Obrezkov Filipp A, Ramezankhani Vahid, Zhidkov Ivan, Traven Valerii F, Kurmaev Ernst Z, Stevenson Keith J, Troshin Pavel A
Skolkovo Institute of Science and Technology , Nobel St. 3 , Moscow 143026 , Russia.
Institute of Physics and Technology, Ural Federal University , Mira str. 19 , Yekaterinburg 620002 , Russia.
J Phys Chem Lett. 2019 Sep 19;10(18):5440-5445. doi: 10.1021/acs.jpclett.9b02039. Epub 2019 Sep 7.
Polymeric aromatic amines were shown to be very promising cathodes for lithium-ion batteries. Surprisingly, these materials are scarcely used for designing post-lithium batteries. In this Letter, we investigate the application of the high-voltage poly(-phenyl-5,10-dihydrophenazine) (p-DPPZ) cathodes for K-ion batteries. The designed batteries demonstrate an impressive specific capacity of 162 mAh g at the current density of 200 mA g, operate efficiently at high current densities of 2-10 A g, enabling charge and discharge within ∼1-4 min, and deliver the specific capacity of 125-145 mAh g with a retention of 96 and 79% after 100 and 1000 charge-discharge cycles, respectively. Finally, these K-ion batteries with polymeric p-DPPZ cathodes showed rather outstanding specific power of >3 × 10 W kg, thus paving a way to the design of ultrafast and durable high-capacity metal-ion batteries matching the increasing demand for high power and high energy density electrochemical energy storage devices.
聚合物芳香胺被证明是非常有前景的锂离子电池阴极材料。令人惊讶的是，这些材料很少用于设计后锂电池。在本信函中，我们研究了高压聚（-苯基-5,10-二氢吩嗪）（p-DPPZ）阴极在钾离子电池中的应用。所设计的电池在200 mA g的电流密度下展现出令人印象深刻的162 mAh g的比容量，在2-10 A g的高电流密度下能高效运行，可在约1-4分钟内实现充放电，并且在100次和1000次充放电循环后分别具有125-145 mAh g的比容量以及96%和79%的容量保持率。最后，这些采用聚合物p-DPPZ阴极的钾离子电池展现出相当出色的>3×10 W kg的比功率，从而为设计超快且耐用的高容量金属离子电池铺平了道路，以满足对高功率和高能量密度电化学储能装置日益增长的需求。
