MIL-47(V) Derived V2O5@Carbon Core-Shell Microcuboids with Oxygen Vacancies as Advanced Conversion Cathodes for High-Performance Zinc-Ion Batteries

被引：19

作者：

He, Tianqi ^{[1
]}

Li, Jinhang ^{[1
]}

Luo, Zhengzhi ^{[1
]}

Zhang, Yuqiang ^{[1
]}

Zhao, Yingying ^{[1
,2
]}

Zhang, Xitian ^{[4
,5
]}

Chen, Yujin ^{[1
,2
,3
]}

机构：

[1] Harbin Engn Univ, Coll Phys & Optoelect Engn, Minist Educ, Key Lab In Fiber Integrated Opt, Harbin 150001, Peoples R China

[2] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Minist Educ, Lab Superlight Mat & Surface Technol, Harbin 150001, Peoples R China

[3] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China

[4] Harbin Normal Univ, Key Lab Photon & Elect Bandgap Mat, Minist Educ, Harbin 150025, Peoples R China

[5] Harbin Normal Univ, Sch Phys & Elect Engn, Harbin 150025, Peoples R China

来源：

CHEMELECTROCHEM | 2022年 / 9卷 / 10期

基金：

中国国家自然科学基金;

关键词：

V2O5; cathode; oxygen vacancies; carbon shell; zinc-ion battery; metal-organic frameworks; V2O5; MECHANISMS;

D O I：

10.1002/celc.202200178

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Vanadium pentoxide (V2O5) has been considered one of the most promising cathodes for zinc-ion batteries (ZIBs) due to its outstanding theoretical capacity (589 mAh g(-1)). However, it remains great challenge to achieve the high capacity, limited to the poor electronic conductivity and sluggish ionic diffusion kinetics of V2O5. Herein, a controllable strategy is proposed to synthesize V2O5@carbon core-shell microcuboids with oxygen vacancies (V2O5-x@CCSMs) derived from MIL-47(V) used for cathodes of ZIBs. The obtained V2O5-x@CCSMs cathode delivers high capacities of 485.4 and 392.1 mAh g(-1) at 0.1 and 2.0 A g(-1), respectively. The superior electrochemical performances originate from the nano-sized particles of V2O5, oxygen vacancies and carbon shell. Further, ex-situ XRD indicates V2O5 undergoes a shrinking core model conversion reaction at initial cycling to a new phase of Zn3V2O7(OH)(2) center dot 2H(2)O, which is an ideal host for Zn2+. Our work offers an innovative strategy to develop high-capacity cathode in ZIBs.

引用

页数：8

共 55 条

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