Enhanced Rate Capability and Cycle Performance of Titanium-Substituted P2-Type Na0.67Fe0.5Mn0.5O2 as a Cathode for Sodium-Ion Batteries,ACS Omega

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Enhanced Rate Capability and Cycle Performance of Titanium-Substituted P2-Type Na0.67Fe0.5Mn0.5O2 as a Cathode for Sodium-Ion Batteries
ACS Omega ( IF 3.7 ) Pub Date : 2018-01-11 00:00:00 , DOI: 10.1021/acsomega.7b01481
Joon-ki Park ₁ , Geun-gyung Park ₁ , Hunho H. Kwak ₂ , Seung-Tae Hong ₂ , Jae-won Lee ₁

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In this study, we developed a doping technology capable of improving the electrochemical performance, including the rate capability and cycling stability, of P2-type Na_0.67Fe_0.5Mn_0.5O₂ as a cathode material for sodium-ion batteries. Our approach involved using titanium as a doping element to partly substitute either Fe or Mn in Na_0.67Fe_0.5Mn_0.5O₂. The Ti-substituted Na_0.67Fe_0.5Mn_0.5O₂ shows superior electrochemical properties compared to the pristine sample. We investigated the changes in the crystal structure, surface chemistry, and particle morphology caused by Ti doping and correlated these changes to the improved performance. The enhanced rate capability and cycling stability were attributed to the enlargement of the NaO₂ slab in the crystal structure because of Ti doping. This promoted Na-ion diffusion and prevented the phase transition from the P2 to the OP4/″Z″ structure.

中文翻译：

钛合金替代P2-型Na _0.67 Fe _0.5 Mn _0.5 O ₂的钠离子电池的倍率性能和循环性能

在这项研究中，我们开发了一种掺杂技术，能够改善P2型Na _0.67 Fe _0.5 Mn _0.5 O ₂作为钠离子电池正极材料的电化学性能，包括速率性能和循环稳定性。我们的方法涉及使用钛作为掺杂元素部分替代Na _0.67 Fe _0.5 Mn _0.5 O _2中的Fe或Mn 。Ti取代的Na _0.67 Fe _0.5 Mn _0.5 O ₂与原始样品相比，具有更好的电化学性能。我们研究了钛掺杂引起的晶体结构，表面化学性质和颗粒形态的变化，并将这些变化与改善的性能相关联。速率能力和循环稳定性的提高归因于由于Ti掺杂而使NaO ₂平板的晶体结构变大。这促进了钠离子的扩散，并阻止了从P2到OP4 /“ Z”结构的相变。

更新日期：2018-01-11

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