coated separator
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2022 ◽  
Vol 430 ◽  
pp. 132678
Author(s):  
Zhuangzhuang Wei ◽  
Nanxiang Zhang ◽  
Tao Feng ◽  
Feng Wu ◽  
Teng Zhao ◽  
...  

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 322
Author(s):  
Ryo Shomura ◽  
Ryota Tamate ◽  
Shoichi Matsuda

Lithium metal anode is regarded as the ultimate negative electrode material due to its high theoretical capacity and low electrochemical potential. However, the significantly high reactivity of Li metal limits the practical application of Li metal batteries. To improve the stability of the interface between Li metal and an electrolyte, a facile and scalable blade coating method was used to cover the commercial polyethylene membrane separator with an inorganic/organic composite solid electrolyte layer containing lithium-ion-conducting ceramic fillers. The coated separator suppressed the interfacial resistance between the Li metal and the electrolyte and consequently prolonged the cycling stability of deposition/dissolution processes in Li/Li symmetric cells. Furthermore, the effect of the coating layer on the discharge/charge cycling performance of lithium-oxygen batteries was investigated.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jieqiong Qin ◽  
Haodong Shi ◽  
Kai Huang ◽  
Pengfei Lu ◽  
Pengchao Wen ◽  
...  

AbstractSodium metal batteries are considered one of the most promising low-cost high-energy-density electrochemical energy storage systems. However, the growth of unfavourable Na metal deposition and the limited cell cycle life hamper the application of this battery system at a large scale. Here, we propose the use of polypropylene separator coated with a composite material comprising polydopamine and multilayer graphene to tackle these issues. The oxygen- and nitrogen- containing moieties as well as the nano- and meso- porous network of the coating allow cycling of Na metal electrodes in symmetric cell configuration for over 2000 h with a stable 4 mV overpotential at 1 mA cm−2. When tested in full Na || Na3V2(PO4)3 coin cell, the coated separator enables the delivery of a stable capacity of about 100 mAh g−1 for 500 cycles (90% capacity retention) at a specific current of 235 mA g−1 and satisfactory rate capability performances (i.e., 75 mAh g−1 at 3.5 A g−1).


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Pan Xiong ◽  
Fan Zhang ◽  
Xiuyun Zhang ◽  
Yifan Liu ◽  
Yunyan Wu ◽  
...  

AbstractThe regulation of anions and cations at the atomic scale is of great significance in membrane-based separation technologies. Ionic transport regulation techniques could also play a crucial role in developing high-performance alkali metal batteries such as alkali metal-sulfur and alkali metal-selenium batteries, which suffer from the non-uniform transport of alkali metal ions (e.g., Li+ or Na+) and detrimental shuttling effect of polysulfide/polyselenide anions. These drawbacks could cause unfavourable growth of alkali metal depositions at the metal electrode and irreversible consumption of cathode active materials, leading to capacity decay and short cycling life. Herein, we propose the use of a polypropylene separator coated with negatively charged Ti0.87O2 nanosheets with Ti atomic vacancies to tackle these issues. In particular, we demonstrate that the electrostatic interactions between the negatively charged Ti0.87O2 nanosheets and polysulfide/polyselenide anions reduce the shuttling effect. Moreover, the Ti0.87O2-coated separator regulates the migration of alkali ions ensuring a homogeneous ion flux and the Ti vacancies, acting as sub-nanometric pores, promote fast alkali-ion diffusion.


2021 ◽  
Vol 290 ◽  
pp. 129512
Author(s):  
Xuejian Zhang ◽  
Linlin Chen ◽  
Zhen Yang ◽  
Xiangyun Qiu ◽  
Zongmin Zheng

Author(s):  
Longqing Peng ◽  
Xin Wang ◽  
Jianhui Dai ◽  
Xiu Shen ◽  
Boyang Huang ◽  
...  

A rational design for a reinforced ceramic-coated separator that has been further modified with polypyrrole is reported. The thermal-dimensional stability of the separator is greatly improved without increasing its thickness.


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