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Amorphous se species anchored into enclosed carbon skeleton bridged by chemical bonding toward advanced K-se batteries

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Journal of Energy Chemistry 2021年第10期30卷 319-326,I0010页

作者： Li Zhou Yongpeng Cui Dongqing Kong Wenting Feng Xiuli Gao Youguo Yan Hao Ren Han Hu Qingzhong Xue Zifeng Yan Wei Xing State Key Laboratory of Heavy Oil Processing School of Material Science and EngineeringChina University of PetroleumQingdao 266580ShandongChina

Potassium-selenium(K-se)batteries have attracted significant attention as one of the most promising alternatives of lithium-ion storage systems owing to high energy density and low cost.In the design of se-based cathode materials,however,the low utilization rate of active se and the rapid dissolution of polyselenides seriously weaken the capacity and cycle stability.Therefore,how to make full use of se species without loss during the charge and discharge process is the key to design high-performance se-based cathode.In this paper,a 3 D"water cube"-like se/C hybrid(denoted as se-O-PCS)is constructed with the assistance of Na_(2)CO_(3) templates.Thanks to the abundant carbonate groups(CO_(3)^(2-))originated from the Na_(2)CO_(3) templates,the molten se species are firmly anchored into the pore of carbon skeleton by strong C-O-se bonding.Thus,this unique se-O-PCS model not only improves the utilization of active se species,but also can reduce the contact with the electrolyte to inhibit the shuttle effect of polyselenides.Moreover,flexible carbon skeleton gives se-O-PCS hybrid a good electrical conductivity and excellent structural robustness.Consequently,the resultant se-O-PCS hybrid is endowed with an obviously enhanced K-ions storage property.

关键词： Potassium ion storage K-se battery se cathode Porous carbon skeleton Na_(2)CO_(3)template

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A long-life and safe lithiated graphite-selenium cell with competitive gravimetric and volumetric energy densities

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Journal of Energy Chemistry 2021年第9期30卷 556-563页

作者： Xiaoqun Qi Qiang Jin Fengyi Yang Ruining Jiang Quan Sun Long Qie Yunhui Huang Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai 201804China

Lithium-selenium(Li-se) battery is a promising system with high theoretical gravimetric and volumetric energy densities, while its long-term cyclability is hard to realize, especially when a practical se cathode with high se content, high se loading, and high density is employed. The main obstacles are the sluggish conversion kinetics of the dense se cathodes and the continuous deterioration of the Li-metal anodes.Here, by introducing an acetonitrile(AN)-based electrolyte and replacing the Li electrode with a lithiated graphite, we successfully build a hybrid conversion-intercalation system using a high-content(80 wt%),decent-loading(3.0 mg cm^(-2)), and low-porosity(44%) se cathode. The as-designed lithiated graphite||se(LG||se) cell demonstrated a high se utilization(97.4%), a long cycle life(3000 cycles), and an ultrahigh average Coulombic efficiency(99.98%). The cell also works well under lean-electrolyte(2 l L mg^(-1)) condition and shows outstanding safety performance in the nail-penetrating test. The combination affords the competitive comprehensive performances, including high volumetric and gravimetric energy densities, long cycling life, and superb safety of the LG||se cell. In addition, with a newly-designed threeelectrode pouch cell, the lithiation of the graphite anodes could be done with an in-situ lithiation process,indicating the high potential of the as-proposed LG||se cell for the practical applications.

关键词： Conversion-intercalation Acetonitrile electrolyte se cathode Lithiated graphite Energy density

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