skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Cathode-Electrolyte Interphase in Lithium Batteries Revealed by Cryogenic Electron Microscopy

Journal Article · · Matter (Online)

Cathode electrolyte interphase (CEI), the intimate coating layer formed on the positive electrode, has been thought to be critical. However, many aspects of CEI remain unclear. This originates from the lack of effective tools to characterize structural and chemical properties of these sensitive interphases at nanoscale. Here, we develop a protocol to preserve the native state and directly visualize the interface on the positive electrode using cryogenic electron microscopy. We find that under normal operation conditions, there does not exist an intimate coating layer at the single-particle level in carbonate-based electrolyte. However, upon brief external electrical shorting, a solid-electrolyte interphase, which usually forms on anodes, could form on cathodes and be electrochemically converted into a stable, conformal CEI in situ. The conformal CEI helps improve Coulombic efficiency and overall capacity retention of the battery. This generates a different perspective of CEI in commercial carbonate-based electrolytes than previously understood.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515; ECCS-2026822
OSTI ID:
1708934
Alternate ID(s):
OSTI ID: 1768244
Journal Information:
Matter (Online), Journal Name: Matter (Online) Vol. 4 Journal Issue: 1; ISSN 2590-2385
Publisher:
Cell Press/ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (36)

Cryo-STEM mapping of solid–liquid interfaces and dendrites in lithium-metal batteries journal August 2018
Correlating Structure and Function of Battery Interphases at Atomic Resolution Using Cryoelectron Microscopy journal October 2018
Examining Solid Electrolyte Interphase Formation on Crystalline Silicon Electrodes: Influence of Electrochemical Preparation and Ambient Exposure Conditions journal September 2012
Phosphorus Enrichment as a New Composition in the Solid Electrolyte Interphase of High-Voltage Cathodes and Its Effects on Battery Cycling journal October 2015
Electrode/Electrolyte Interface Reactivity in High-Voltage Spinel LiMn 1.6 Ni 0.4 O 4 /Li 4 Ti 5 O 12 Lithium-Ion Battery journal May 2010
Study of the Cathode–Electrolyte Interface of LiMn[sub 1.5]Ni[sub 0.5]O[sub 4] Synthesized by a Sol–Gel Method for Li-Ion Batteries journal January 2010
Dynamic evolution of cathode electrolyte interphase (CEI) on high voltage LiCoO2 cathode and its interaction with Li anode journal September 2018
Evolution of the LiFePO4 positive electrode interface along cycling monitored by MAS NMR journal February 2013
Mechanisms of Degradation and Strategies for the Stabilization of Cathode–Electrolyte Interfaces in Li-Ion Batteries journal January 2018
Chemical and Structural Stability of Lithium-Ion Battery Electrode Materials under Electron Beam journal July 2014
Investigations on the Fundamental Process of Cathode Electrolyte Interphase Formation and Evolution of High-Voltage Cathodes journal December 2019
Sulphur–TiO2 yolk–shell nanoarchitecture with internal void space for long-cycle lithium–sulphur batteries journal January 2013
Dynamic Behavior at the Interface between Lithium Cobalt Oxide and an Organic Electrolyte Monitored by Neutron Reflectivity Measurements journal September 2016
Cathode Modification for Improved Performance of Rechargeable Lithium∕Composite Polymer Electrolyte-Pyrite Battery journal January 1999
Dynamic Structure and Chemistry of the Silicon Solid-Electrolyte Interphase Visualized by Cryogenic Electron Microscopy journal November 2019
Review of selected electrode–solution interactions which determine the performance of Li and Li ion batteries journal August 2000
Theory of SEI Formation in Rechargeable Batteries: Capacity Fade, Accelerated Aging and Lifetime Prediction journal December 2012
Anode-originated SEI migration contributes to formation of cathode-electrolyte interphase layer journal January 2018
Film Formation at Positive Electrodes in Lithium-Ion Batteries journal January 2005
In Situ Visualized Cathode Electrolyte Interphase on LiCoO 2 in High Voltage Cycling journal May 2017
High-Concentration Ether Electrolytes for Stable High-Voltage Lithium Metal Batteries journal March 2019
Operando Investigation into Dynamic Evolution of Cathode–Electrolyte Interfaces in a Li-Ion Battery journal February 2019
Conversion Reaction Mechanisms in Lithium Ion Batteries: Study of the Binary Metal Fluoride Electrodes journal November 2011
Chemical versus Electrochemical Electrolyte Oxidation on NMC111, NMC622, NMC811, LNMO, and Conductive Carbon journal September 2017
Capacity Fade Mechanisms and Side Reactions in Lithium-Ion Batteries journal January 1998
New Insights on the Structure of Electrochemically Deposited Lithium Metal and Its Solid Electrolyte Interphases via Cryogenic TEM journal November 2017
Aging of the LiNi[sub 1∕2]Mn[sub 1∕2]O[sub 2] Positive Electrode Interface in Electrolyte journal January 2009
Electrolytes and Interphases in Li-Ion Batteries and Beyond journal October 2014
Atomic structure of sensitive battery materials and interfaces revealed by cryo–electron microscopy journal October 2017
Review on electrode–electrolyte solution interactions, related to cathode materials for Li-ion batteries journal March 2007
Stable cycling of high-voltage lithium metal batteries in ether electrolytes journal July 2018
Extending the Service Life of High-Ni Layered Oxides by Tuning the Electrode-Electrolyte Interphase journal September 2018
Ethylene Sulfite as Electrolyte Additive for Lithium-Ion Cells with Graphitic Anodes journal January 1999
Review—SEI: Past, Present and Future journal January 2017
The Electrochemical Behavior of Alkali and Alkaline Earth Metals in Nonaqueous Battery Systems—The Solid Electrolyte Interphase Model journal January 1979
Evolution of the Solid–Electrolyte Interphase on Carbonaceous Anodes Visualized by Atomic-Resolution Cryogenic Electron Microscopy journal July 2019