TY - JOUR
T1 - Neuron-Mimic Smart Electrode
T2 - A Two-Dimensional Multiscale Synergistic Strategy for Densely Packed and High-Rate Lithium Storage
AU - Yu, Jia
AU - Wang, Yanlei
AU - Kong, Long
AU - Chen, Shimou
AU - Zhang, Suojiang
N1 - Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/8/27
Y1 - 2019/8/27
N2 - Conventional microsized and nanosized secondary battery electrodes inevitably suffer from poor rate capability and low tap density, respectively. Inspired by a multipolar neuron consisting of a centric micron-soma and multiple divergent nanodendrites, we propose a smart electrode design based on a two-dimensional (2D) multiscale synergistic strategy, for addressing both of the above problems. As a proof of concept, multiple Zn-doped Co-based regional-nanoarrays are grown on one Co-doped Zn-based micron-star in a 2D mode via a facile one-pot liquid-phase process, serving as a representative neuron-mimic anode for lithium-ion batteries. The 2D assembly well retains the tap density advantage derived from the micron-star subunit. Combined analysis of three-dimensional tomographic reconstruction, Li-storage kinetics, and in situ transmission electron microscopy reveal a smart electrochemical behavior similar to a neuron working mechanism, which significantly enhances rate capability as compared to the single micron-star subunit. A mutual-doping effect also benefits high-rate lithium storage as verified by density functional theory calculations. As expected, superior reversible areal capacity (2.52 mA h cm-2), high long-term capacity retention (<0.024% loss per cycle over 800 cycles after initial 5 cycles), and enhanced rate capability (1 order of magnitude higher than the microsized electrode) are obtained, accompanied by considerable high-temperature endurance.
AB - Conventional microsized and nanosized secondary battery electrodes inevitably suffer from poor rate capability and low tap density, respectively. Inspired by a multipolar neuron consisting of a centric micron-soma and multiple divergent nanodendrites, we propose a smart electrode design based on a two-dimensional (2D) multiscale synergistic strategy, for addressing both of the above problems. As a proof of concept, multiple Zn-doped Co-based regional-nanoarrays are grown on one Co-doped Zn-based micron-star in a 2D mode via a facile one-pot liquid-phase process, serving as a representative neuron-mimic anode for lithium-ion batteries. The 2D assembly well retains the tap density advantage derived from the micron-star subunit. Combined analysis of three-dimensional tomographic reconstruction, Li-storage kinetics, and in situ transmission electron microscopy reveal a smart electrochemical behavior similar to a neuron working mechanism, which significantly enhances rate capability as compared to the single micron-star subunit. A mutual-doping effect also benefits high-rate lithium storage as verified by density functional theory calculations. As expected, superior reversible areal capacity (2.52 mA h cm-2), high long-term capacity retention (<0.024% loss per cycle over 800 cycles after initial 5 cycles), and enhanced rate capability (1 order of magnitude higher than the microsized electrode) are obtained, accompanied by considerable high-temperature endurance.
KW - biomimetic electrode
KW - lithium-ion battery
KW - multiscale structure
KW - smart electrochemical behavior
KW - two-dimensional assembly
UR - http://www.scopus.com/inward/record.url?scp=85070541890&partnerID=8YFLogxK
U2 - 10.1021/acsnano.9b03474
DO - 10.1021/acsnano.9b03474
M3 - 文章
C2 - 31334630
AN - SCOPUS:85070541890
SN - 1936-0851
VL - 13
SP - 9148
EP - 9160
JO - ACS Nano
JF - ACS Nano
IS - 8
ER -