TY - JOUR
AU - Ingber, Tjark T. K.
AU - Bela, Marlena M.
AU - Püttmann, Frederik
AU - Dohmann, Jan F.
AU - Bieker, Peter
AU - Börner, Markus
AU - Winter, Martin
AU - Stan, Marian
TI - Elucidating the lithium deposition behavior in open-porous copper micro-foam negative electrodes for zero-excess lithium metal batteries
JO - Journal of materials chemistry / A
VL - 11
IS - 33
SN - 2050-7488
CY - London [u.a.]
PB - RSC
M1 - FZJ-2023-04231
SP - 17828 - 17840
PY - 2023
N1 - Unterstützt durch BMBF Grants: MEET Hi-EnD III” (03XP0258A), “ProLiFest” (03XP0253A) und “AMaLiS” (03XP0125D)
AB - In zero-excess lithium metal batteries (ZELMBs), also termed “anode-free” LMBs, Li from the positive electrode is electrodeposited onto a bare current collector instead of the Li metal negative electrode commonly used in LMBs. This enables high theoretical energy density and facile, safe, and low-cost assembly. To tackle coulombic inefficiencies during Li deposition/dissolution, 3D structured current collectors can be used instead of 2D foil materials. This study elucidates the Li deposition behavior in custom-made open-porous Cu micro-foams from nucleation to large scale deposition. For the first time in ZELMBs, surface and sub-surface Li deposits in open-porous 3D materials are compared to deposits on 2D foils using cryogenic focused ion beam scanning electron microscopy (cryo-FIB-SEM). The results highlight that Cu micro-foams can store substantial amounts of dendrite-free Li in their open-porous 3D structure, minimizing detrimental volume changes during Li deposition/dissolution. Electrochemical analyses and simulations reveal that current density distribution over the large surface area of the Cu micro-foams reduces the Li nucleation overvoltage by ≈40%. Also, charge/discharge cycling in ZELMBs shows increases in coulombic efficiency, capacity retention, and cycle life. Overall, this work explains how open-porous Cu micro-foam current collectors improve the Li deposition behavior to boost the cycling characteristics of ZELMBs.
LB - PUB:(DE-HGF)16
UR - <Go to ISI:>//WOS:001047520300001
DO - DOI:10.1039/D3TA04060G
UR - https://juser.fz-juelich.de/record/1017615
ER -