<br>O3-NaNi0.5Mn0.5O2 在间隙位点的非金属取代诱导产生几乎为零的应变 P2&O3 双相结构作为超稳定的钠离子阴极,Advanced Functional Materials

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O3-NaNi0.5Mn0.5O2 在间隙位点的非金属取代诱导产生几乎为零的应变 P2&O3 双相结构作为超稳定的钠离子阴极
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-06-23 , DOI: 10.1002/adfm.202406771
Lai Yu ₁ , Xiaoyue He ₁ , Bo Peng _{1,

2} , Feng Wang ₁ , Nazir Ahmad ₁ , Yongkuan Shen ₃ , Xinyi Ma ₁ , Zongzhi Tao ₁ , Jiacheng Liang ₁ , Zixuan Jiang ₁ , Zhidan Diao ₃ , Bowen He ₃ , Yuhu Xie ₃ , Bing Qing ₃ , Chao Wang ₃ , Yifei Wang ₃ , Genqiang Zhang ₁

Affiliation

用于钠离子电池的无钴 O3 型 NaNi_0.5Mn_0.5O₂ 正极材料因其高理论容量和丰富的 Na 储层而显示出巨大的前景。然而，有害相变和大体积应变引起的快速容量衰退严重限制了它们的实际应用。在此，通过定制的硼掺杂策略构建 P2&O3 双相结构很好地解决了这一障碍。间隙位置的轻质硼掺杂减少了 P2 和 O3 结构形成能的能隙，从而诱导了高 Na 状态下 P2&O3 双相的形成。此外，由于 P2&O3 的晶格互锁效应，双相结构表现出接近零的体积应变，如原位 X 射线衍射测量所确定的那样。因此，它表现出卓越的可循环性，在 5 C 的高倍率下，在 1000 次循环中容量保持率为 85.2%。更重要的是，软包型全电池器件可以在 0.1 C 下进行 150 次循环，保持 70.8% 的容量。这项工作可以为未来储能器件通过轻元素掺杂设计先进的高钠电极材料提供新的灵感。

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Nonmetal Substitution in Interstitial Site of O3-NaNi0.5Mn0.5O2 Induces the Generation of a Nearly Zero Strain P2&O3 Biphasic Structure as Ultrastable Sodium-Ion Cathode

Co-free O3-type NaNi_0.5Mn_0.5O₂ cathode material for sodium-ion batteries has shown great promise due to its high theoretical capacity and plentiful Na reservoir. However, the rapid capacity recession caused by harmful phase transition and large volume strain severely restricts their practical application. Herein, the obstacle is well addressed by constructing a P2&O3 biphasic structure via a customized boron-doping strategy. The light-weight boron doping in the interstitial position reduces the energy gap of the formation energy of P2 and O3 structure, which induces the formation of P2&O3 biphase in high Na state. In addition, the biphasic structure exhibits near zero volume strain due to the lattice interlocking effect of P2&O3, as identified by in situ X-ray diffraction measurement. As a result, it presents a remarkable cyclability with a capacity retention of 85.2% over 1000 cycles at a high rate of 5 C. More importantly, a pouch-type full-cell device can exhibit a long cycling life with 70.8% capacity retention over 150 cycles at 0.1 C. This work can offer a new inspiration for designing advanced high sodium electrode materials via light element doping for future energy storage devices.

更新日期：2024-06-23

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