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

doi:10.1016/j.jechem.2019.09.005

能源化学(英文版) ›› 2020, Vol. 44 ›› Issue (5): 68-72.DOI: 10.1016/j.jechem.2019.09.005

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

Danmiao Kang^a, Kun Tang^a, Joonho Koh^b, Wenbin Liang^a, John P. Lemmon^a

a National Institute of Clean-and-Low-Carbon Energy, Future Science & Technology City, Changping District, Beijing 102209, China;
b NICE America Research, 2091 Stierlin Ct, Mountain View, CA 94043, United States

收稿日期:2019-07-04 修回日期:2019-08-27 出版日期:2020-05-15 发布日期:2020-12-18
基金资助:
We thank Dr. Q. Wang for designing the schematic, H. Pei for SEM characterization and J. Chen for XPS test.

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

Danmiao Kang^a, Kun Tang^a, Joonho Koh^b, Wenbin Liang^a, John P. Lemmon^a

a National Institute of Clean-and-Low-Carbon Energy, Future Science & Technology City, Changping District, Beijing 102209, China;
b NICE America Research, 2091 Stierlin Ct, Mountain View, CA 94043, United States

Received:2019-07-04 Revised:2019-08-27 Online:2020-05-15 Published:2020-12-18
Contact: Danmiao Kang, John P. Lemmon
Supported by:
We thank Dr. Q. Wang for designing the schematic, H. Pei for SEM characterization and J. Chen for XPS test.

摘要/Abstract

摘要： 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

Abstract: 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.

Key words: Li-metal, Carbon interlayer, Dendrite, Charge distribution

Danmiao Kang, Kun Tang, Joonho Koh, Wenbin Liang, John P. Lemmon. Homogenous charge distribution by free-standing porous structure for dendrite-free Li metal anode[J]. 能源化学(英文版), 2020, 44(5): 68-72.

Danmiao Kang, Kun Tang, Joonho Koh, Wenbin Liang, John P. Lemmon. Homogenous charge distribution by free-standing porous structure for dendrite-free Li metal anode[J]. Journal of Energy Chemistry, 2020, 44(5): 68-72.

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

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

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