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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

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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)

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.

Suggested Citation

  • So Young Choi & Jong Hun Sung & Fuead Hasan & Sangram Keshari Mohanty & Madhusudana Koratikere Srinivasa & Hyun Deog Yoo, 2025. "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," Energies, MDPI, vol. 18(13), pages 1-15, June.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:13:p:3387-:d:1689079
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