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Interface and Defect Engineered Titanium-Base Oxide Heterostructures Synchronizing High-Rate and Ultrastable Sodium Storage
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-08-25 , DOI: 10.1002/aenm.202201531 Weijia Meng 1 , Zhenzhen Dang 1 , Diansen Li 1, 2 , Lei Jiang 1 , Daining Fang 3
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-08-25 , DOI: 10.1002/aenm.202201531 Weijia Meng 1 , Zhenzhen Dang 1 , Diansen Li 1, 2 , Lei Jiang 1 , Daining Fang 3
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Sodium-ion batteries are a promising large-scale electrochemical energy storage system because of their excellent cost advantage compared with lithium-ion batteries. However, the lack of high safety, low cost, and long service life anode materials hinder its actual development. Here, a sodium titanate/titanium dioxide/C (C-NTC) heterostructure composite is reported with oxygen vacancies (OVs) that delivers a high specific capacity of 92.6 mAh g-1 at 5 A g-1 after 35 000 cycles (100% capacity retention) and excellent rate performance of 54 mAh g-1 at 20 A g-1 when tested in combination with a Na-metal anode. Moreover, sodium-ion full batteries assembled with C-NTC as the anode and Na3V2(PO4)3@C-BN as the cathode demonstrates a high specific capacity after 5500 cycles. Electrochemical kinetic tests and density functional theory measurements confirm that the synergistic effect of heterostructure and OVs accelerate the ion/electron transfer kinetics, the stable frame structure, and solid electrolyte interphase layer ensuring the long cycle life. Ex-situ X-ray photon spectroscopy reveals that the generation of Ti0 by disproportionation reactions may be responsible for the degradation of Ti-based oxide performance, which provides unique insight and guidance for the design of titanium-based electrodes with ultra-long cycle life.
中文翻译：
界面和缺陷工程钛基氧化物异质结构同步高速和超稳定钠存储
钠离子电池与锂离子电池相比，具有优异的成本优势，是一种很有前途的大规模电化学储能系统。然而，缺乏安全性高、成本低、使用寿命长的负极材料阻碍了其实际发展。在这里，报道了具有氧空位 (OVs) 的钛酸钠/二氧化钛/C (C-NTC) 异质结构复合材料，在 35 000 次循环后（100% ）在 5 A g -1下提供 92.6 mAh g -1的高比容量当与金属钠阳极结合测试时，容量保持率）和 54 mAh g -1在 20 A g -1下的优异倍率性能。此外，以C-NTC为阳极，Na 3 V 2组装的钠离子全电池(PO 4 ) 3 @C-BN 作为阴极，在 5500 次循环后表现出高比容量。电化学动力学测试和密度泛函理论测量证实，异质结构和 OVs 的协同作用加速了离子/电子转移动力学，稳定的框架结构和固体电解质界面层确保了长循环寿命。异位X射线光子光谱表明，歧化反应生成Ti 0可能是导致Ti基氧化物性能下降的原因，这为超长循环钛基电极的设计提供了独特的见解和指导。生活。
更新日期：2022-08-25
中文翻译：
界面和缺陷工程钛基氧化物异质结构同步高速和超稳定钠存储
钠离子电池与锂离子电池相比，具有优异的成本优势，是一种很有前途的大规模电化学储能系统。然而，缺乏安全性高、成本低、使用寿命长的负极材料阻碍了其实际发展。在这里，报道了具有氧空位 (OVs) 的钛酸钠/二氧化钛/C (C-NTC) 异质结构复合材料，在 35 000 次循环后（100% ）在 5 A g -1下提供 92.6 mAh g -1的高比容量当与金属钠阳极结合测试时，容量保持率）和 54 mAh g -1在 20 A g -1下的优异倍率性能。此外，以C-NTC为阳极，Na 3 V 2组装的钠离子全电池(PO 4 ) 3 @C-BN 作为阴极，在 5500 次循环后表现出高比容量。电化学动力学测试和密度泛函理论测量证实，异质结构和 OVs 的协同作用加速了离子/电子转移动力学，稳定的框架结构和固体电解质界面层确保了长循环寿命。异位X射线光子光谱表明，歧化反应生成Ti 0可能是导致Ti基氧化物性能下降的原因，这为超长循环钛基电极的设计提供了独特的见解和指导。生活。
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