Crystal-structure-matched FePO4 Surface-coating on LiCoPO4/MWCNT Nanocomposites for Long Lifecycle 5 V Class Lithium Ion Batteries

Naohisa OKITA; Etsuro IWAMA; Yusuke TAKAMI; Shingo ABO; Wako NAOI; McMahon Thomas Homer REID; Katsuhiko NAOI

doi:10.5796/electrochemistry.18-00096

This article has now been updated. Please use the final version.

Crystal-structure-matched FePO₄ Surface-coating on LiCoPO₄/MWCNT Nanocomposites for Long Lifecycle 5 V Class Lithium Ion Batteries

Naohisa OKITA, Etsuro IWAMA , Yusuke TAKAMI, Shingo ABO, Wako NAOI, McMahon Thomas Homer REID, Katsuhiko NAOI

Author information

Naohisa OKITA
Department of Applied Chemistry, Tokyo University of Agriculture & Technology
Etsuro IWAMA Corresponding author
Department of Applied Chemistry, Tokyo University of Agriculture & Technology
Global Innovation Research Organization, Tokyo University of Agriculture & Technology
Yusuke TAKAMI
Department of Applied Chemistry, Tokyo University of Agriculture & Technology
Shingo ABO
Department of Applied Chemistry, Tokyo University of Agriculture & Technology
Wako NAOI
Division of Art and Innovative Technologies, K & W Inc.
McMahon Thomas Homer REID
Global Innovation Research Organization, Tokyo University of Agriculture & Technology
Advanced Capacitor Research Center, Tokyo University of Agriculture & Technology
Simpetus LLC.
Katsuhiko NAOI
Department of Applied Chemistry, Tokyo University of Agriculture & Technology
Global Innovation Research Organization, Tokyo University of Agriculture & Technology
Advanced Capacitor Research Center, Tokyo University of Agriculture & Technology

Keywords: Lithium Ion Batteries, High-Voltage Cathode, Lithium Cobalt Phosphate, Iron Phosphate Surface Coating

JOURNAL OPEN ACCESS Advance online publication
Supplementary material

Article ID: 18-00096

DOI https://doi.org/10.5796/electrochemistry.18-00096

The final version of this article is now available: Vol. 87 (2019), No. 3 pp. 156-161

Details

Abstract

Stable high-voltage operation of LiCoPO₄ (LCP) was successfully achieved via crystal-structure-matched surface coating using FePO₄ (FP) with an identical olivine structure to the LCP. The efficient formation of Fe³⁺-rich surface together with the partial dissolution of Fe³⁺ into LCP matrix yielded the excellent cycle performance with 99% of capacity retention at 100^th cycle, with a minimized Fe³⁺ dosage compared to the methods previously reported. This work confirms that the existence of the Fe³⁺ on the LCP surface is an important factor to bring about the stability of electrode/electrolyte interface.

Corresponding author

Register with J-STAGE for free!