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A Natural Polymer Captor for Immobilizing Polysulfide/Polyselenide in Working Li-SeS_(2) Batteries

Nano-Micro Letters 2021年第7期13卷 55-73页

作者： Yin Zhang Menglei Wang Yi Guo Lingzhi Huang Boya Wang Yunhong Wei Peng Jing Yueying Zhang Yun Zhang Qian Wang Jingyu Sun Hao Wu Engineering Research Center of Alternative Energy Materials and Devices of Ministry of Education College of Materials Science and EngineeringSichuan UniversityChengdu 610064People’s Republic of China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province College of EnergySoochow Institute for Energy and Materials Innovations(SIEMIS)Soochow UniversitySuzhou 215006People’s Republic of China

SeS_(2) has become a promising cathode material owing to its enhanced electrical conductivity over sulfur and higher theoretical specific capacity than selenium;however,the working Li-SeS_(2) batteries have to face the practical challenges from the severe shuttling of soluble dual intermediates of polysulfide and polyselenide,especially in high-SeS_(2)-loading cathodes.Herein,a natural organic polymer,nicandra physaloides pectin(NPP),is proposed to serve as an effective polysulfide/polyselenide captor to address the shuttling issues.Informed by theoretical calculations,NPP is competent to provide a Lewis base-based strong binding interaction with polysulfides/polyselenides via forming lithium bonds,and it can be homogeneously deposited onto a three-dimensional double-carbon conductive scaffold to finally constitute a polysulfide/polyselenide-immobilizing interlayer.Operando spectroscopy analysis validates the enhanced polysulfide/polyselenide trapping and high conversion efficiency on the constructed interlayer,hence bestowing the Li-SeS_(2) cells with ultrahigh rate capability(448 mAh g^(−1)at 10 A g^(−1)),durable cycling lifespan(≈0.037%capacity attenuation rate per cycle),and high areal capacity(>6.5 mAh cm^(−2))at high SeS_(2) loading of 15.4 mg cm^(−2).Importantly,pouch cells assembled with this interlayer exhibit excellent flexibility,decent rate capability with relatively low electrolyte-to-capacity ratio,and stable cycling life even under a low electrolyte condition,promising a low-cost,viable design protocol toward practical Li-SeS_(2) batteries.

关键词： Li-SeS_(2)batteries nicandra physaloides pectin Interlayer Shuttle effect Pouch cells

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