Journal
ACS NANO
Volume 10, Issue 1, Pages 1648-1654Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b07367
Keywords
Ag nanoparticle; carbon nanotube; Coulombic efficiency; solid electrolyte interphase; lithium ion battery
Categories
Funding
- National Natural Science Foundation of China [21236003, 21522602, 21322607, 21506051]
- Shanghai Shuguang Scholars Program [13SG31]
- Program for Professor Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Chinese Ministry of Education [113026A]
- Fundamental Research Funds for the Central Universities
- Peking University
- Young Thousand Talented Program
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One of the biggest challenging issues of carbon nanomaterials for Li ion batteries (LIBs) is that they show low initial Coulombic efficiency (CE), leading to a limited specific capacity. Herein, we demonstrate a simple template self-volatilization strategy for in situ synthesis of mesoporous carbon nanotube/Ag nanoparticle (NP) hybrids (Ag-MCNTs) to boost the LIBs' performance. The key concept of Ag-MCNTs for enhancing LIBs is that a small trace of Ag NPs on MCNTS can greatly restrict the formation of a thicker solid electrolyte interphase film, which has been well verified by both transmission electron microscopy results and quantum density functional theory calculations, leading to the highest initial CE in all the reported carbon nanomaterials. This uncovered property of Ag NPs from Ag-MCNTs makes them exhibit a very high reversible capacity of 1637 mAh g(-1) after 400 discharge/charge cycles at 100 mA g(-1), approximately 5 times higher than the theoretical value of a graphite anode (372 mAh g(-1)), excellent rate capability, and long cycle life.
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