Harnessing Metastable Byproducts: A Dual-Regulation Strategy for Intrinsically Stable High-Voltage Spinel Cathodes
Source abstract
Abstract
Abstract Spinel LiNi0.5Mn1.5O4 (LNMO) suffers from Mn3+-induced degradation due to thermodynamic phase separation. Herein, we report the preincorporation of a LixNi1–xO (LNO) phase to regulate oxygen behavior through a dual-regulation strategy (interfacial charge modulation and kinetic facilitation of oxygen diffusion). Differential charge and Bader analyses confirm that the presence of LNO increases the covalency of the Mn–O bond and suppresses the release of oxygen. In situ EIS-DRT shows improved interfacial ion transport and suppressed side reactions. The optimized composite finally showed 54.2% less Mn3+, 76.2% higher oxygen vacancy energy, and 98.0% capacity retention over 300 cycles. This work will prove to be an overarching approach to stabilizing metastable cathodes by utilizing deleterious phases.
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Research context
OpenAlex topics: Advancements in Battery Materials · Supercapacitor Materials and Fabrication · Molten salt chemistry and electrochemical processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Tiangong University , , ,
Hubei University of Automotive Technology , , , ,
Wuhan University of Science and Technology , , , ,
Beijing Institute of Technology , , ,
Funding
Ministry of Ecology and Environment, The People?s Republic of China · Natural Science Foundation of Chongqing Municipality · Beijing Institute of Technology · Science and Technology Department of Henan Province · Natural Science Foundation of Beijing Municipality · National Natural Science Foundation of China · Tiangong University · Hubei Key Laboratory of Energy Storage and Power Battery
References (25)
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