DataVXACS Applied Materials & InterfacesPaper
journal article·2020-08-12

Direct Observation of Li Migration into V5S8: Order to Antisite Disorder Intercalation Followed by the Topotactic-Based Conversion Reaction

Shulin Chen, Chen Yang, Ruiwen Shao, Jingjing Niu, Mei Wu, Jian Cao, Xiumei Ma, Jicai Feng, Xiaosong Wu, Jing Lu, Liping Wang, Junlei Qi, Peng Gao

ACS Applied Materials & Interfaces· Volume 12· Issue 32
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Source abstract

Abstract

Two-dimensional transition-metal dichalcogenides hold great potential in rechargeable lithium-ion batteries. Their electrochemical properties are closely related to the structural evolutions during lithium-ion migration. Understanding these migration/reaction mechanisms is important to help improve battery performance. Herein, we report the real-time and atomic-scale observation of phase transitions during the lithiation and delithiation for V5S8 via in situ electron diffraction and high-resolution transmission electron microscopy techniques. We find that the phase transformation proceeds via a sequence of order to antisite disorder intercalation and topotactic-based conversion reaction. During the intercalation reaction, the lithium ion destroys the orderings of the interstitial V with the formation of Li/V antisite. Such a reaction is found to be reversible, i.e., the extraction of lithium from LixV5S8 leads to the recovery of V orderings. The conversion reaction involves heterogeneous nucleation of Li2S with 3–20 nm nanodomains, which maintain the crystallographic integrity with LixV5S8. These findings elucidate the complex interactions between the lithium ion and host V5S8 during ionic migration in solids, which should be helpful in understanding the relationship between phase transformation kinetics and battery performance.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storageNanomaterials

OpenAlex topics: Advancements in Battery Materials · MXene and MAX Phase Materials · Extraction and Separation Processes

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China

State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China

Beijing Advanced Innovation Center for Intelligent Robots and Systems, Institute of Convergence in Medicine and Engineering, Beijing Institute of Technology, Beijing 10081, China

International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China

Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China

Funding

Peking University · Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · Government of Guangdong Province · Natural Science Foundation of Heilongjiang Province · Tsinghua University · National Natural Science Foundation of China

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