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Three-Dimensional Porous Frameworks for Li Metal Batteries: Superconformal versus Conformal Li Growth

Three-Dimensional Porous Frameworks for Li Metal Batteries: Superconformal versus Conformal Li Growth
Lee, JeonghyeopWon, Eun-SeoKim, Dong-MinKim, HyunchulKwon, BomeePark, KyobinJo, SeunghyeonLee, SuyeonLee, Jong-WonLee, Kyu Tae
DGIST Authors
Lee, Jeonghyeop; Won, Eun-Seo; Kim, Dong-Min; Kim, Hyunchul; Kwon, Bomee; Park, Kyobin; Jo, Seunghyeon; Lee, Suyeon; Lee, Jong-Won; Lee, Kyu Tae
Issue Date
ACS Applied Materials and Interfaces, 13(28), 33056-33065
Author Keywords
lithium dendritelithium metalpore structuresuperconformal electrodepositionthree-dimensional porous framework
Theoretical capacityMetalsCharge transferElectrodepositionElectrodesLithium-ion batteriesPlatingPore sizePore structureCapacity retentionCharge transfer resistanceCycle performanceElectrochemical performanceIonic resistanceSuperconformal electrodepositionSuperconformal plating
Li metal batteries have been considered a promising alternative to Li-ion batteries because of the high theoretical capacity of the Li metal. There have been remarkable improvements in the electrochemical performance of Li metal electrodes, although the current Li metal technology is not sufficiently practical in terms of cycle performance, safety, and volume change during cycling. Herein, the role of pore size distribution in the Li metal plating behavior of porous frameworks is clarified to attain the ideal pore structure of the framework as a Li metal host. The monodisperse pore framework shows the conformal electrodeposition of the Li metal, whereas the pore size gradient framework exhibits the superconformal plating of the Li metal. The conformal and superconformal electrodepositions of the Li metal are elucidated in terms of variations along the pore depth direction in the charge-transfer resistance on the pore walls and the ionic resistance of electrolytes confined in pores. The pore size gradient framework also shows excellent electrochemical performance, such as stable capacity retention over 760 cycles with 0.5 mAh cm-2 at 2 mA cm-2. These findings provide fundamental insights into strategies to improve the electrochemical performance of porous frameworks for Li metal batteries. © 2021 American Chemical Society.
American Chemical Society
Related Researcher
  • Author Lee, Jong-Won Laboratory for Electrochemical Energy Materials and Interfaces
  • Research Interests 이차전지, 연료전지, 재료전기화학, 나노에너지소재
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Department of Energy Science and EngineeringLaboratory for Electrochemical Energy Materials and Interfaces1. Journal Articles

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