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Highly efficient lithium utilization in lithium metal full-cell by simulated missile guidance and confinement systems

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Science China Materials 2021年第4期64卷 830-839页

作者： Jinqiu Zhou Haoliang Lu Xi Zhou Haoqing Ji Yawen Sun Tao Qian Chenglin Yan Soochow Institute for Energy and Materials Innovations College of EnergyKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China Institute of Chemical Industry of Forestry Products Chinese Academy of ForestryNanjing 210042China

The efficient utilization of metallic lithium(Li)is the key to enable application of Li metal full-cell with low amount of excess Li,contributing to higher safety and energy ***,we report an extraordinary Li metal full-cell with only 20%excess Li,which demonstrated significantly improved reversibility and high Coulombic *** simulated missile guidance and confinement system(SMGCS)was designed to guide and confine Li deposition through constructing compatible silver lithiophilic sites and nitrate *** sites act as effective Li nuclei to attract Li ions and direct the initial *** generated nitrate layer affords an interfacial environment favorable for confined and uniform deep Li deposition,which is theoretically verified by molecular dynamics(MD)*** two combined merits offer a robust and dendrite-free Li deposition,enabling the application of Li metal full-cell with slight excess *** also result in an outperformed Li cycling efficiency of ca.99%for over 300 cycles along with deep cycling at a high capacity of 10 mA h cm^(-2)in carbonate *** unprecedented high degree of Li utilization opens a new avenue for the future development of highly efficient Li metal full-cells.

关键词： lithium utilization lithium metal full-cell Li nucleation Li deposition

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In Situ Copolymerizated Gel Polymer Electrolyte with Cross-Linked Network for Sodium-Ion Batteries

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CCS Chemistry 2020年第1期2卷 589-597页

作者： Yu-Bin Niu Ya-Xia Yin Wen-Peng Wang Peng-Fei Wang Wei Ling Yao Xiao Yu-Guo Guo CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100190(China) University of Chinese Academy of Sciences Beijing 100049(China)

High thermal stability,nonflammability,and no liquid leakage are indispensable capabilities for electrolytes in sodium-ion batteries toward large-scale energy storage *** use of solid-state or gel polymer electrolytes has proven to be one of the enabling tools to bring about these advancements;however,their application suffer from tedious synthesis procedure and/or lowionic transport to ensure a battery ***,a novel gel polymer electrolyte with a cross-linked polyether network(GPE-CPN)was crafted through a self-catalyzed strategy,where in situ copolymerization of two monomers,1,3-dioxolane and trimethylolpropane triglycidyl ether is realized successfully,with the use of sodium hexafluorophosphate(NaPF_(6))as an initiator,at room *** demonstrate that the resultant GPE-CPN possesses a superior electrochemical stability window up to 4 V versus Na^(+)/Na,a considerable ionic conductivity,of 8.2×10^(−4)S cm^(−1) at room temperature,which is a capability good enough to suppress the growth of sodium dendrites and thus,stabilize the interface of electrolyte/sodium *** the benefit from its facile fabrication and superior characteristics,the asgenerated GPE-CPN reveals a potential application for future rechargeable sodium batteries.

关键词： sodium-ion batteries gel polymer electrolytes full-cell in situ polymerization cationic mechanism

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