Elucidating and Mitigating High‐Voltage Degradation Cascades in Cobalt‐Free LiNiO2 Lithium‐Ion Battery Cathodes
Year: 2021
Type: article
Abstract: LiNiO2 (LNO) is a promising cathode material for next‐generation Li‐ion batteries due to its exceptionally high capacity and cobalt‐free composition that enables more sustainable and ethical large‐scale manufacturing. However, its poor cycle life at high operating voltages over 4.1 V impedes its practical use, thus motivating efforts to elucidate and mitigate LiNiO2 degradation mechanisms at high states of charge. Here, a multiscale exploration of high‐voltage degradation cascades associated with oxygen stacking chemistry in cobalt‐free LiNiO2, is presented. Lattice oxygen loss is found to play a critical role in the local O3–O1 stacking transition at high states of charge, which subsequently leads to Ni‐ion migration and irreversible stacking faults during cycling. This undesirable atomic‐scale structural evolution accelerates microscale electrochemical creep, cracking, and even bending of layers, ultimately resulting in macroscopic mechanical degradation of LNO particles. By employing a graphene‐based hermetic surface coating, oxygen loss is attenuated in LNO at high states of charge, which suppresses the initiation of the degradation cascade and thus substantially improves the high‐voltage capacity retention of LNO. Overall, this study provides mechanistic insight into the high‐voltage degradation of LNO, which will inform ongoing efforts to employ cobalt‐free cathodes in Li‐ion battery technology.
Source: Advanced Materials
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Funders: State of Illinois, National Science Foundation, U.S. Department of Energy, DuPont, Northwestern University, Ministry of Education, National Research Foundation, National Research Foundation of Korea, Office of Science, Office of Energy Efficiency and Renewable Energy, Materials Research Science and Engineering Center, Harvard University, Division of Materials Research, Division of Civil, Mechanical and Manufacturing Innovation, Division of Electrical, Communications and Cyber Systems, Basic Energy Sciences, Office of Energy Efficiency, Argonne National Laboratory
Awards: G102163711, G107546177, G1104325616, G1169090945, G1177885568, G1276186940, G1286251239, G1313983767, G1615959824, G1664757510, SNM: Customized Inkjet Printing of Graphene-Based Real-time Water Sensors, G227997908, G2287611682, G2295483553, G2540632084, G262962599, G2980203569, G3075337988, G336680401, G3454132534, G3589692066, G3954585026, G426311843, G4285583887, G4458565564, G4592572534, MRSEC: Center for Multifunctional Materials, G4887351165, G498139845, SNM: Customized Inkjet Printing of Graphene-Based Real-time Water Sensors, G513797252, G5218300437, FMRG: Manufacturing ADvanced Electronics through Printing Using Bio-based and Locally Identifiable Compounds (MADE-PUBLIC), G5387317844, NNCI: Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource, G6848031779, G6918803902, G7242373225, G7583137537, G801469781, G8230932042, G969889393, G993121649, G993149817
OpenAlex ID: W3209624812