A High-Rate and Stable Quasi-Solid-State Zinc-Ion Battery with Novel 2D Layered Zinc Orthovanadate Array
A High-Rate and Stable Quasi-Solid-State Zinc-Ion Battery with Novel 2D Layered Zinc Orthovanadate Array
复制标题
DOI：
10.1002/adma.201803181
复制
发表时间：
2018-08-09
影响因子：
29.4
通讯作者：
Fan, Hong Jin
中科院分区：
文献类型：
--
作者：
Chao, Dongliang;Zhu, Changrong (Rose);Fan, Hong Jin
锌离子电池以其低成本、高安全性等优点成为当前研究的热点。然而，仍然期望通过改善Zn 2+嵌入（脱嵌）动力学来改善速率性能，并且通过消除枝晶形成问题来改善长循环稳定性。本文中，高倍率和超稳定柔性准固态锌离子电池的第一范例由新型2D层状原钒酸锌阵列阴极、由导电多孔石墨烯泡沫支撑的Zn阵列阳极和凝胶电解质构造。两种电极的纳米阵列结构确保了高速率能力并抑制了枝晶生长。柔性锌离子电池的阴极放电深度接近100%，阳极放电深度接近66%，并提供令人印象深刻的50 C高倍率（60秒内放电），在20 ℃下2000次循环的长期耐久性，以及前所未有的接近115 Wh kg（-1）的能量密度，以及接近5.1kW kg（-1）的峰值功率密度（计算包括阴极、阳极和集电器的质量）。第一性原理计算和定量动力学分析表明，高速率和稳定的性能与二维快速离子迁移路径和引入的嵌入赝电容。
Zinc-ion batteries are under current research focus because of their uniqueness in low cost and high safety. However, it is still desirable to improve the rate performance by improving the Zn2+ (de)intercalation kinetics and long-cycle stability by eliminating the dendrite formation problem. Herein, the first paradigm of a high-rate and ultrastable flexible quasi-solid-state zinc-ion battery is constructed from a novel 2D ultrathin layered zinc orthovanadate array cathode, a Zn array anode supported by a conductive porous graphene foam, and a gel electrolyte. The nanoarray structure for both electrodes assures the high rate capability and alleviates the dendrite growth. The flexible Zn-ion battery has a depth of discharge of approximate to 100% for the cathode and 66% for the anode, and delivers an impressive high-rate of 50 C (discharge in 60 s), long-term durability of 2000 cycles at 20 C, and unprecedented energy density approximate to 115 Wh kg(-1), together with a peak power density approximate to 5.1 kW kg(-1) (calculation includes masses of cathode, anode, and current collectors). First principles calculations and quantitative kinetics analysis show that the high-rate and stable properties are correlated with the 2D fast ion-migration pathways and the introduced intercalation pseudocapacitance.