期刊
ENERGY STORAGE MATERIALS
卷 52, 期 -, 页码 76-84出版社
ELSEVIER
DOI: 10.1016/j.ensm.2022.07.025
关键词
Lithium metal battery; MXene; Ti(3)CNTx; Defect; Ti vacancy
资金
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [2021M3H4A1A03047327, 2022R1A2C3006227]
- Fundamental R&D Program for Core Technology of Materials and the Industrial Strategic Technology Development Program - Ministry of Trade, Industry and Energy, Republic of Korea [20020855]
- Sungkyunkwan University [S-2022-0096-000]
- National Research Council of Science & Technology (NST) grant by the Korea Government (MSIT) [CRC22031-000]
- KIST Institutional Program [2E31201]
- KISTI Supercomputing Center [KSC-2020-CRE-0361]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20020855] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2022R1A2C3006227] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
By constructing a highly defective titanium-carbonitride (Ti3CNTx)-MXene-based fiber membrane as a dendrite-free anode substrate, the charge efficiency and cycling stability of lithium metal batteries can be improved, while increasing the energy density and power density.
Lithium metal batteries (LMBs) have attracted increasing attention owing to their high theoretical capacity and low reduction potential. However, safety concerns and their low coulombic efficiencies (CE) arising from the nonuniform and irreversible formation of Li dendrites on their anodes hinder their practical application. Here, we demonstrate that a highly defective titanium-carbonitride (Ti3CNTx)-MXene-based fiber membrane can function as a dendrite-free anode substrate for LMBs. The Ti3CNTx fiber membrane electrodes, prepared via the electrostatic self-assembly of Ti3CNTx flakes onto a glass-fiber membrane substrate, had a high surface area (similar to 276 m(2) g(-1)), leading to a high CE of similar to 99.1%, excellent cycling stability of more than 1000 cycles in a Li half-cell test, and high energy density (581.78 W h kg(-1)) and high power density (3008 W kg(-1)) in a Li-MXene-fiber/NCM622 full-battery test. This excellent cell performance is attributed to the strong lithiophilicity and high density of Ti vacancy defects in the Ti3CNTx MXenes, as well as the high surface area of the fiber membrane electrode. The lithiophilicity and defect structure of Ti3CNTx MXenes in LMB operation were elucidated by DFT calculations.
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