Back to Search
Start Over
Revealing Principles for Design of Lean-Electrolyte Lithium Metal Anode via In Situ Spectroscopy
- Source :
- Journal of the American Chemical Society. 142(4)
- Publication Year :
- 2020
-
Abstract
- Lean-electrolyte conditions are highly pursued for practical lithium (Li) metal batteries. The previous studies on the Li metal anodes, in general, exhibited good stability with a large excess of electrolyte. However, the targeted design of Li hosts under relatively low electrolyte conditions has been rarely studied so far. Herein, we have shown that electrolyte consumption severely affects the cycling stability of Li metal anode. Considering carbon hosts as typical examples, we innovatively employed in situ synchrotron X-ray diffraction, in situ Raman spectroscopy, and theoretical computations to obtain a better understanding of the Li nucleation/deposition processes. We also showed the usefulness of in situ electrochemical impedance spectra to analyze interfacial fluctuation at the Li/electrolyte interface, together with nuclear magnetic resonance data to quantify electrolyte consumption. We have found that uneven Li nucleation/deposition and the crack of surface-area-derived solid-electrolyte interface (SEI) layer both lead to a great consumption of electrolyte. Then, we suggested a design principle for Li host to overcome the electrolyte loss, that is, uneven growth of the Li structure and the crack of the SEI layer must be simultaneously controlled. As a proof of concept, we demonstrated the usefulness of a 3D low-surface-area defective graphene host (L-DG) to control Li nucleation/deposition and stabilize the SEI layer, contributing to a highly reversible Li plating/stripping. As a result, such a Li host can achieve stable cycles (e.g., 1.0 mAh cm
- Subjects :
- Nucleation
chemistry.chemical_element
General Chemistry
Electrolyte
In situ spectroscopy
010402 general chemistry
7. Clean energy
01 natural sciences
Biochemistry
Catalysis
0104 chemical sciences
Anode
Metal
Colloid and Surface Chemistry
chemistry
Chemical engineering
visual_art
Electrode
visual_art.visual_art_medium
Lithium
Lithium metal
Subjects
Details
- ISSN :
- 15205126
- Volume :
- 142
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Journal of the American Chemical Society
- Accession number :
- edsair.doi.dedup.....1483ed0f6492cefefa2441922cf214c6