Li Dynamics in Mixed Ionic-Electronic Conducting Interlayer of All-Solid-State Li-metal Batteries
- Northeastern Univ., Boston, MA (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Boston College, Chestnut Hill, MA (United States)
- Army Research Lab., Adelphi, MD (United States)
- Rochester Inst. of Technology, Rochester, NY (United States)
Lithium–metal (Li0) anodes potentially enable all-solid-state batteries with high energy density. However, it shows incompatibility with sulfide solid-state electrolytes (SEs). One strategy is introducing an interlayer, generally made of a mixed ionic-electronic conductor (MIEC). Yet, how Li behaves within MIEC remains unknown. Herein, we investigated the Li dynamics in a graphite interlayer, a typical MIEC, by using operando neutron imaging and Raman spectroscopy. This study revealed that intercalation-extrusion-dominated mechanochemical reactions during cell assembly transform the graphite into a Li-graphite interlayer consisting of SE, Li0, and graphite-intercalation compounds. During charging, Li+ preferentially deposited at the Li-graphite|SE interface. Upon further plating, Li0-dendrites formed, inducing short circuits and the reverse migration of Li0. Modeling indicates the interface has the lowest nucleation barrier, governing lithium transport paths. Our study elucidates intricate mechano-chemo-electrochemical processes in mixed conducting interlayers. The behavior of Li+ and Li0 in the interlayer is governed by multiple competing factors.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Northeastern Univ., Boston, MA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- AC05-00OR22725; SC0024528; SC0018675; DMR-2003343
- OSTI ID:
- 2282796
- Alternate ID(s):
- OSTI ID: 2283884; OSTI ID: 2293547
- Journal Information:
- Nano Letters, Vol. 24, Issue 5; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Related Subjects
lithium−metal anode
all-solid-state batteries
mixed ionic-electronic conductor (MIEC)
operando neutron imaging
Raman spectroscopy
mechano-chemo-electrochemical processes
lithium−metal anode
all-solid-state batteries
mixed ionic-electronic conductor (MIEC)
operando neutron imaging
Raman spectroscopy
mechano-chemo-electrochemical processes