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Synthesis of Olive‐Like Nitrogen–Doped Carbon with Embedded Ge Nanoparticles for Ultrahigh Stable Lithium Battery Anodes
Author(s) -
Ma Xiaomei,
Zhou Yongning,
Chen Min,
Wu Limin
Publication year - 2017
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.201700403
Subject(s) - anode , materials science , nanoparticle , carbon fibers , lithium (medication) , chemical engineering , doping , germanium , nitrogen , lithium ion battery , battery (electricity) , nanotechnology , electrode , composite material , chemistry , organic chemistry , optoelectronics , composite number , silicon , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
The development of environment‐friendly and high‐performance carbon materials for energy applications has remained a great challenge. Here, a novel and facile method for synthesis of olive‐like nitrogen‐doped carbon embedded with germanium (Ge) nanoparticles using widespread and nontoxic dopamine as carbon and nitrogen precursors is demonstrated, especially by understanding the tendency of pure GeO 2 nanoparticles forming ellipsoidal aggregation, and the chelating reaction of the catechol structure in dopamine with metal ions. The as‐synthesized Ge/N‐C composites show an olive‐like porous carbon structure with a loading weight of as high as 68.5% Ge nanoparticles. A lithium ion battery using Ge/N‐C as the anode shows 1042 mAh g −1 charge capacity after 2000 cycles (125 d) charge/discharge at C/2 (1C = 1600 mA g −1 ) with a capacity maintaining efficiency of 99.6%, significantly exceeding those of the previously reported Ge/C‐based anode materials. This prominent cyclic charge/discharge performance of the Ge/N‐C anode is attributed to the well‐dispersed Ge nanoparticles in graphitic N‐doped carbon matrix, which facilitates high rates (0.5–15 C) of charge/discharge and increases the anode structure integrity. The synthesis strategy presented here may be a very promising approach to prepare a series of active nanoparticle–carbon hybrid materials with nitrogen doping for more and important applications.