水系リチウムイオン–亜鉛二次電池

抄録

Zinc negative electrode has high energy density and less expensive materials for battery in general. However, it generates dendrite when it charged as electrode for secondary battery, therefore, the use for secondary battery is difficult. At this opportunity we would make secondary battery using zinc with aqueous electrolyte. We discovered the dendrite is controlled by glycerin and saccharin in ZnSO₄ solution. Lithium manganate is one of opposite electrodes that performed in this condition. In this study, we made aqueous lithium ion-zinc secondary battery with those electrodes and electrolyte, and evaluated then optimized that performance. This battery has approximately 100% charge-discharge efficiency. Their charge and discharge cycle performance depends on concentration of ZnSO₄ and mass of LiMn₂O₄. The density of most suitable ZnSO₄ for LiMn₂O₄ of each mass may be existing. Relatively higher percentage of LiMn₂O₄ mix has better performance. This battery performed more than 400 charge and discharge cycles as maximum and 70 mAh·g⁻¹ as maximum of discharge capacity was provided. Furthermore, we can expect future improvement of performance as a secondary battery by optimizing these conditions.