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New Prelithiated V2O5 Superstructure for Lithium-Ion Batteries with Long Cycle Life and High Power
ACS Energy Letters ( IF 19.3 ) Pub Date : 2019-12-02 , DOI: 10.1021/acsenergylett.9b02048
WenWu Zhong 1 , Jingdong Huang 2 , Shuquan Liang 2 , Jun Liu 3 , Yejing Li 2 , Gemei Cai 2 , Yong Jiang 2 , Jun Liu 2
Affiliation  

Vanadium pentoxide (V2O5) is an attractive high-capacity cathode material for lithium-ion batteries but is limited by the poor structural stability. In this work, we report the synthesis and properties of a new lithium-ordered superstructure of Li0.0625V2O5 through controlled prelithiation treatment. Compared to VO5 square pyramids in a pure α-V2O5 structure, the distorted VO5 square pyramid in this superstructure imparts an intrinsic layer structure with improved stability, expanded c-plane spacing, as well as expansion in the a-axis. In the voltage range of 2.5–4.0 V vs Li/Li+, Li0.0625V2O5 nanobelts with lithium-ordered superstructures exhibit a specific capacity up to 215 mAh g–1, ultrahigh cycling capability, and high rate capability. Cyclic voltammograms of lithium insertion into Li0.0625V2O5 nanobelts also demonstrate two new pairs of reversible pseudocapacitive peaks in addition to the ordinary peaks of Li+ insertion into the pure orthorhombic α-V2O5.

中文翻译:

锂离子电池的新型预锂化V 2 O 5上层结构,具有长循环寿命和高功率

五氧化二钒(V 2 O 5)是一种有吸引力的高容量锂离子电池正极材料,但由于结构稳定性差而受到限制。在这项工作中,我们报告了通过可控的预锂化处理,制备了新的锂有序的Li 0.0625 V 2 O 5锂有序超结构及其性质。相比VO 5个在纯α-V正方锥2 ø 5结构中,扭曲VO 5在此上层建筑面授正方棱锥的本征层结构具有改善的稳定性,扩展Ç -平面间距,以及在膨胀-轴。在相对于Li / Li +的2.5–4.0 V电压范围内,具有锂有序超结构的Li 0.0625 V 2 O 5纳米带显示出高达215 mAh g –1的比容量,超高循环能力和高倍率能力。锂插入的循环伏安到锂0.0625 V 2 ø 5纳米带还证明了两个新的对除了Li的普通峰可逆赝峰+插入纯的斜方晶α-V 2 ø 5
更新日期:2019-12-02
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