Bio-Inspired Polyanionic Electrolytes for Highly Stable Zinc-Ion Batteries
Bio-Inspired Polyanionic Electrolytes for Highly Stable Zinc-Ion Batteries
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用于高度稳定锌离子电池的仿生聚阴离子电解质
DOI：
10.1002/ange.202311268
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发表时间：
2023
影响因子：
--
通讯作者：
Dong H
中科院分区：
文献类型：
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作者：
Dong H
对于锌离子电池（ZIB），不均匀的Zn电镀/剥离导致高极化和低库仑效率（CE），阻碍了ZIB的大规模应用。在这里，受生物质海藻植物的启发，使用阴离子海藻酸（SA）来引发在Zn阳极上原位形成高性能固体电解质界面（SEI）层。由于−COO−的阴离子基团，Zn 2+离子对海藻酸的亲和力诱导了均匀电镀的良好排列的加速通道。该SEI调节Zn 2+的去溶剂化结构，并促进致密Zn（002）晶面的形成。即使在高放电深度条件（DOD）下，SA涂覆的Zn阳极仍然保持稳定的Zn剥离/电镀行为，具有低电位差（0.114 V）。 根据经典成核理论，SA涂覆的Zn的成核能比裸Zn的成核能低97%，从而导致更快的成核速率。的Zn||组装有SA涂层电极的Cu电池在1，400次循环中表现出99.8%的出色平均CE。该设计在软包电池中得到成功证明，其中SA涂覆的Zn表现出96.9%的容量保持率，而裸Zn阳极的容量保持率为59.1%，即使在高阴极质量负载（>10 mg/cm 2）下也是如此。
For zinc‐ion batteries (ZIBs), the non‐uniform Zn plating/stripping results in a high polarization and low Coulombic efficiency (CE), hindering the large‐scale application of ZIBs. Here, inspired by biomass seaweed plants, an anionic polyelectrolyte alginate acid (SA) was used to initiate the in situ formation of the high‐performance solid electrolyte interphase (SEI) layer on the Zn anode. Attribute to the anionic groups of −COO−, the affinity of Zn2+ions to alginate acid induces a well‐aligned accelerating channel for uniform plating. This SEI regulates the desolvation structure of Zn2+and facilitates the formation of compact Zn (002) crystal planes. Even under high depth of discharge conditions (DOD), the SA‐coated Zn anode still maintains a stable Zn stripping/plating behavior with a low potential difference (0.114 V). According to the classical nucleation theory, the nucleation energy for SA‐coated Zn is 97 % less than that of bare Zn, resulting in a faster nucleation rate. The Zn||Cu cell assembled with the SA‐coated electrode exhibits an outstanding average CE of 99.8 % over 1,400 cycles. The design is successfully demonstrated in pouch cells, where the SA‐coated Zn exhibits capacity retention of 96.9 % compared to 59.1 % for bare Zn anode, even under the high cathode mass loading (>10 mg/cm2).