期刊
ACS NANO
卷 14, 期 8, 页码 10648-10654出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c04950
关键词
Li-ion capacitor; high temperature; conversion reaction; stability; biomass
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Science, ICT & Future Planning) [2019R1A4A2001527]
- Science & Engineering Research Board (SERB), a statutory body of the Department of Science & Technology (DST), Government of India [SB/S2/RJN-088/2016]
- National Research Foundation, Prime Minister's Office, Singapore under its Campus of Research Excellence and Technological Enterprise (CREATE) program under the Singapore-HUJ Alliance for Research and Enterprise Ltd (SHARE)
- Hebrew University of Jerusalem (HUJ, Israel)
- Nanyang Technological University (NTU, Singapore)
We report the excellent charge storage performance of high-energy Li-ion capacitors (LIC) fabricated from the mesoporous Co3O4 nanosheets as the conversion-type battery component and Jack fruit (Artocarpus heterophyllus) derived activated carbon as a supercapacitor electrode, especially at high temperatures (50 and 40 degrees C). Prior to the fabrication, the electrochemical prelithiation strategy was applied to Co3O4 to alleviate the irreversibility and enrich the Li-ions for electrochemical reactions (Co-0 + Li2O). The LIC delivered a maximum energy density of similar to 118 Wh kg(-1) at a high temperature of 50 degrees C. The significant difference is observed at a high rate of 2.6 kW kg(-1) at 50 degrees C with excellent cycle stability up to 3000 cycles, with a retention of similar to 87% compared with the LIC cycled at room temperature (similar to 74%). The magnificent electrochemical performance clearly demonstrates that the mesoporous structure and residual carbon synergistically facilitated the Li+/electron transport and hinder undesirable side reactions with electrolytes to realize high-energy density at high temperatures.
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