Zhang Xiaotan, Li Jiangxu, Qi Kaiwen, Yang Yongqiang, Liu Dongyan, Wang Tianqi, Liang Shuquan, Lu Bingan, Zhu Yongchun, Zhou Jiang
School of Materials Science and Engineering, Hunan Provincial Key Laboratory of Electronic Packaging and Advanced Functional Materials, Central South University, Changsha, Hunan, 410083, China.
Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning, 110016, China.
Adv Mater. 2022 Sep;34(38):e2205175. doi: 10.1002/adma.202205175. Epub 2022 Aug 21.
The irregular and random electrodeposition of zinc has emerged as a non-negligible barrier for deeply rechargeable aqueous zinc (Zn)-ion batteries (AZIBs), yet traditional texture regulation of the Zn substrate cannot continuously induce uniform Zn deposition. Here, a Janus separator is constructed via parallelly grown graphene sheets modified with sulfonic cellulose on one side of the commercial glass fiber separator through the spin-coating technique. The Janus separator can consistently regulate Zn growth toward a locked crystallographic orientation of Zn(002) texture to intercept dendrites. Furthermore, the separator can spontaneously repel SO and anchor H while allowing effective transport of Zn to alleviate side reactions. Accordingly, the Zn symmetric cell harvests a long-term lifespan over 1400 h at 10 mA cm /10 mAh cm and endures stable cycling over 220 h even at a high depth of discharge (DOD) of 56%. The Zn/carbon nanotube (CNT)-MnO cell achieves an outstanding capacity retention of 95% at 1 A g after 1900 cycles. Furthermore, the Zn/NH V O pouch cell with a Janus separator delivers an initial capacity of 178 mAh g and a high capacity retention of 87.4% after 260 cycles. This work provides a continuous regulation approach to achieve crystallographic homogeneity of the Zn anode, which can be suitable for other metal batteries.
锌的不规则随机电沉积已成为深度可充电水系锌离子电池（AZIBs）不可忽视的障碍，然而传统的锌基底织构调控无法持续诱导锌的均匀沉积。在此，通过旋涂技术在商用玻璃纤维隔膜的一侧构建了一种由磺酸化纤维素修饰的平行生长石墨烯片制成的Janus隔膜。该Janus隔膜能够持续将锌的生长调控至锌（002）织构的锁定晶体取向，以拦截枝晶。此外，该隔膜能够自发排斥硫酸根并锚定氢离子，同时允许锌的有效传输，从而减轻副反应。因此，锌对称电池在10 mA cm²/10 mAh cm²的条件下可实现超过1400小时的长期寿命，即使在56%的高放电深度（DOD）下也能稳定循环超过220小时。锌/碳纳米管（CNT）-MnO电池在1 A g的电流密度下经过1900次循环后，容量保持率高达95%。此外，采用Janus隔膜的锌/ NH₄V₆O₁₆软包电池的初始容量为178 mAh g，在260次循环后具有87.4%的高容量保持率。这项工作提供了一种实现锌负极晶体学均匀性的连续调控方法，该方法也适用于其他金属电池。
