Synthesis and Electrochemical Properties of the Li 3 PO 4 -Coated LiNi 0.5 Mn 1.5 O 4 Cathode Materials for High-Voltage Lithium-Ion Batteries

So Young Choi, Jong Hun Sung, Fuead Hasan, Sangram Keshari Mohanty, Madhusudana Koratikere Srinivasa and Hyun Deog Yoo ()
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So Young Choi: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
Jong Hun Sung: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
Fuead Hasan: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
Sangram Keshari Mohanty: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
Madhusudana Koratikere Srinivasa: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
Hyun Deog Yoo: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea

Energies, 2025, vol. 18, issue 13, 1-15

Abstract: High-voltage spinel (LiNi 0.5 Mn 1.5 O 4 ; LNMO) has been a prospective cathode material that may exploit the maximal voltage of 5 V for lithium-ion batteries. However, the practical application has been hindered by the severe electrochemical instability of the Ni 2+ /Ni 4+ redox couple at such a high voltage. Herein, we coated lithium phosphate (Li 3 PO 4 ) on the surface of the LNMO by a wet-coating method to improve the electrochemical stability. The coating layer provided an effective cathode–electrolyte interphase, which prevented the excessive decomposition of the electrolyte on the surface of LNMO cathode. The Li 3 PO 4 -coated LNMO exhibited enhanced rate capability in accordance with the lowered solid-electrolyte interphase (SEI) and charge-transfer resistance values from electrochemical impedance spectroscopy.

Keywords: high-voltage spinel cathode; Li-ion battery; lithium phosphate coating (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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