Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.electacta.2021.137831
Title: Key design considerations for synthesis of mesoporous alpha-Li3V2(PO4)(3)/C for high power lithium batteries
Authors: Lee, Hwang Sheng
Ramar, Vishwanathan
Kuppan, Saravanan 
Nagarathinam, Mangayarkarasi
Law, Markas
Wang, Chen
Tripathi, Abhinav
Balaya, Palani
Keywords: Science & Technology
Physical Sciences
Electrochemistry
Lithium storage
Lithium vanadium phosphate
Cathode material
Mesoporous morphology
High rate
Electron diffusion length
Issue Date: 10-Mar-2021
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Citation: Lee, Hwang Sheng, Ramar, Vishwanathan, Kuppan, Saravanan, Nagarathinam, Mangayarkarasi, Law, Markas, Wang, Chen, Tripathi, Abhinav, Balaya, Palani (2021-03-10). Key design considerations for synthesis of mesoporous alpha-Li3V2(PO4)(3)/C for high power lithium batteries. ELECTROCHIMICA ACTA 372. ScholarBank@NUS Repository. https://doi.org/10.1016/j.electacta.2021.137831
Abstract: In this article, we propose key design criteria to synthesis carbon coated α-Li3V2(PO4)3 positive electrode material for high power lithium batteries. A facile and scalable one-pot soft template method is adopted to synthesize α-Li3V2(PO4)3/C (LVP/C), which exhibits unique morphology of micron-size mesoporous secondary particles comprising interconnected primary nanoparticles showing good storage and rate performances with long cycle life. This cathode material displays high discharge capacities of 178, 90 and 59 mAh.g−1 at 0.1C, 30C and 80C, respectively. The mesoporous LVP/C with a 3D lithium diffusion network exhibits better rate performance (90 mAh.g−1 at 30C) as compared to the known phosphate, silicate or oxide cathode materials for lithium-ion batteries (LIBs). In addition, LVP/C electrode material retains 80% (at 1C) and 100% (at 20C) of its initial capacity after 1,000 cycles. The phase transitions during delitiation/litiation are discussed at different cutoff voltages, corresponding to the number of moles of lithium involved in the redox reactions. The reversibility of electrochemical extraction/insertion processes are confirmed using operando XRD measurements. Observed storage performances can be attributed not only to high crystallinity of LVP/C calcined at 800°C for 6 h; also to the unique mesoporous architecture of this carbon coated cathode material forming high packing density during the soft template synthesis. Obtained dense packed mesoporous architecture of LVP/C allows favourable (i) electrolyte wettability for lithium-incorporation from the electrolyte and (ii) long electronic wiring by the well-connected carbon coating towards the current collector.
Source Title: ELECTROCHIMICA ACTA
URI: https://scholarbank.nus.edu.sg/handle/10635/193934
ISSN: 00134686
18733859
DOI: 10.1016/j.electacta.2021.137831
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