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75. Borohydride Ammoniate Solid Electrolyte Design for All‐Solid‐State Mg Batteries.

Author

Pang, Yuepeng, Nie, Zhengfang, Xu, Fen, Sun, Lixian, Yang, Junhe, Sun, Dalin, Fang, Fang, and Zheng, Shiyou

Subjects
SOLID electrolytes, BOROHYDRIDE, CRITICAL currents, STORAGE batteries
Abstract

Searching for novel solid electrolytes is of great importance and challenge for all‐solid‐state Mg batteries. In this work, we develop an amorphous Mg borohydride ammoniate, Mg(BH4)2·2NH3, as a solid Mg electrolyte that prepared by a NH3 redistribution between 3D framework‐γ‐Mg(BH4)2 and Mg(BH4)2·6NH3. Amorphous Mg(BH4)2·2NH3 exhibits a high Mg‐ion conductivity of 5 × 10−4 S cm−1 at 75 °C, which is attributed to the fast migration of abundant Mg vacancies according to the theoretical calculations. Moreover, amorphous Mg(BH4)2·2NH3 shows an apparent electrochemical stability window of 0–1.4 V with the help of in‐situ formed interphases, which can prevent further side reactions without hindering the Mg‐ion transfer. Based on the above superiorities, amorphous Mg(BH4)2·2NH3 enables the stable cycling of all‐solid‐state Mg cells, as the critical current density reaches 3.2 mA cm−2 for Mg symmetrical cells and the reversible specific capacity reaches 141 mAh g−1 with a coulombic efficiency of 91.7% (first cycle) for Mg||TiS2 cells. [ABSTRACT FROM AUTHOR]

Published
2024
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87. Engineering CoMoO4in reduced graphene oxide as superior cathode hosts for advanced room-temperature sodium-sulfur batteries

Author

Ye, Xin, Luo, Sainan, Li, Zhiqi, Ruan, Jiafeng, Pang, Yuepeng, Yang, Junhe, Wang, John, and Zheng, Shiyou

Abstract

The CoMoO4decorated reduced graphene oxide (CoMoO4@rGO) is successfully prepared as advanced room-temperature (RT) Na-S battery cathodes. Sodium polysulfides are strongly anchored by the CoMoO4@rGO host and then rapidly converted to lower order products by CoMoO4catalysis. This work provides a new idea for the design of RT Na-S battery cathode, paving the way for the development of efficient and low-cost energy storage systems.

Published
2023
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