High-energy O3-Na1−2xCax[Ni0.5Mn0.5]O2 cathodes for long-life sodium-ion batteries,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

High-energy O3-Na1−2xCax[Ni0.5Mn0.5]O2 cathodes for long-life sodium-ion batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-22 , DOI: 10.1039/d0ta04847j
Tae-Yeon Yu _{1,

2,

3,

4} , Jongsoon Kim _{4,

5,

6,

7} , Jang-Yeon Hwang _{4,

8,

9,

10} , Hyungsub Kim _{4,

11,

12} , Geumjae Han _{1,

2,

3,

4} , Hun-Gi Jung _{13,

14,

15,

16,

17} , Yang-Kook Sun _{1,

2,

3,

4}

Affiliation

Department of Energy Engineering
Hanyang University
Seoul 04763
Republic of Korea
Department of Nanotechnology and Advanced Materials Engineering
Sejong University
Seoul 05006
Department of Materials Science and Engineering
Chonnam National University
Gwangju 61186
Korea Atomic Energy Research Institute
Daejeon 34507
Center for Energy Storage Research
Green City Technology Institute
Korea Institute of Science and Technology
Seoul 02792
South Korea

To facilitate the practical realization of sodium-ion batteries, the energy density, determined by the output operating voltage and/or capacity, needs to be improved to the level of commercial Li-ion batteries. Herein, O3-type Na_0.98Ca_0.01[Ni_0.5Mn_0.5]O₂ is synthesized by incorporating Ca²⁺ into the NaO₆ octahedron of Na[Ni_0.5Mn_0.5]O₂ and its potential use as a cathode material for high energy density SIBs is demonstrated. The ionic radius of calcium (≈1.00 Å) is similar to that of sodium (≈1.02 Å); hence, it is energetically favorable for calcium to occupy sites in the sodium layers. Within a wide operating voltage range of 2.0–4.3 V, O3-type Na_0.98Ca_0.01[Ni_0.5Mn_0.5]O₂ exhibits a reversible O3–P3–O3 phase transition with small volume changes compared to Ca-free Na[Ni_0.5Mn_0.5]O₂ because of the strong interaction between Ca²⁺ and O²⁻ and delivers a high reversible capacity of 209 mA h g⁻¹ at 15 mA g⁻¹ with improved cycling stability. Moreover, Ca substitution improves the practically useful aspects such as thermal and air stability. A prototype pouch full cell with a hard carbon anode shows an excellent capacity retention of 67% over 300 cycles. Thus, this study provides an efficient and simple method to boost the performance and applicability of layered oxide cathode materials for practical applications.

中文翻译：

长寿命钠离子电池用高能O3-Na1-2xCax [Ni0.5Mn0.5] O2阴极

为了促进钠离子电池的实际实现，需要将由输出工作电压和/或容量确定的能量密度提高到商用锂离子电池的水平。这里，O3型的Na _0.98的Ca _0.01 [镍_0.5锰_0.5 ] O ₂是通过将合成的Ca ²⁺进入的NaO ₆的Na [镍的八面体_0.5的Mn _0.5 ] O ₂并证明了其作为高能量密度SIBs阴极材料的潜在用途。钙的离子半径（≈1.00Å）与钠的离子半径（≈1.02Å）相似；因此，钙在钠层中占据位置在能量上是有利的。在2.0-4.3 V的宽工作电压范围内，与无钙Na [Ni _0.5相比，O3型Na _0.98 Ca _0.01 [Ni _0.5 Mn _0.5 ] O ₂具有可逆的O3-P3-O3相变，并且体积变化小。Mn _0.5 ] O _2，因为Ca ²⁺和O ²⁻之间有很强的相互作用，并具有209 mA hg ^-1的高可逆容量在15 mA g ^-1下具有改善的循环稳定性。而且，Ca替代改善了实际有用的方面，例如热稳定性和空气稳定性。具有硬碳阳极的原型袋装满电池在300个循环中显示出67％的出色容量保持率。因此，这项研究提供了一种有效而简单的方法来提高层状氧化物阴极材料在实际应用中的性能和适用性。

更新日期：2020-07-14

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11