Abstract
A series of soaking experiments were conducted to investigate electrolyte decompositions etching on the 5 V cobalt-free spinel LiNi0.5Mn1.5O4 (LNMO) cathode, revealing that intense electrode/electrolyte reactions between LNMO and Gen2 electrolyte could lead to significant corrosion and delamination of electrode laminates.1 In this study, similar soaking tests are performed for 0.3Li2MnO3 ·0.7LiMn0.5Ni0.5O2 (LMR-NM), a promising cathode material for next-generation high-energy-density and cobalt-free lithium-ion batteries, to assess its stability with respect to the electrolyte and its aging byproducts resulting from extended storage at elevated temperature.The acidic electrolyte decomposition generated at 55 oC can result in undesirable transition metal (TM) dissolution, which is considered as a main cause for lithium inventory loss and cells degradation. However, lithium difluoro(oxalato)borate (LiDFOB) can act as a scavenger type additive by reacting with early-stage electrolyte decomposition products, forming a thermal stable salt of lithium tetrafluoro oxalato phosphate (LiF4OxP), and preventing further electrolyte decompositions.2 Additionally, modifications involving Co-doping and Al(NO3)3 surface coating for LMR-NM can also alleviate these electrode/electrolyte interactions. The role of cathode electrolyte interphase (CEI) in mitigating such etching is also examined. Wang, Bingning, et al. "Understanding and Mitigating the Dissolution and Delamination Issues Encountered with High-Voltage LiNi0. 5Mn1. 5O4." Batteries9 (2023): 435.Liu, Minghong, et al. "Improved electrolyte and its application in LiNi1/3Mn1/3Co1/3O2–Graphite full cells." Journal of Power Sources268 (2014): 37-44.
Published Version
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