首页|Mitigated reaction kinetics between lithium metal anodes and electrolytes by alloying lithium metal with low-content magnesium
Mitigated reaction kinetics between lithium metal anodes and electrolytes by alloying lithium metal with low-content magnesium
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Lithium(Li)metal is regarded as a promising anode candidate for high-energy-density rechargeable bat-teries.Nevertheless,Li metal is highly reactive against electrolytes,leading to rapid decay of active Li metal reservoir.Here,alloying Li metal with low-content magnesium(Mg)is proposed to mitigate the reaction kinetics between Li metal anodes and electrolytes.Mg atoms enter the lattice of Li atoms,form-ing solid solution due to the low amount(5 wt％)of Mg.Mg atoms mainly concentrate near the surface of Mg-alloyed Li metal anodes.The reactivity of Mg-alloyed Li metal is mitigated kinetically,which results from the electron transfer from Li to Mg atoms due to the electronegativity difference.Based on quanti-tative experimental analysis,the consumption rate of active Li and electrolytes is decreased by using Mg-alloyed Li metal anodes,which increases the cycle life of Li metal batteries under demanding conditions.Further,a pouch cell(1.25 Ah)with Mg-alloyed Li metal anodes delivers an energy density of 340 Wh kg-1 and a cycle life of 100 cycles.This work inspires the strategy of modifying Li metal anodes to kinet-ically mitigate the side reactions with electrolytes.
Lithium metal anodesAlloyingAnode/electrolyte interfaceReaction kineticsPouch cell
School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China
Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China
Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China
College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,Zhejiang,China
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National Key Research and Development ProgramNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBeijing Institute of Technology"Xiaomi Young Scholars"program
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