Synergistic Manipulation of Zn2+ Ion Flux and Nucleation Induction Effect Enabled by 3D Hollow SiO2/TiO2/Carbon Fiber for Long-Lifespan and Dendrite-Free Zn–Metal Composite Anodes,Advanced Functional Materials

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Synergistic Manipulation of Zn2+ Ion Flux and Nucleation Induction Effect Enabled by 3D Hollow SiO2/TiO2/Carbon Fiber for Long-Lifespan and Dendrite-Free Zn–Metal Composite Anodes
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-09-13 , DOI: 10.1002/adfm.202106417
Pan Xue _{1,

2} , Can Guo ₃ , Nanyang Wang ₂ , Kaiping Zhu ₂ , Shuang Jing ₁ , Shuo Kong ₁ , Xiaojie Zhang ₁ , Li Li ₄ , Hongpeng Li ₅ , Yongbao Feng ₁ , Wenbin Gong ₆ , Qiulong Li ₁

Affiliation

Aqueous rechargeable zinc–metal batteries are a promising candidate for next-generation energy storage devices due to their intrinsic high capacity, low cost, and high safety. However, uncontrollable dendrite formation is a serious problem, resulting in limited lifespan and poor coulombic efficiency of zinc–metal anodes. To address these issues, a 3D porous hollow fiber scaffold with well-dispersed TiO₂, SiO₂, and carbon is used as superzincophilic host materials for zinc anodes. The amorphous TiO₂ and SiO₂ allow for controllable nucleation and deposition of metal Zn inside the porous hollow fiber even at ultrahigh current densities. Furthermore, the as-fabricated interconnected conductive hollow SiO₂ and TiO₂ fiber (HSTF) possess high porosity, high conductivity, and fast ion transport. Meanwhile, the HSTF exhibits remarkable mechanical strength to sustain massive Zn loading during repeated cycles of plating/stripping. The HSTF with interconnected conductive network can build a uniform electric field, redistributing the Zn²⁺ ion flux and resulting in smooth and stable Zn deposition. As a result, in symmetrical cells, the Zn@HSTF electrode delivers a long cycle life of over 2000 cycles at 20 mA cm⁻² with low overpotential (≈160 mV). The excellent cycling lifespan and low polarization are also realized in Zn@HSTF//MnO₂ full cells.

中文翻译：

3D中空SiO2/TiO2/碳纤维对Zn2+离子通量和成核诱导效应的协同调控，用于长寿命无枝晶锌金属复合阳极

由于其固有的高容量、低成本和高安全性，水性可充电锌金属电池是下一代储能设备的有希望的候选者。然而，不可控制的枝晶形成是一个严重的问题，导致锌金属负极的寿命有限和库仑效率低下。为了解决这些问题，具有良好分散的 TiO ₂、SiO ₂和碳的 3D 多孔中空纤维支架被用作锌阳极的超亲锌主体材料。即使在超高电流密度下，非晶TiO ₂和SiO _{2 也}允许金属Zn在多孔中空纤维内可控地成核和沉积。此外，制造的互连导电中空 SiO ₂和TiO ₂纤维（HSTF）具有高孔隙率、高导电性和快速离子传输。同时，HSTF 表现出显着的机械强度，可以在电镀/剥离的重复循环中承受大量的锌负载。具有互连导电网络的 HSTF 可以建立均匀的电场，重新分配 Zn ²⁺离子通量，从而实现平滑稳定的 Zn 沉积。因此，在对称电池中，Zn@HSTF 电极在 20 mA cm ^{-2 下}提供了超过 2000 次循环的长循环寿命，并且具有低过电位（≈160 mV）。Zn@HSTF//MnO ₂全电池也实现了优异的循环寿命和低极化。

更新日期：2021-09-13

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