Unravelling the Role of Electrochemically Active FePO4 Coating by Atomic Layer Deposition for Increased High-Voltage Stability of LiNi0.5Mn1.5O4 Cathode Material

Biwei Xiao; Jian Liu; Qian Sun; Biqiong Wang; Mohammad Norouzi Banis; Dong Zhao; Zhiqiang Wang; Ruying Li; Xiaoyu Cui; Tsun-Kong Sham; Xueliang Sun

doi:10.1002/advs.201500022

Unravelling the Role of Electrochemically Active FePO₄ Coating by Atomic Layer Deposition for Increased High-Voltage Stability of LiNi_0.5Mn_1.5O₄ Cathode Material

Adv Sci (Weinh). 2015 Mar 25;2(5):1500022. doi: 10.1002/advs.201500022. eCollection 2015 May.

Authors

Affiliations

¹ Department of Mechanical and Materials Engineering University of Western Ontario London ON Canada N6A 5B9.
² Department of Mechanical and Materials Engineering University of Western Ontario London ON Canada N6A 5B9; Department of Chemistry University of Western Ontario London ON Canada N6A 5B7.
³ Department of Chemistry University of Western Ontario London ON Canada N6A 5B7.
⁴ Canadian Light Source Saskatoon SK Canada S7N 2V3.

Abstract

Ultrathin amorphous FePO₄ coating derived by atomic layer deposition (ALD) is used to coat the 5 V LiNi_0.5Mn_1.5O₄ cathode material powders, which dramatically increases the capacity retention of LiNi_0.5Mn_1.5O₄. It is believed that the amorphous FePO₄ layer could act as a lithium-ions reservoir and electrochemically active buffer layer during the charge/discharge cycling, helping achieve high capacities in LiNi_0.5Mn_1.5O₄, especially at high current densities.

Keywords: X‐ray absorption spectroscopy; atomic layer deposition; iron phosphate; lithium nickel manganese oxide; lithium‐ion batteries.