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Sb Nanoparticles Embedded in a Nitrogen‐Doped Carbon Matrix with Tuned Voids and Interfacial Bonds for High‐Rate Lithium Storage
Author(s) -
Wang ZhenZhen,
Qu Jin,
Hao ShuMeng,
Zhang YuJiao,
Kong FanQiang,
Yang Dongzhi,
Yu ZhongZhen
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.201800781
Subject(s) - nanocages , materials science , lithium (medication) , nanocomposite , amorphous carbon , chemical engineering , carbon fibers , graphene , nanoparticle , anode , nanotechnology , amorphous solid , electrode , composite material , composite number , chemistry , crystallography , organic chemistry , medicine , engineering , endocrinology , catalysis
Though metal based electrodes have good resistivity, their huge volume changes upon lithiation and interparticle contact resistance should be carefully stressed to achieve high rate lithium storage performances. A yolk‐hollow structure with a continuous conductive framework would solve above problems. Inspired by the yolk‐hollow structure and functions of watermelon‐flesh, we fabricated Sb/amorphous carbon/graphene nanocomposites, in which Sb nanoparticles are formed in‐situ inside the carbon nanocages that are homogeneously decorated on graphene and distributed in a continuous N‐doped amorphous carbon matrix. The generated Sb−O−C bonds improve the electron transfer rate; the carbon nanocages as mini‐electrochemical nanoreactors sustain the volume change; the conductive matrix reduces the contact resistance. The optimized nanocomposite delivers a remarkable reversible capacity of 592 mA h g −1 at 500 mA g −1 with a good cyclability for 400 cycles. A high capacity of 413 mA h g −1 is retained even after 700 cycles at 1000 mA g −1 . Such a long cycle life at the high current density has rarely been reported so far for Sb‐based lithium‐ion battery anodes.