TY - JOUR
T1 - Acidity Modulation of Electrolyte Enables High Reversible Mn2+/MnO2 Electrode Reaction of Electrolytic Zn-MnO2 Battery
AU - Feng, Zhongyuan
AU - Gao, Zhengyuan
AU - Xue, Zhiyang
AU - Yang, Meng
AU - Zhao, Xiangyu
N1 - Publisher Copyright:
© 2022, The Minerals, Metals & Materials Society.
PY - 2022/11
Y1 - 2022/11
N2 - An electrolytic Zn-MnO2 battery based on a deposition/dissolution mechanism has shown great prospects in energy storage applications, due to its low cost and high energy density. However, the multi-electron electrochemical reaction of the manganese-based cathode in this battery depends on the electrolyte acidity. Here, the reaction mechanism at the cathode side is investigated when electrolytes with different acidities are used. The results show that the Mn2+/MnO2 deposition/dissolution and the cation intercalation coexist in the cathode of the electrolytic Zn-MnO2 battery when the electrolyte has a pH > 0.4. The battery exhibits an unstable variation of coulombic efficiency. Upon the increase of the proton concentration in the electrolyte, the manganese-based cathode demonstrated a one-step deposition/dissolution mechanism, which benefits a high discharge voltage up to 2 V of the battery and a stable coulombic efficiency of above 90%. This work provides a useful electrolyte design for electrolytic Zn-MnO2 batteries.
AB - An electrolytic Zn-MnO2 battery based on a deposition/dissolution mechanism has shown great prospects in energy storage applications, due to its low cost and high energy density. However, the multi-electron electrochemical reaction of the manganese-based cathode in this battery depends on the electrolyte acidity. Here, the reaction mechanism at the cathode side is investigated when electrolytes with different acidities are used. The results show that the Mn2+/MnO2 deposition/dissolution and the cation intercalation coexist in the cathode of the electrolytic Zn-MnO2 battery when the electrolyte has a pH > 0.4. The battery exhibits an unstable variation of coulombic efficiency. Upon the increase of the proton concentration in the electrolyte, the manganese-based cathode demonstrated a one-step deposition/dissolution mechanism, which benefits a high discharge voltage up to 2 V of the battery and a stable coulombic efficiency of above 90%. This work provides a useful electrolyte design for electrolytic Zn-MnO2 batteries.
KW - Electrolytic Zn-MnO batteries
KW - deposition/dissolution mechanism
KW - pH regulation
KW - two-electron reaction
UR - http://www.scopus.com/inward/record.url?scp=85136097942&partnerID=8YFLogxK
U2 - 10.1007/s11664-022-09845-8
DO - 10.1007/s11664-022-09845-8
M3 - 文章
AN - SCOPUS:85136097942
SN - 0361-5235
VL - 51
SP - 6041
EP - 6046
JO - Journal of Electronic Materials
JF - Journal of Electronic Materials
IS - 11
ER -