Tailoring mulberry-like Fe2O3 architecture assembled by quantum dots on rGO to enable high pseudocapacitance and controllable solid electrolyte interphase
Tailoring mulberry-like Fe2O3 architecture assembled by quantum dots on rGO to enable high pseudocapacitance and controllable solid electrolyte interphase
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在rGO上定制由量子点组装的桑葚状Fe2O3结构，以实现高赝电容和可控固体电解质界面
DOI：
10.1016/j.cej.2020.124119
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发表时间：
2020-05
影响因子：
15.1
通讯作者：
Shaoyi Chen
中科院分区：
文献类型：
--
作者：
MengMa;Liyun Cao;Jiayin Li;Kai Yao;Jianfeng Huang;Hui Qi;Shaoyi Chen
构建赝电容材料以将电池级能量密度与超级电容器的循环寿命和功率密度相结合是一种有前途的能量存储技术。纳米结构可以极大地诱导非本征赝电容，但随着活性表面积的增加，过多的固体电解质中间相（SEI）通常会导致电池的库仑效率（CE）降低。在这里，我们分别研究了自组装Fe2O3“桑葚”结构，量子点和散装颗粒的电化学性能。作为锂离子电池的负极材料，桑葚结构具有良好的准电容特性和较高的电化学活性。它提供了1383.8 mAh g−1的初始容量，比相同尺寸的Fe2O3块体高22.1%，其中在0.4 mV s−1下的赝电容贡献高达80.6%。此外，桑葚结构降低了与电解质接触的活性表面，以实现有限的SEI，实现了远高于单个量子点的库仑效率的更高的库仑效率（初始CE：80.1%，平均CE：98.9%）。这一工作有望为新型高性能阳极材料的设计提供启发。
Constructing pseudocapacitive materials to combine the battery-level energy density with the cycle life and power density of supercapacitors is a promising energy storage technique. Nanostructuring can greatly induce extrinsic pseudocapacitance, but excessive solid electrolyte interphase (SEI) as the activity surface increases usually results in a poor coulombic efficiency (CE) of battery. Here, we separately investigate the electrochemical properties of self-assembled Fe2O3“mulberry” architecture, quantum dots and bulk particles. Employed as an anode of lithium ion battery, the mulberry architecture retains a dominant pseudocapacitance behavior and high electrochemical activity. It delivers an initial capacity of 1383.8 mAh g−1, 22.1% higher than Fe2O3bulk in similar size, in which the pseudocapacitance contribution up to 80.6% at 0.4 mV s−1. Furthermore, the mulberry architecture decreases the activity surface contacted with electrolyte to enable a limited SEI, achieving a higher coulombic efficiency (initial CE: 80.1%, average CE: 98.9%) well above that of individual quantum dots. This work is expected to inspire the design of novel high-performance anode materials.
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