期刊
MATERIALS ADVANCES
卷 2, 期 17, 页码 5672-5685出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ma00471a
关键词
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资金
- Ministry of Science and Technology [MOST 107-2113-M-001-010-MY3, MOST 109-2124-M-001-004]
- Academia Sinica
- National Taiwan University
- Ministry of Education (MOE) of Taiwan
Introducing carbon into CZTS thin-films to form CZTS@C composite effectively reduces crack formation on the electrode surface, enhances electrode conductivity, and provides excellent electrochemical performance at high-current rates, offering a potential solution for developing high-power thin-film anodes for next-generation lithium-ion batteries applications.
Cu2ZnSnS4 (CZTS) has demonstrated excellent performance as an anode material for lithium-ion batteries. However, the repeated lithiation and delithiation create a cracking pattern and lead to island formation in the thin-film electrode, resulting in a capacity fading over cycling in lithium-ion batteries (LIB's). In order to control this crack behaviour, we introduce carbon into CZTS thin-films by a hydrothermal method to form CZTS@C composite. CZTS@C significantly reduced the crack pattern formation on the electrode surface as well as improved the conductivity of the CZTS@C electrode. At the early stages of lithiation and delithiation, the volume expansion and contraction of Li-CZTS@C create intra-granular cracking only at the surface level, and it offers a high capacity of about 785 mA h g(-1) after 150 cycles at 1000 mA g(-1) charging rate, excellent rate capability (942 mA h g(-1), 678 mA h g(-1) and 435 mA h g(-1) at 500 mA g(-1), 2000 mA g(-1) and 5000 mA g(-1)), and superior cyclability (925 mA h g(-1) even after 200 cycles at 500 mA g(-1)). The excellent electrochemical performance at high-current rates can be attributed to intra-granular cracking together with carbon coating that provides a short transportation length for both lithium ions and electrons. Moreover, the controlled cracking pattern formation in CZTS@C facilitates faster reaction kinetics, which open up a new solution for the development of high-power thin-film anodes for next-generation LIBs applications.
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