Researchers from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) and Yanshan University developed a high-rate anode material for lithium ion battery (LIB). The results were published in Advanced Materials.
Niobium pentoxide (Nb2O5) possesses a high specific capacity and fast Li storage kinetics in a safe operating potential window, which is suitable for high-rate battery systems. H-Nb2O5 exhibits the highest specific capacity of more than 250 mAh/g (1.0~3.0 V vs Li+/Li) among most configurations of Nb2O5.
However, the crystal structure of H-Nb2O5 would change during Li+ (de)intercalation, accompanied with the generation of certain irreversible and inactive phase. That is the main hinderance of H-Nb2O5 anodes in practical applications for LIBs.
The scientists in DICP found that optimizing homogeneity of electron and Li-ion transports surrounding the crystals could improve the capacity and cycling life at high rates.
They introduced an amorphous N-doped carbon layer on the micrometer single-crystal H-Nb2O5 particle (N-C@MSC-Nb2O5) to optimize the homogeneity of phase transition and to suppress the irreversible structure changes.
N-C@MSC-Nb2O5 exhibited a long cycling life of over 1000 charge/discharge cycles at a high current density of 2000 mA/g, 10 times longer than that of pristine H-Nb2O5.
Moreover, N-C@MSC-Nb2O5 also showed a better rate performance than Li4Ti5O12-based and other Nb2O5-based anode materials. In addition, the inherent principle is further conformed via operando transmission electron microscopy (TEM) and X-ray diffraction (XRD).
According to a recent study, researchers from the Hefei Institutes of Physical Science have prepared high-performance cathode materials for lithium-rich manganese-based lithium-ion batteries. They carried out sulfur doping and in-situ growth of coherent spinel phase synch...
A research group led by Prof. ZHANG Huamin, Prof. LI Xianfeng and Prof. ZHANG Hongzhang from the Dalian Institute of Chemical Physics, in collaboration with Prof. WANG Qingsong from the University of Science and Technology of China, developed a "Giving comes before receiv...
86-10-68597521 (day)
86-10-68597289 (night)
86-10-68511095 (day)
86-10-68512458 (night)
cas_en@cas.cn
52 Sanlihe Rd., Xicheng District,
Beijing, China (100864)
Copyright © 2002 - Chinese Academy of Sciences
