Understanding Degradation at the Lithium-Ion Battery Cathode/Electrolyte Interface: Connecting Transition-Metal Dissolution Mechanisms to Electrolyte Composition

Overview

Journal ACS Appl Mater Interfaces

Publisher American Chemical Society

Specialties Biomedical Engineering
Biotechnology

Date 2021 Mar 4

PMID 33660970

Citations 8

Authors

Di Huang

Chaiwat Engtrakul

Sanjini Nanayakkara

David W Mulder

Sang-Don Han

Meng Zhou

Hongmei Luo

Robert C Tenent

Affiliations

Soon will be listed here.

Abstract

Lithium transition-metal oxides (LiMnO and LiMO where M = Ni, Mn, Co, ) are widely applied as cathode materials in lithium-ion batteries due to their considerable capacity and energy density. However, multiple processes occurring at the cathode/electrolyte interface lead to overall performance degradation. One key failure mechanism is the dissolution of transition metals from the cathode. This work presents results combining scanning electrochemical microscopy with inductively coupled plasma (ICP) and electron paramagnetic resonance (EPR) spectroscopies to examine cathode degradation products. Our effort employs a LiMnO (LMO) thin film as a model cathode to monitor the Mn dissolution process without the potential complications of conductive additive and polymer binders. We characterize the electrochemical behavior of LMO degradation products in various electrolytes, paired with ICP and EPR, to better understand the properties of Mn complexes formed following metal dissolution. We find that the identity of the lithium salt anions in our electrolyte systems [ClO, PF, and (CFSO)N] appears to affect the Mn dissolution process significantly as well as the electrochemical behavior of the generated Mn complexes. This implies that the mechanism for Mn dissolution is at least partially dependent on the lithium salt anion.

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