3 years ago

Reducing the Charge Carrier Transport Barrier in Functionally Layer-Graded Electrodes

Reducing the Charge Carrier Transport Barrier in Functionally Layer-Graded Electrodes
Xiaodong Chen, Zhong Chen, Xinran Zhou, Jia Guo, Wenlong Li, Yuxin Tang, Jiaqi Wei, Zhiqiang Zhu, Oleksandr I. Malyi, Clas Persson, Huarong Xia, Yanyan Zhang
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 TiO2(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. A functionally graded electrode was developed to address reaction polarization issue in lithium-ion batteries by increasing effective Li ion diffusivity as well as electronic conductivity. As evidence, a layer-graded electrode composed of TiO2(B) and reduced graphene oxide exhibits much higher capacity (128 mAh g−1) than that of traditional homogeneous electrode (74 mAh g−1) at a high charging current density of 6.7 A g−1.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201707883

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