Utilizing the Intrinsic Thermal Instability of Swedenborgite Structured YBaCoO as an Opportunity for Material Engineering in Lithium-Ion Batteries by Er and Ga Co-Doping Processes. | LitMetric
Department of Energy & Mineral Resources Engineering, Sejong University, Seoul 05006, Korea.
Published: August 2021
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Article Abstract
We firstly introduce Er and Ga co-doped swedenborgite-structured YBaCoO (YBC) as a cathode-active material in lithium-ion batteries (LIBs), aiming at converting the phase instability of YBC at high temperatures into a strategic way of enhancing the structural stability of layered cathode-active materials. Our recent publication reported that YErBaCoGaO (YEBCG) showed excellent phase stability compared to YBC in a fuel cell operating condition. By contrast, the feasibility of the LiCoO (LCO) phase, which is derived from swedenborgite-structured YBC-based materials, as a LIB cathode-active material is investigated and the effects of co-doping with the Er and Ga ions on the structural and electrochemical properties of Li-intercalated YBC are systemically studied. The intrinsic swedenborgite structure of YBC-based materials with tetrahedrally coordinated Co/Co are partially transformed into octahedrally coordinated Co, resulting in the formation of an LCO layered structure with a space group of that can work as a Li-ion migration path. Li-intercalated YEBCG (Li[YEBCG]) shows effective suppression of structural phase transition during cycling, leading to the enhancement of LIB performance in Coulombic efficiency, capacity retention, and rate capability. The galvanostatic intermittent titration technique, cyclic voltammetry and electrochemical impedance spectroscopy are performed to elucidate the enhanced phase stability of Li[YEBCG].
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Key Laboratory of Advanced Energy Storage and Conversion of Wenzhou, Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China.
Lead oxides (PbO, 1 ≤ ≤ 2) are promising high-capacity and low-cost anodes for lithium ion batteries (LIBs). However, the huge lithiation-induced volume expansion of conventional large-sized PbO particles leads to severe electrode pulverization with poor cycling stability. Herein, a rare mixed-valence PbO with a unique hierarchical architecture of nanoparticle-assembled interconnected hollow spheres (denoted PbO NAHSs) is crafted by introducing polyvinylpyrrolidone (PVP) into the solution of generating β-PbO microspheres (MSs), which is exploited for the first time as a potential advanced anode material for LIBs.
