Kavli Affiliate: Wei Gao
| First 5 Authors: Xiaohui Yan, Yue He, Xuncheng Liu, Siqi Jing, Jiajian Guan
| Summary:
The further development of fast electrochemical devices is hindered by
self-discharge. Current strategies for suppressing self-discharge are mainly
focused on the extrinsic and general mechanisms including faradaic reactions,
charge redistribution, and ohmic leakage. However, the self-discharge process
is still severe for conventional supercapacitors. Herein, we unravel the
deterministic effect of solid-state diffusion energy barrier by constructing
conjugately configured supercapacitors based on pairs of pre-lithiated niobium
oxides with similar intercalation pseudocapacitive process but different
phases. This device works with a single type of charge carrier while materials
with various diffusion barriers can be implanted, thus serving as an ideal
platform to illustrate the influence of the diffusion barrier. The results show
that the comprehensive effect of solid-state diffusion energy barrier and
extrinsic effects drives the self-discharge process. Noteworthy, the diffusion
barrier presents with an exponential form, which governs the self-discharge of
supercapacitors. This work is expected to unravel the deterministic effect of
the solid-state diffusion energy barrier and provide a general guidance for
suppressing self-discharge for supercapacitors.
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