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Facile synthesis of amorphous Cr 2 O 3 /N‐doped carbon nanosheets and its excellent lithium storage property
Author(s) -
Zhang Deyin,
Qin Mingli,
Huang Min,
Wu Haoyang,
Jia Baorui,
Liu Zhiwei,
Liu Tingting,
Qu Xuanhui,
Cao Peng
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15478
Subject(s) - anode , amorphous solid , materials science , lithium (medication) , amorphous carbon , carbon fibers , chemical engineering , doping , chemistry , crystallography , electrode , composite material , composite number , medicine , optoelectronics , engineering , endocrinology
The Cr 2 O 3 with high‐energy density and relatively low lithium insertion potential is a promising anode candidate for LIB s. However, the intrinsic poor electroconductivity and side effects like volume expansion of Cr 2 O 3 severely limit its capacity and cyclability at high charge/discharge rates. To address the problem, the amorphous Cr 2 O 3 /N‐doped carbon nanosheets (denoted as a ‐Cr 2 O 3 / NC ) have been designed and prepared by an easy one‐step solution combustion synthesis method from a uniform solution of chromium nitrate, glucose, and glycine. The as‐synthesized a ‐Cr 2 O 3 / NC consist of amorphous Cr 2 O 3 particles and N‐doped carbon sheet, where the amorphous Cr 2 O 3 is evenly encapsulated in the carbon sheet support. An anode prepared from the synthesized a ‐Cr 2 O 3 / NC demonstrates much higher specific capacity and better cycling performance than the crystalline Cr 2 O 3 anode. Upon extended cycling, the a ‐Cr 2 O 3 / NC anode exhibits good long‐term stability and its reversible capacity retains as high as 782.4 mA h g −1 after 500 cycles at 1 A g −1 . Such good performance stems from its unique structure. The amorphous structure of Cr 2 O 3 can furnish a mass of enterable active sites which can favor the lithium ions insertion/extraction, whereas the sheet‐like N‐doped carbon support can increase the electroconductivity and facilitate the transportation of lithium ions and electrons.