%0 Journal Article
%A Ingber, Tjark T. K.
%A Bela, Marlena M.
%A Püttmann, Frederik
%A Dohmann, Jan F.
%A Bieker, Peter
%A Börner, Markus
%A Winter, Martin
%A Stan, Marian
%T Elucidating the lithium deposition behavior in open-porous copper micro-foam negative electrodes for zero-excess lithium metal batteries
%J Journal of materials chemistry / A
%V 11
%N 33
%@ 2050-7488
%C London ˜[u.a.]œ
%I RSC
%M FZJ-2023-04231
%P 17828 - 17840
%D 2023
%Z Unterstützt durch BMBF Grants: MEET Hi-EnD III” (03XP0258A), “ProLiFest” (03XP0253A) und “AMaLiS” (03XP0125D)
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001047520300001
%R 10.1039/D3TA04060G
%U https://juser.fz-juelich.de/record/1017615