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Reducing the Charge Carrier Transport Barrier in Functionally Layer‐Graded Electrodes
Author(s) -
Zhang Yanyan,
Malyi Oleksandr I.,
Tang Yuxin,
Wei Jiaqi,
Zhu Zhiqiang,
Xia Huarong,
Li Wenlong,
Guo Jia,
Zhou Xinran,
Chen Zhong,
Persson Clas,
Chen Xiaodong
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201707883
Subject(s) - electrode , materials science , graphene , optoelectronics , layer (electronics) , ion , polarization (electrochemistry) , nanotechnology , chemistry , organic chemistry
Lithium‐ion batteries (LIBs) are primary energy storage devices to power consumer electronics and electric vehicles, but their capacity is dramatically decreased at ultrahigh charging/discharging rates. This mainly originates from a high Li‐ion/electron transport barrier within a traditional electrode, resulting in reaction polarization issues. To address this limitation, a functionally layer‐graded electrode was designed and fabricated to decrease the charge carrier transport barrier within the electrode. As a proof‐of‐concept, functionally layer‐graded electrodes composing of TiO 2 (B) and reduced graphene oxide (RGO) exhibit a remarkable capacity of 128 mAh g −1 at a high charging/discharging rate of 20 C (6.7 A g −1 ), which is much higher than that of a traditionally homogeneous electrode (74 mAh g −1 ) with the same composition. This is evidenced by the improvement of effective Li ion diffusivity as well as electronic conductivity in the functionally layer‐graded electrodes.