首页|An aqueous BiI3-Zn battery with dual mechanisms of Zn2+(de)intercalation and I-/I2 redox
An aqueous BiI3-Zn battery with dual mechanisms of Zn2+(de)intercalation and I-/I2 redox
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The development of aqueous battery with dual mechanisms is now arousing more and more interest.The dual mechanisms of Zn2+(de)intercalation and I-/I2 redox bring unexpected effects.Herein,differing from previous studies using ZnI2 additive,this work designs an aqueous BiI3-Zn battery with self-supplied I-.Ex situ tests reveal the conversion of BiI3 into Bi(discharge)and BiOI(charge)at the 1st cycle and the dissolved I-in electrolyte.The active I-species enhances the specific capacity and discharge medium voltage of electrode as well as improves the generation of Zn dendrite and by-product.Furthermore,the porous hard carbon is introduced to enhance the electronic/ionic conductivity and adsorb iodine species,proven by experimental and theoretical studies.Accordingly,the well-designed BiI3-Zn battery delivers a high reversible capacity of 182 mA hg-1 at 0.2 A g-1,an excellent rate capability with 88 mA h g-1 at 10 A g-1,and an impressive cyclability with 63％capacity retention over 20 K cycles at 10 A g-1.An excellent electrochemical performance is obtained even at a high mass loading of 6 mg cm2.Moreover,a flexible quasi-solid-state BiI3-Zn battery exhibits satisfactory battery perfor-mances.This work provides a new idea for designing high-performance aqueous battery with dual mechanisms.
Qi Deng、Fangzhong Liu、Xiongwei Wu、Changzhu Li、Weibin Zhou、Bei Long
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State Key Laboratory of Utilization of Woody Oil Resource,Key Laboratory of National Forestry and Grassland Administration on Utilization Science for Southern Woody Oil Resources,Hunan Provincial Key Laboratory of Oils & Fats Molecular Structure and Function,Hunan Academy of Forestry,Changsha 410004,Hunan,China
School of Chemistry,Xiangtan University,Xiangtan 411105,Hunan,China
School of Chemistry and Materials Science,Hunan Agricultural University,Changsha 410128,Hunan,China
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