Engineering high conductive Li7P2S8I via Cl- doping for all-solid-state Li-S batteries workable at different operating temperatures

Wu，Zhongkai1,2; Chen，Shaoqing3; Yu，Chuang1; Wei，Chaochao1; Peng，Linfeng1; Wang，Hsing Lin3; Cheng，Shijie1; Xie，Jia1

2022-08-15

10.1016/j.cej.2022.136346

CHEMICAL ENGINEERING JOURNAL   影响因子和分区

1385-8947

1873-3212

High ionic conductivity and excellent lithium compatibility for sulfide solid electrolytes are vital to developing solid-state Li-metal batteries with high energy density and safety. LiPSI has attracted significant attention due to its low cost, good stability towards lithium metal, and low annealing temperature. However, the low conductivity compared to liquid electrolyte and poor stability with Li metal at high current density limits its applications in solid-state batteries. In this work, the conductivity of LiPSI is first increased from 1.53 mS/cm to 3.08 mS/cm by Cl doping. The enhanced ionic conductivity is due to the introduction of S/Cl/I disorder structure in the structure. Then, the Li-ion conductivity of LiPSICl is enhanced up to 6.67 mS/cm via optimizing the pellet-making pressures and temperatures with the hot-press technique. Because of the superior conductivity, the assembled LiS-LiI/LiPSICl/Li-In battery delivers initial discharge capacities of 1051.0 mAh/g, 1385.0 mAh/g, and 713 mAh/g under 0.13 mAh/cm at room temperature, 60 °C, and 0 °C, respectively. Moreover, the capacity contribution of the LiPSICl electrolyte in cathode mixture are unraveled, which shows reversible charge/discharge more than 80 cycles and confirms the extra capacity from the electrolytes in the cathode mixture. The hot-press LiPSICl pellet shows excellent lithium compatibility and dendrite suppression capability, achieving stable lithium plating/stripping up to 280 h at 0.1 mA/cm. The corresponding 3LiS-LiI/LiPSICl/Li battery delivers an initial discharge capacity of 474 mAh/g at 0.13 mA/cm and capacity retention of 83% after 30 cycles. This work provides a promising strategy to explore sulfide electrolytes enabling solid-state Li-Metal battery.

Doping Hot press Ionic conductivity Li7P2S8I0.5Cl0.5 Solid electrolyte Solid-state Li-S batteries

SCI ; EI

英语

其他

Ministry of Science and Technology of China["2021YFB2500200","2021YFB2400300"] ; National Natural Science Foundation of China[52177214,51821005]

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000798115900003

ELSEVIER SCIENCE SA

20221611993014

Cathodes ; Chlorine compounds ; Ionic conduction in solids ; Ionic conductivity ; Lithium compounds ; Lithium-ion batteries ; Mixtures ; Pelletizing ; Presses (machine tools) ; Solid state devices ; Solid-State Batteries ; Sulfur compounds

Machine Tools, General:603.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Secondary Batteries:702.1.2 ; Semiconductor Devices and Integrated Circuits:714.2 ; Chemical Agents and Basic Industrial Chemicals:803

ENGINEERING

2-s2.0-85128380202

Scopus

1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan,Hubei,430074,China
2.School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan,430074,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Wu，Zhongkai,Chen，Shaoqing,Yu，Chuang,et al. Engineering high conductive Li7P2S8I via Cl- doping for all-solid-state Li-S batteries workable at different operating temperatures[J]. CHEMICAL ENGINEERING JOURNAL,2022,442.

Wu，Zhongkai.,Chen，Shaoqing.,Yu，Chuang.,Wei，Chaochao.,Peng，Linfeng.,...&Xie，Jia.(2022).Engineering high conductive Li7P2S8I via Cl- doping for all-solid-state Li-S batteries workable at different operating temperatures.CHEMICAL ENGINEERING JOURNAL,442.

Wu，Zhongkai,et al."Engineering high conductive Li7P2S8I via Cl- doping for all-solid-state Li-S batteries workable at different operating temperatures".CHEMICAL ENGINEERING JOURNAL 442(2022).