electron transfer, leading to an areal capacitance of 207.2 mC cm −2 at a current density of 2 mA cm −2 . An efficient alkaline rechargeable microbattery using NiCo-LDHs-S as a cathode and Fe 3 O 4 @C as an anode is obtained and shows an areal capacitance of 61.7 mC cm −2 and an energy density of 16.4 μWh cm −2 (1.0 mW cm −2 ).