Triphase Electrode Performance Adjustment for Rechargeable Ion Batteries
Triphase Electrode Performance Adjustment for Rechargeable Ion Batteries
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可充电离子电池的三相电极性能调整
DOI：
10.1016/j.nanoen.2017.11.006
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发表时间：
2018
期刊：
影响因子：
17.6
通讯作者：
Haijun Yu
中科院分区：
文献类型：
--
作者：
Hao Ma;Heng Su;Khailil Amine;Xinyu Liu;Saddique Jaffer;Tongtong Shang;Lin Gu;Haijun Yu
可充电电池电极主要是结构单一的经典氧化物，但其性能不足以满足现代社会日益增长的储能需求。近年来，复合结构材料的电化学性能得到了很大的改善。然而，很少有人对这些材料进行研究，以调整其结构，并进一步控制其电化学性能。在此，基于原位高温X射线衍射的结果，设计了用于钠离子电池的复合结构Na 2/3 Ni 1/3− xFexTi 2/3 O 2（0 ≤ x ≤ 1/3）电极。制备了P_2-Na_（2/3）Ni_（1/3）Ti_（2/3）O_2、隧道-Na_（2. 65）Ti_（3. 35）Fe_（0. 65）O_9和隧道-NaFeTiO_4三相复合材料，用原位电化学X射线衍射法观察了不同结构中Na ~+的嵌入/脱嵌。当P2结构含量为46%时，电极的综合性能最好：初始可逆容量沿着为105 mAh g− 1，循环1500次后容量保持率为86.5%。这项工作为设计和调整复合电极以获得更好的电化学性能开辟了一个新领域，不仅限于钠离子电池，也适用于其他先进的电池系统。
Rechargeable batteries electrodes are mainly classical oxides with single structure, but their performance is insufficient to meet the growing energy storage needs of modern-society. Recently, composite-structure materials with great improvements in electrochemical performance have been developed. However, little research has been conducted on these materials with regard to adjusting their structures and further controlling their electrochemical performance. Herein, composite-structure Na2/3Ni1/3−xFexTi2/3O2(0 ≤ x ≤ 1/3) electrodes for sodium-ion batteries were designed on the basis of results fromin-situhigh-temperature X-ray diffraction. Triphase compositions of P2-Na2/3Ni1/3Ti2/3O2, tunnel-Na2.65Ti3.35Fe0.65O9, and tunnel-NaFeTiO4were prepared, and Na+insertion/extraction in different structures was observed usingin-situelectrochemical X-ray diffraction. An optimum electrode with 46% P2-structure presented the best comprehensive performance: 105 mAh g−1initial reversible capacity along with 86.5% capacity-retention after 1500 cycles. This work opens a new field for designing and adjusting composite electrodes for better electrochemical performance, not limited for sodium-ion batteries but also for other advanced battery-systems.