Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 25, Pages 29726-29736Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c07898
Keywords
nanoengineering; in situ reduction; template assembly strategy; micron-sized mesoporous silicon; flexible nanotemplate; lithium-ion battery
Funding
- National Natural Science Foundation of China [51803036, 21875046, 51876044]
- State Key Program of National Natural Science Foundation of China [51633007]
- National Key R&D Program of China [2016YFA0202302]
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By using in situ reduction and template assembly strategy, a weave cage-like carbon nanostructure was successfully fabricated to wrap micron-sized mesoporous silicon, forming a robust composite structure. This structure can significantly improve the electrochemical performance and structural stability of micron-sized mesoporous silicon.
The low-cost and high-capacity micron silicon is identified as the suitable anode material for high-performance lithium-ion batteries (LIBs). However, the particle fracture and severe capacity fading during electrochemical cycling greatly impede the practical application of LIBs. Herein, we first proposed an in situ reduction and template assembly strategy to attain a weave cage-like carbon nanostructure, composed of short carbon nanotubes and small graphene flakes, as a flexible nanotemplate that closely wrapped micron-sized mesoporous silicon (PSi) to form a robust composite construction. The in situ formed weave cage-like carbon nanostructure can remarkably improve the electrochemical property and structural stability of micron-sized PSi during deep galvanostatic cycling and high electric current density owing to multiple attractive advantages. As a result, the rechargeable LIB applying this anode material exhibits improved initial Coulombic efficiency (ICE), excellent rate performance, and cyclic stability in the existing micron-sized PSi/nanocarbon system. Moreover, this anode reached an approximation of 100% ICE after only three cycles and maintains this level in subsequent cycles. This design of flexible nanotemplated platform wrapped micron-sized PSi anode provides a steerable nanoengineering strategy toward conquering the challenge of long-term reliable LIB application.
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