Structural Engineering of SnSe Encapsulated in Nitrogen-Doped Carbon Nanotubes for High-Performance Lithium-Ion Battery Anodes

Abstract

SnSe possesses great potential as an engaging anode candidate for lithium-ion batteries (LIBs) due to its excellent lithium storage capabilities. Nonetheless, the poor electrical conductivity and large volume expansion upon cycling greatly limit its practical application. Rational design and synthesis of the SnSe anode material with outstanding electrochemical performance are highly desirable. Herein, a one-dimensional hollow tubular structured SnSe@NCNT nanomaterial with SnSe nanoparticles encapsulated in hollow carbon nanotubes is successfully prepared by a general template method. Such a unique nanostructure combined with strong chemical bonds between SnSe and the N-doped carbon shell is propitious to alleviate the volume variation of SnSe during cycling while improving the electrochemical reaction kinetics. Consequently, the SnSe@NCNTbased LIBs demonstrate a high specific capacity of 1234.2 mAh g −1 at 0.1 A g −1 , excellent rate capability (245.3 mAh g −1 at 2.0 A g −1 ), and superior cycling stability (646.2 mAh g −1 at 1.0 A g −1 after 1000 cycles).

Design and Construction of Carbon-Coated Bimetallic Selenide Heterostructures Loaded on Reduced Graphene Oxide Substrate for Superior Lithium-Ion Storage

“…The gradual increase in capacity during cycling may be attributed to the activation of electrode materials and the reversible formation/dissolution of a conducting-type polymeric film at low potential in an alkyl carbonate solution. , Furthermore, SnSe-NiSe@C/rGO-700 exhibits higher specific capacity than reported SnSe- and NiSe-based composites (Figure S13). ,− …”