scholarly journals In Situ Monitoring the Potassium-Ion Storage Enhancement in Iron Selenide with Ether-Based Electrolyte

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Xiaodan Li ◽  
Jinliang Li ◽  
Wenchen Zhuo ◽  
Zhibin Li ◽  
Liang Ma ◽  
...  

AbstractAs one of the promising anode materials, iron selenide has received much attention for potassium-ion batteries (KIBs). Nevertheless, volume expansion and sluggish kinetics of iron selenide result in the poor reversibility and stability during potassiation–depotassiation process. In this work, we develop iron selenide composite matching ether-based electrolyte for KIBs, which presents a reversible specific capacity of 356 mAh g−1 at 200 mA g−1 after 75 cycles. According to the measurement of mechanical properties, it is found that iron selenide composite also exhibits robust and elastic solid electrolyte interphase layer in ether-based electrolyte, contributing to the improvement in reversibility and stability for KIBs. To further investigate the electrochemical enhancement mechanism of ether-based electrolyte in KIBs, we also utilize in situ visualization technique to monitor the potassiation–depotassiation process. For comparison, iron selenide composite matching carbonate-based electrolyte presents vast morphology change during potassiation–depotassiation process. When changing to ether-based electrolyte, a few minor morphology changes can be observed. This phenomenon indicates an occurrence of homogeneous electrochemical reaction in ether-based electrolyte, which results in a stable performance for potassium-ion (K-ion) storage. We believe that our work will provide a new perspective to visually monitor the potassium-ion storage process and guide the improvement in electrode material performance.

Nano Energy ◽  
2021 ◽  
pp. 106233
Author(s):  
Kuan-Ting Chen ◽  
Yi-Chun Yang ◽  
Lian-Ming Lyu ◽  
Ming-Yen Lu ◽  
Hsing-Yu Tuan
Keyword(s):  

2019 ◽  
Vol 23 ◽  
pp. 46-54 ◽  
Author(s):  
Jiafeng Ruan ◽  
Yahui Zhao ◽  
Sainan Luo ◽  
Tao Yuan ◽  
Junhe Yang ◽  
...  

2020 ◽  
Vol 56 (60) ◽  
pp. 8392-8395 ◽  
Author(s):  
Jiaying Liao ◽  
Qiao Hu ◽  
Jinxiao Mu ◽  
Fei Chen ◽  
Xiaodong He ◽  
...  

An in situ formed polyaniline pillared layered titanate with uniform TiO2 coating for sodium and potassium ion storage is proposed.


2019 ◽  
Vol 131 (41) ◽  
pp. 14882-14889 ◽  
Author(s):  
Junpeng Xie ◽  
Xiaodan Li ◽  
Haojie Lai ◽  
Zhijuan Zhao ◽  
Jinliang Li ◽  
...  

Small ◽  
2019 ◽  
Vol 16 (2) ◽  
pp. 1905789 ◽  
Author(s):  
Yuanxin Zhao ◽  
Xiaochuan Ren ◽  
Zhenjiang Xing ◽  
Daming Zhu ◽  
Weifeng Tian ◽  
...  

Nanoscale ◽  
2021 ◽  
Author(s):  
Xuechun Li ◽  
Huanlei Wang ◽  
Wenzhe Zhang ◽  
Wenrui Wei ◽  
Ranxia Liao ◽  
...  

The development of carbon materials for potassium storage is limited by the low specific capacity and poor cycling stability due to the sluggish kinetics of K ions. Herein, fucoidan-derived oxygen-rich...


2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Jingsheng Cai ◽  
Ran Cai ◽  
Zhongti Sun ◽  
Xiangguo Wang ◽  
Nan Wei ◽  
...  

AbstractTitanium dioxide (TiO2) has gained burgeoning attention for potassium-ion storage because of its large theoretical capacity, wide availability, and environmental benignity. Nevertheless, the inherently poor conductivity gives rise to its sluggish reaction kinetics and inferior rate capability. Here, we report the direct graphene growth over TiO2 nanotubes by virtue of chemical vapor deposition. Such conformal graphene coatings effectively enhance the conductive environment and well accommodate the volume change of TiO2 upon potassiation/depotassiation. When paired with an activated carbon cathode, the graphene-armored TiO2 nanotubes allow the potassium-ion hybrid capacitor full cells to harvest an energy/power density of 81.2 Wh kg−1/3746.6 W kg−1. We further employ in situ transmission electron microscopy and operando X-ray diffraction to probe the potassium-ion storage behavior. This work offers a viable and versatile solution to the anode design and in situ probing of potassium storage technologies that is readily promising for practical applications.


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