A Chemical Approach to Raise Cell Voltage and Suppress Phase Transition in O3 Sodium Layered Oxide Electrodes,Advanced Energy Materials

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A Chemical Approach to Raise Cell Voltage and Suppress Phase Transition in O3 Sodium Layered Oxide Electrodes
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-01-11 , DOI: 10.1002/aenm.201702599
Mariyappan Sathiya ₁ , Quentin Jacquet _{1,

2,

3} , Marie-Liesse Doublet ₄ , Olesia M. Karakulina ₅ , Joke Hadermann ₅ , Jean-Marie Tarascon _{1,

2,

3}

Affiliation

Sodium ion batteries (NIBs) are one of the versatile technologies for low‐cost rechargeable batteries. O3‐type layered sodium transition metal oxides (NaMO₂, M = transition metal ions) are one of the most promising positive electrode materials considering their capacity. However, the use of O3 phases is limited due to their low redox voltage and associated multiple phase transitions which are detrimental for long cycling. Herein, a simple strategy is proposed to successfully combat these issues. It consists of the introduction of a larger, nontransition metal ion Sn⁴⁺ in NaMO₂ to prepare a series of NaNi_0.5Mn_0.5− _y Sn _y O₂ (y = 0–0.5) compositions with attractive electrochemical performances, namely for y = 0.5, which shows a single‐phase transition from O3 ⇔ P3 at the very end of the oxidation process. Na‐ion NaNi_0.5Sn_0.5O₂/C coin cells are shown to deliver an average cell voltage of 3.1 V with an excellent capacity retention as compared to an average stepwise voltage of ≈2.8 V and limited capacity retention for the pure NaNi_0.5Mn_0.5O₂ phase_. This study potentially shows the way to manipulate the O3 NaMO₂ for facilitating their practical use in NIBs.

中文翻译：

一种提高O3钠层氧化物电极中电池电压并抑制相变的化学方法

钠离子电池（NIB）是低成本可充电电池的多功能技术之一。考虑到其容量，O3型层状钠过渡金属氧化物（NaMO ₂，M =过渡金属离子）是最有前途的正极材料之一。但是，O3相的使用受到限制，因为它们的氧化还原电压低，并且相关的多个相变对长循环不利。本文中，提出了一种成功应对这些问题的简单策略。它包括在NaMO _2中引入较大的非过渡金属离子Sn ⁴⁺，以制备一系列NaNi _0.5 Mn _0.5-_y Sn _y O ₂（y = 0–0.5）具有吸引人的电化学性能的组合物，即y = 0.5，这表明在氧化过程的最后，O3⇔P3发生了单相转变。Na‐ion NaNi _0.5 Sn _0.5 O ₂ / C纽扣电池的平均电池电压为3.1 V，具有出色的容量保持能力，而平均步进电压为≈2.8V，而纯NaNi _0.5 Mn的容量保持能力有限_0.5 O ₂相_。这项研究潜在地显示了操作O3 NaMO ₂的方法，以促进它们在NIB中的实际使用。

更新日期：2018-01-11

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