Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 168, Issue 6, Pages -Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac0b28
Keywords
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Funding
- LG Energy Solution
- National Research Foundation of Korea [4120200513611] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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High nickel layered oxide LiNi0.8Mn0.1Co0.1O2 (NMC811) coated with a nanometer layer of lithium ion conducting solid electrolyte LiPON using RF-magnetron sputtering shows improved cycling performance and rate capability in all solid-state batteries. Thicker LiPON coatings negatively impact performance due to increased electronic resistance, while the LiPON layer provides interfacial stability and enhances Li+ transport.
High nickel layered oxide LiNi0.8Mn0.1Co0.1O2 (NMC811) was coated with a nanometer layer coating of a lithium ion conducting solid electrolyte, lithium phosphorus oxynitride (LiPON) by using RF-magnetron sputtering. The cells with LiPON coated NMC811 exhibit much improved cycling performance compared to the cells with pristine NMC811 with 64.1% and 42.6% capacity retention respectively over 100 cycles in an all solid-state battery. The LiPON layer provides interfacial stability at high voltages, suppresses the growth of impedance with cycling and improves the rate capability. Thicker coatings show a negative impact on the performance owing to the increase in electronic resistance with increasing thickness of the LiPON layer. The dQ/dV analysis, electrochemical impedance spectroscopy (EIS), and the overpotential study during galvanostatic cycling were conducted to elucidate the improvement of the cycling stability and enhancement of Li+ transport through LiPON layers surrounding NMC811.
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