近日，太原理工大学张献明团队报道了通过可逆固溶和阴离子氧化还原化学消除o3型钠层阴极的高压相变和氧损失。该项研究成果发表在2026年3月11日出版的《科学通报》杂志上。

O3型钠层状氧化物因其可观的理论容量和易于规模化生产的特性，已成为实用化钠离子电池的主流正极材料。将截止电压提升至4.0 V以上虽能突破实际容量限制，但会引发严重的结构退化和电化学失活。

研究组提出氧活性与固溶体集成的设计理念，开发出具有4.3 V高电压稳定性的O3-NaNi_0.35Fe_0.2Mg_0.05Mn_0.3Ti_0.1O₂正极材料，其可逆容量高达162.1 mAh g^-1。可逆氧氧化还原反应赋予材料持久的电化学活性，固溶体反应机制则实现近零晶格应变与快速钠离子传输，从而有效抑制了有害的P3→O1相变。与原始NaNi_0.5Mn_0.5O₂相比，改性正极表现出优异的容量保持率（200次循环后76.0%对21.3%）和倍率性能（5C倍率下95.6对39.3 mAh g^-1）。该研究推动实用化O3型钠电池接近其理论容量，并为设计高电压耐受型层状正极提供了指导。

附：英文原文

Title: Eliminating high-voltage phase transitions and oxygen loss in O3-type sodium layered cathodes via reversible solid-solution and anionic-redox chemistry

Author: anonymous

Issue&Volume: 2026/03/11

Abstract: O3-type sodium layered oxides have emerged as leading cathodes for practical sodium-ion batteries owing to their attractive theoretical capacities and facile scalability. Elevating the cut-off voltage above 4.0 V overcomes their practical capacity limitations but triggers severe structural degradation and electrochemical deactivation. In this study, an oxygen-active and solid-solution integrated concept is proposed to design a robust O3-NaNi0.35Fe0.2Mg0.05Mn0.3Ti0.1O2 cathode, which delivers an impressive capacity of 162.1 mAh g–1 at 4.3 V. Reversible oxygen redox endows long-lasting electrochemical activity, while solid-solution reactions enable near-zero lattice strain and fast Na+ transport. As a result, the detrimental P3→O1 phase transition is eliminated. Compared to pristine NaNi0.5Mn0.5O2, the modified cathode exhibits superior capacity retention (76.0% vs. 21.3% after 200 cycles) and excellent rate capability (95.6 vs. 39.3 mAh g–1 at 5 C). This work pushes practical O3-type sodium batteries toward their theoretical capacity and provides guidance for the design of high-voltage-tolerant layered cathodes.

DOI: 10.1016/j.scib.2026.03.021

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927326002537