Improving the cycling performance of LiCoO2 at 4.53 V via in situ co-doping of Al-Y-Zr

doi:10.19799/j.cnki.2095-4239.2023.0741

Abstract

Abstract:

The LiCoO₂ is a commercially successful lithium-ion battery cathode material; however, its actual capacity falls short of its theoretical capacity (274 mAh/g). Increasing the charging cutoff voltage can boost discharge capacity; however, the instability of LiCoO₂ under high voltage compromises its cycle life. This study aims to introduce an in situ co-doping strategy with Al-Y-Zr to enhance the cycling performance of LiCoO₂ at 4.53 V. The LiCo_(1-_a_-_b_-_c_-_d₎Al _a Zr _b Y _c Mg _d O₂ cathode material was synthesized using a high-temperature solid-phase method by mixing Al-Y-Zr-doped Co₃O₄, Li₂CO₃, and MgO in a specific stoichiometric ratio. The impact of in situ co-doping on high-voltage LiCoO₂'s cycling performance was investigated. X-ray diffraction revealed a hexagonal layered crystal structure before and after doping, whereas scanning electron microscopy confirmed the regulation of crystal particle size by the doping elements. Electrochemical impedance spectroscopy demonstrated that the co-doping of Al-Y and Al-Y-Zr effectively inhibits growth of R_ct value during cycle testing. Test results from coin and pouch cells showed that in situ co-doping substantially improves the cycling performance, with the latter displaying substantial pronounced enhancement. This study contributes to advancing the application of high-voltage lithium cobalt oxide cathodes. In addition, it provides an experimental foundation for research and development in high-specific-energy lithium-ion battery technology.

Key words: Li ion batteries, LiCoO₂, high voltage, co-doping, cyclic performance

CLC Number:

TM 911

Dalin HU, Panli REN, Changming ZHANG, Mingyang YANG, Zhouguang LU. Improving the cycling performance of LiCoO₂ at 4.53 V via in situ co-doping of Al-Y-Zr[J]. Energy Storage Science and Technology, 2024, 13(3): 742-748.

Figures/Tables 10

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References 13

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样品	Al/ppm	Y/ppm	Zr/ppm	D50/μm	BET/(m²/g)
C1	8231	—	—	16.3	0.191
C2	8283	798	—	16.1	0.202
C3	8229	787	785	15.8	0.209

样品	Co/ppm
C1	1030
C2	728
C3	536

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Improving the cycling performance of LiCoO₂ at 4.53 V via in situ co-doping of Al-Y-Zr

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