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Self‐Adaptive Electrode with SWCNT Bundles as Elastic Substrate for High‐Rate and Long‐Cycle‐Life Lithium/Sodium Ion Batteries
Author(s) -
Wang Yaxiong,
Ren Jing,
Gao Xiang,
Zhang Wenjun,
Duan Huiping,
Wang Min,
Shui Jianglan,
Xu Ming
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201802913
Subject(s) - materials science , electrode , lithium (medication) , nanoparticle , nanotechnology , coaxial , carbon nanotube , anode , carbon fibers , electrical conductor , bundle , battery (electricity) , composite material , ion , composite number , chemical engineering , chemistry , medicine , power (physics) , physics , quantum mechanics , organic chemistry , electrical engineering , engineering , endocrinology
Massive volume change of active materials in lithium/sodium ion batteries (LIB/SIB) causes severe structural collapse of electrodes and fast capacity decay of batteries. Here, a coaxial composite of single‐wall carbon nanotube bundle (SWCNTB/SnO 2 ) nanoparticles (NPs)/N‐doped carbon shell (SWCNTB@SnO 2 @C) is constructed, where SWCNTBs with exceptional elasticity are explored as a self‐adaptive substrate to supply a highly resilient conductive network. Within the confinement of hard carbon shells, SWCNTB can produce radially elastic deformation to accommodate the volume change of SnO 2 during Li + /Na + insertion/extraction. This overcomes the problem of strain fracturing of the outer carbon shell, as well as maintains close electrical contact between SnO 2 and the conductive network. The LIB/SIB with the self‐adaptive SWCNTB@SnO 2 @C electrode presents a series of superior battery performances, for example, a high specific capacity of 608 mAh g −1 at 10 A g −1 and 600 cycles in LIB without capacity decay.