An electron-deficient carbon current collector for anode-free Li-metal batteries

Hyeokjin Kwon, Ju-Hyuk Lee, Youngil Roh, Jaewon Baek, Dong Jae Shin, Jong Keon Yoon, Hoe Jin Ha, Je Young Kim and Hee-Tak Kim ()
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Hyeokjin Kwon: KAIST
Ju-Hyuk Lee: KAIST
Youngil Roh: KAIST
Jaewon Baek: KAIST
Dong Jae Shin: KAIST
Jong Keon Yoon: Battery R&D, LG Energy Solution
Hoe Jin Ha: Battery R&D, LG Energy Solution
Je Young Kim: Battery R&D, LG Energy Solution
Hee-Tak Kim: KAIST

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract The long-term cycling of anode-free Li-metal cells (i.e., cells where the negative electrode is in situ formed by electrodeposition on an electronically conductive matrix of lithium sourced from the positive electrode) using a liquid electrolyte is affected by the formation of an inhomogeneous solid electrolyte interphase (SEI) on the current collector and irregular Li deposition. To circumvent these issues, we report an atomically defective carbon current collector where multivacancy defects induce homogeneous SEI formation on the current collector and uniform Li nucleation and growth to obtain a dense Li morphology. Via simulations and experimental measurements and analyses, we demonstrate the beneficial effect of electron deficiency on the Li hosting behavior of the carbon current collector. Furthermore, we report the results of testing anode-free coin cells comprising a multivacancy defective carbon current collector, a LixNi0.8Co0.1Mn0.1-based cathode and a nonaqueous Li-containing electrolyte solution. These cells retain 90% of their initial capacity for over 50 cycles under lean electrolyte conditions.

Date: 2021
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DOI: 10.1038/s41467-021-25848-1

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