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Homogenous charge distribution by free-standing porous structure for dendrite-free li metal anode

Journal of Energy Chemistry 2020年第5期29卷 68-72页

作者： Danmiao Kang Kun Tang Joonho Koh Wenbin liang John PLemmon Present address:Shangshang Road 87.liyang JiangsuChina.a National Institute of Clean-and-Low-Carbon EnergyFuture Science&Technology CityChangping DistrictBeijing 102209China NICE America Research 2091 Stierlin CtMountain ViewCA 94043United States

lithium metal has a high theoretical capacity of 3860 mAh g^-1 and a low electrochemical potential(-3.04 V vs.H2/H^+).Hence,using a lithium anode significantly improves the energy density of a secondary battery.However,the lithium dendrites generated on the lithium anode during the platingdissolution process significantly reduce its cycling life and safety.Here,we provide a simple method for lithium anode protection,by applying a free-standing porous carbon film with a high specific surface area to reduce the local current density and obtain a homogenous ion distribution.The protected lithium anode has a long cycle life over 1000 h when cycled at 3 mA cm^-2 with a lithium capacity of 2.5 mAh cm^-2.Moreover,the deposited lithium has a smoother surface than li anode without carbon protection.This study will promote the wide application of li-metal-based batteries with high safety levels.

关键词： li-metal Carbon interlayer Dendrite Charge distribution

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li/C composites as anodes for high energy density rechargeable li batteries

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Journal of Semiconductors 2019年第4期40卷 1-2页

作者： liping Wang Cheng Jiang Xiaobin Niu School of Materials and Energy State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China

Current lithium (li) ion batteries consisting of graphite as the anode and intercalation materials (such as liCoO2, liNixCoyMn1-x-yO2, liNi0.8Co0.1Al0.1O2) as the cathodes have almost reached their theoretical energy density of 300 Wh/kg. As a result, exploring high energy density batteries is urgent. li-metal taking place of the graphite as the anode has several advantages. On one hand, it has a low operational voltage (-3.04 V versus standard hydrogen electrode) and a high specific capacity of 3860 mAh/g offering the battery with high energy density. On the other hand, when the li-metal as the anode, the cathodes can be extended to li-free or li-deficient materials, which means the cathodes have more choices. For instance, S, O2, conversion reaction-type materials can be optional. While, the introduction of li-metal anodes brings in several challenges [1–3]. Firstly, li-metal is highly electrochemical and electrochemical active to have undesirable reactions with conventional carbonate-based liquid electrolytes, leading a low Coulombic efficiency and large polarizations. Secondly, the formed li dendrites due to uneven li+ distribution during plating and stripping has the chances of percolating separators leading to short circuits. Thirdly, li metal is a host-free material (~5 μm have a capacity of 1 mAh/cm2), thus it suffers from a huge volume change, which brings in difficulty in the cell design.

关键词： li-metal li/C composites rechargeable li batteries

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