当前位置: X-MOL 学术Energy Storage Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A low-strain V3Nb17O50 anode compound for superior Li+ storage
Energy Storage Materials ( IF 18.9 ) Pub Date : 2020-05-28 , DOI: 10.1016/j.ensm.2020.05.012
Qingfeng Fu , Xiangzhen Zhu , Renjie Li , Guisheng Liang , Lijie Luo , Yongjun Chen , Yuanli Ding , Chunfu Lin , Kuikui Wang , Xiu Song Zhao

M–Nb–O compounds are regarded as advanced anode materials of lithium-ion batteries owing to their large capacities, high safety and fast Li+ transport. However, challenges remain in the exploitation of new M–Nb–O compounds with low strains to enable superior cyclability. Here, we exploit V3Nb17O50 as a low-strain M–Nb–O anode compound, and V3Nb17O50 micron-sized particles (V3Nb17O50-MP) and submicron-sized rods (V3Nb17O50-SR) are demonstrated. V3Nb17O50 owns an open and robust shear ReO3 crystal structure, which is constructed by 3 ​× ​3 ​× ​∞ (V,Nb)O6 octahedron-blocks linked by VO4 tetrahedra. The resulting A–B–A layered structure with a large interlayer spacing enables the superior Li+ diffusivity and significant intercalation-pseudocapacitive behavior in V3Nb17O50. The maximum unit-cell volume expansion of V3Nb17O50 discharged to 0.8 ​V is only 3.46% (the smallest value among the known M–Nb–O anode compounds with shear ReO3 structures), leading to the excellent cyclability of V3Nb17O50-MP/V3Nb17O50-SR with 90.0/91.8% capacity retention over 2000 cycles at 10C. V3Nb17O50-MP/V3Nb17O50-SR further exhibits a safe operating potential of 1.736/1.724 ​V, large reversible capacity of 207/254 ​mA ​h g−1 at 0.1C, and high rate performance with 68/123 ​mA ​h g−1 at 10C. A LiMn2O4//V3Nb17O50-SR full cell also exhibits comprehensively good electrochemical properties, including excellent cyclability with 85.7% capacity retention over 500 cycles at 5C. Therefore, V3Nb17O50 can be a very promising anode compound for stable, safe, large-capacity and fast-charging Li+ storage.



中文翻译:

低应变的V 3 Nb 17 O 50阳极化合物,可实现出色的Li +存储

M–Nb–O化合物由于容量大,安全性高和Li +的快速运输而被视为锂离子电池的高级负极材料。但是,在开发新的低应变M–Nb–O化合物以实现出色的可循环性方面仍然存在挑战。在这里,我们利用V 3 Nb 17 O 50作为低应变M–Nb–O阳极化合物,以及V 3 Nb 17 O 50微米大小的颗粒(V 3 Nb 17 O 50 -MP)和亚微米大小的棒( V 3 Nb 17 O 50 -SR)被证明。V 3 Nb 17 O50具有开放且坚固的剪切ReO 3晶体结构,该结构由VO 4四面体连接的3×3×∞(V,Nb)O 6八面体块构成。所得的具有较大层间间距的A–B–A层状结构可在V 3 Nb 17 O 50中实现出色的Li +扩散性和显着的嵌入-伪电容行为。放电至0.8 V的V 3 Nb 17 O 50的最大晶胞体积膨胀仅为3.46%(在已知的具有剪切ReO 3结构的M–Nb–O阳极化合物中是最小值),从而导致出色的循环性V3 Nb 17 O 50 -MP / V 3 Nb 17 O 50 -SR在10C的2000个循环中具有90.0 / 91.8%的容量保持率。V 3 Nb 17 O 50 -MP / V 3 Nb 17 O 50 -SR还表现出1.736 / 1.724 V的安全工作电势,0.1C时207/254 mA hg -1的大可逆容量和高速率性能在10C下为68/123 mA hg -1。LiMn 2 O 4 /// V 3 Nb 17 O 50-SR全电池还具有综合良好的电化学性能,包括出色的循环性能,在5C下500次循环中的容量保持率为85.7%。因此,V 3 Nb 17 O 50可以成为稳定,安全,大容量和快速充电的Li +储存极有希望的负极化合物。

更新日期:2020-05-28
down
wechat
bug