A high-entropy layered P2-type cathode with high stability for sodium-ion batteries,Sustainable Energy & Fuels

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A high-entropy layered P2-type cathode with high stability for sodium-ion batteries
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2024-02-05 , DOI: 10.1039/d3se01597a
Hongfeng Liu ₁ , Yingshuai Wang ₁ , Xiangyu Ding ₁ , Yusong Wang ₁ , Feng Wu ₁ , Hongcai Gao _{1,

2,

3}

Affiliation

Layered transition metal oxides are the most promising cathode materials for sodium-ion batteries, however, the cycling stability and rate performance of this type of cathode materials are very limited. Herein, a solid-state reaction method is developed to synthesize micrometer-sized bulk crystals of the P2-type cathode of Na_0.85Li_0.12Ni_0.198Be_0.011Mg_0.011Mn_0.66O₂ (denoted as NLNBMMO-5%) via configurational entropy. The high-entropy layered oxide cathode exhibits superior rate capability, delivers a high reversible capacity of 102.6 mA h g⁻¹ at 1C with a capacity retention of 94.2% after 100 cycles, and maintains a capacity of 78.2 mA h g⁻¹ at 5C with a capacity retention of 78.3% after 300 cycles. This new strategy reduces the ratio of Mn³⁺/Mn⁴⁺, which alleviates the Jahn-Teller distortion effect and enhances the structural stability. Moreover, it expands the interlayer spacing that ensures the excellent rate performance of the cathode, as confirmed by the XPS, the Rietveld refinement of the XRD and the GITT measurement. This work demonstrates that the new composition cathode NLNBMMO-5% is promising for rechargeable sodium-ion batteries with a long cycling life and excellent rate performance.

中文翻译：

钠离子电池高稳定性高熵层状P2型正极

层状过渡金属氧化物是最有前途的钠离子电池正极材料，然而，此类正极材料的循环稳定性和倍率性能非常有限。在此，开发了一种固相反应方法，通过构型熵合成Na _0.85 Li _0.12 Ni _0.198 Be _0.011 Mg _0.011 Mn _0.66 O ₂（表示为NLNBMMO-5%） P2型阴极的微米级块状晶体。高熵层状氧化物正极表现出优异的倍率性能，在1C下提供102.6 mA hg ^-1的高可逆容量，100次循环后容量保持率为94.2%，并在5C下保持78.2 mA hg ^-1的容量300次循环后容量保持率为78.3%。^{这种新策略降低了Mn 3+} /Mn ⁴⁺的比率，从而减轻了Jahn-Teller畸变效应并增强了结构稳定性。此外，它扩大了层间距，确保了正极优异的倍率性能，这一点已通过 XPS、XRD 的 Rietveld 精修和 GITT 测量得到证实。这项工作表明，新型复合正极NLNBMMO-5%有望用于可充电钠离子电池，具有长循环寿命和优异的倍率性能。

更新日期：2024-02-05

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