P2-Type Moisture-Stable and High-Voltage-Tolerable Cathodes for High-Energy and Long-Life Sodium-Ion Batteries

Siqi Yuan, Lei Yu, Guannan Qian, Yingying Xie, Penghui Guo, Guijia Cui, Jun Ma, Xiangyu Ren, Zhixin Xu, Sang-Jun Lee, Jun-Sik Lee, Yijin Liu, Yang Ren, Linsen Li, Guoqiang Tan*, Xiaozhen Liao*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

42 Citations (Scopus)

Abstract

P2-Na0.67Ni0.33Mn0.67O2 represents a promising cathode for Na-ion batteries, but it suffers from severe structural degradation upon storing in a humid atmosphere and cycling at a high cutoff voltage. Here we propose an in situ construction to achieve simultaneous material synthesis and Mg/Sn cosubstitution of Na0.67Ni0.33Mn0.67O2 via one-pot solid-state sintering. The materials exhibit superior structural reversibility and moisture insensitivity. In-operando XRD reveals an essential correlation between cycling stability and phase reversibility, whereas Mg substitution suppressed the P2-O2 phase transition by forming a new Z phase, and Mg/Sn cosubstitution enhanced the P2-Z transition reversibility benefiting from strong Sn-O bonds. DFT calculations disclosed high chemical tolerance to moisture, as the adsorption energy to H2O was lower than that of the pure Na0.67Ni0.33Mn0.67O2. A representative Na0.67Ni0.23Mg0.1Mn0.65Sn0.02O2 cathode exhibits high reversible capacities of 123 mAh g-1 (10 mA g-1), 110 mAh g-1 (200 mA g-1), and 100 mAh g-1 (500 mA g-1) and a high capacity retention of 80% (500 mA g-1, 500 cycles). © 2023 American Chemical Society
Original languageEnglish
Pages (from-to)1743-1751
JournalNano Letters
Volume23
Issue number5
Online published22 Feb 2023
DOIs
Publication statusPublished - 8 Mar 2023

Research Keywords

  • cosubstitution
  • P2-type cathode
  • reversible phase transition
  • sodium-ion batteries
  • solid-state synthesis

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