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Li1.1V0.9O2/C Microspheres with Isomeric Core‐Shell structure and their Improved Lithium Storage Performance for Lithium‐Ion Batteries
Author(s) -
Feng Nanxiang,
Xiang Kaixiong,
Xiao Li,
Chen Wenhao,
Zhu Yirong,
Chen Han
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801068
Subject(s) - lithium (medication) , amorphous solid , materials science , scanning electron microscope , transmission electron microscopy , anode , raman spectroscopy , ion , chemical engineering , nanoparticle , amorphous carbon , nanotechnology , analytical chemistry (journal) , crystallography , chemistry , electrode , composite material , organic chemistry , medicine , physics , engineering , optics , endocrinology
Li 1.1 V 0.9 O 2 /C microspheres with isomeric core‐shell structure were synthesized by a rapid cooling and subsequent evaporative assembly approach. The prepared Li 1.1 V 0.9 O 2 /C microspheres were characterized by X‐ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) including elemental mapping analysis, and transmission electron microscopy (TEM). The core‐shell Li 1.1 V 0.9 O 2 /C microspheres display identical composition but distinct texture of cores and shells, which herein is described as isomeric structure. Amorphous carbon nanodots are uniformly dispersed in the crystalline Li 1.1 V 0.9 O 2 matrix in the core. In the shell however, Li 1.1 V 0.9 O 2 nanoparticles are embedded in an amorphous carbon network. The Li 1.1 V 0.9 O 2 /C microspheres are tested as active material for anodes in lithium‐ion batteries, and exhibit an excellent reversible capacity of 295 mAh g −1 , high capacity retention of 98 % after 100 cycles at 0.2 C and 95 % after 500 cycles at 2 C rate, and deliver wonderful rate capability of 250 mAh g −1 at 5 C. Thus, the Li 1.1 V 0.9 O 2 /C microspheres with isomeric core‐shell structure are promising candidates as anode material for commercial lithium‐ion batteries.