Constructing van der waals heterostructural sulfides PbTiS3 of reversible conversion-alloying mechanism for superior electrochemical lithium storage

Autor: Xiao-Ying Huang, Xiao-Hui Wu, Ke-Zhao Du, Yue-E Huang, Zhixin Chen, Li Li, Wei-Lin Lin, Chenguang Shi
Rok vydání: 2021
Předmět:
Zdroj: Carbon. 185:334-341
ISSN: 0008-6223
Popis: Metal sulfides have been universally studied as anode materials for lithium ion batteries (LIBs). Herein, we studied the lithiation storage behavior of a novel metal sulfide PbTiS3 (PTS), which is one of misfit layer compounds (MLCs) including intercalation-type TiS2 layer and conversion-alloying-type PbS layer. In-situ powder X-ray diffraction measurement reveals that the final lithiated product Li22Pb5 can be restored, indicating a reversible conversion-alloying mechanism in PTS. Theoretical calculation indicates the soft PbS interlayers of rock salt structure can hinder the distortion of TiS2 layers upon lithiation, resulting in a high structural integration of PTS anodes as well as a high concentration of intercalated Li ions. Moreover, with the assistance of the strong interfacial C–O–Pb/Ti interaction between PTS and graphene oxide (GO), PTS can be embedded in the conductive GO network which could stabilize PTS structure during long term cycling. Consequently, the fabricated LIBs anode delivers a relatively high reversible capacity (569 mA h g−1 at 2.0 A g−1 after 1000 cycles) and an outstanding high-rate capability. Besides, the assembled lithium ion full battery maintains a capacity retention of 70% after 100 cycles at 0.1 A g−1. This work provides insights into the design of MLCs as next-generation secondary batteries.
Databáze: OpenAIRE
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