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Electrochemical Performance of Carbon Modified LiNiPO: as Li-Ion Battery Cathode: A Combined Experimental and Theoretical Study

Nasir, Mehwish Huma; Janjua, Naveed Kauser; Santoki, Jay

Abstract:
This study demonstrates the synthesis of olivine LiNiPO4and carbon modified LiNiPO4(LNP/C-composites) cathode materials foruse in lithium-ion batteries (LIBs) synthesized via non aqueous sol-gel process. The LNP/C-composites were fabricated throughhigh energy ball-milling of LiNiPO4with different weight ratios of conductive carbon black. The electrochemical performance ofLiNiPO4has been considerably improved by modifying the material with conductive carbon black which enhanced cathodeperformance as thoroughly studied by electrochemical analysis. Discharge capacities of LNP/C-composite cathodes with 25 wt%carbon were 175 mAh g−1, 150 mAh g−1and 125 mAh g−1with corresponding capacity retention of 82.7%, 84.1% and 82.2%after 100 cycles at 0.05C, 0.1C and 1C rates, respectively. High-temperature electrochemical impedance spectra correspond todecreased charge transfer resistance with increased electronic conductivity and minimum cell polarization for the LNP/C powders.Additionally, the inflow of lithium-ionflux in cathode particle was simulated by using phase-field modeling indicating thecoexistence of Li-poor and Li-rich phases during charging and discharging processes. ... mehr



Originalveröffentlichung
DOI: 10.1149/1945-7111/abb83d
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1945-7111
KITopen-ID: 1000124165
Erschienen in Journal of the Electrochemical Society
Band 167
Heft 13
Seiten 130526
Vorab online veröffentlicht am 30.09.2020
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