Hydrated Intercalation for High-Performance Aqueous Zinc Ion Batteries

被引:310
作者
Shin, Jaeho [1 ,2 ]
Choi, Dong Shin [3 ]
Lee, Hyeon Jeong [1 ,2 ]
Jung, Yousung [3 ,4 ]
Choi, Jang Wook [1 ,2 ]
机构
[1] Seoul Natl Univ, Sch Chem & Biol Engn, 1 Gwanak Ro, Seoul 08826, South Korea
[2] Seoul Natl Univ, Inst Chem Proc, 1 Gwanak Ro, Seoul 08826, South Korea
[3] Korea Adv Inst Sci & Technol, Grad Sch Energy Environm Water & Sustainabil EEWS, 291 Daehak Ro, Daejeon 34141, South Korea
[4] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, 291 Daehak Ro, Daejeon 34141, South Korea
关键词
aqueous batteries; density functional theory; hydrated intercalation; vanadium oxide; zinc; X-RAY-ABSORPTION; PRUSSIAN BLUE ANALOG; CATHODE MATERIAL; HIGH-ENERGY; CRYSTAL WATER; V6O13; DIFFRACTION; CHEMISTRY; DIOXIDE; MG2+;
D O I
10.1002/aenm.201900083
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Aqueous zinc ion batteries (AZIBs) are steadily gaining attention based on their attractive merits regarding cost and safety. However, there are many obstacles to overcome, especially in terms of finding suitable cathode materials and elucidating their reaction mechanisms. Here, a mixed-valence vanadium oxide, V6O13, that functions as a stable cathode material in mildly acidic aqueous electrolytes is reported. Paired with a zinc metal anode, this material exhibits performance metrics of 360 mAh g(-1) at 0.2 A g(-1), 92% capacity retention after 2000 cycles, and 145 mAh g(-1) at a current density of 24.0 A g(-1). A combination of experiments and density functional theory calculations suggests that hydrated intercalation, where water molecules are cointercalated with Zn ions upon discharge, accounts for the aforementioned electrochemical performance. This intercalation mechanism facilitates Zn ion diffusion throughout the host lattice and electrode-electrolyte interface via electrostatic shielding and concurrent structural stabilization. Through a correlation of experimental data and theoretical calculations, the promise of utilizing hydrated intercalation as a means to achieve high-performance AZIBs is demonstrated.
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页数:11
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