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Nano‐/Microstructured Si/C Composite with High Tap Density as an Anode Material for Lithium‐Ion Batteries
Author(s) -
Liu Jie,
Zhang Qian,
Wu ZhanYu,
Li JunTao,
Huang Ling,
Sun ShiGang
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402347
Subject(s) - anode , materials science , composite number , nanoparticle , electrochemistry , nanotechnology , lithium (medication) , chemical engineering , nano , carbon fibers , composite material , electrode , chemistry , medicine , endocrinology , engineering
Nanostructured Si materials are plagued by having a limited electrochemical performance and low tap density. Hence, we synthesized a nano‐/microstructured Si/C composite with Si nanoparticles uniformly embedded into a carbon matrix, which had a tap density 5.3 times higher than that of Si nanoparticles. The nano‐/microstructured Si/C composite shows a superior structural stability, which ensures a long cycle life with a capacity of 600 mAh g −1 after 1000 cycles at 420 mA g −1 . Moreover, the carbon matrix can provide three‐dimensional electron‐transfer pathways for Si nanoparticles to improve the electronic conductivity. Therefore, the Si/C composite anode material also exhibits an outstanding rate capability, which can still deliver a capacity of 510 mAh g −1 at 5 C. Thus, the nano‐/microstructured Si/C composite with a high tap density possesses great potential in view of practical applications.