High-Performance Alginate-Poly(ethylene oxide)-Based Solid Polymer Electrolyte

Jie Liu

doi:10.1021/acsami.4c22242

2025-02-24

PRE

DOI：10.1021/acsami.4c22242

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摘要

En 中文

固态聚合物电解质（SPEs）因其有望解决液态电解质引发的安全问题而受到广泛关注。然而，其低离子传输能力、不足的机械强度以及不理想的阻燃性能极大地限制了其进一步应用。在此，我们通过引入静电纺丝制备的钙 alginate（CA）纳米纤维膜作为骨架，设计了一种聚乙烯醇（PEO）基SPE。CA大分子中的丰富C=O和-OH基团不仅有效削弱了锂离子（Li+）的配位环境，还促进了LiTFSI的解离，有助于Li+沿PEO聚合物链迁移并提供有效的Li+传输通道。在交联过程中引入钙离子（Ca2+）改善了SPE的阻燃性能。所得SPE表现出高离子电导率（3.86×10⁻⁴ S cm⁻¹，30°C）、优异的机械强度（2.01 MPa）和宽广的电化学窗口（5.32 V）。组装的锂对称电池在30°C下可实现3000小时的稳定锂沉积/剥离。同时，LiFePO4（LFP）/Li全固态锂金属电池在0.3 C和30°C下经过300次循环后展现出优异的循环稳定性，具有高放电容量（141.2 mAh g⁻¹）和保持率（92.5%）。

Keyword:

alginate

poly(ethylene oxide)

nanofiber membrane

solid polymer electrolyte

ion conductivity

期刊

ACS Applied Materials and Interfaces

IF:

8.2

论文数:

6.1W

被引数:

38.7W

机构

Ocean Univ China

学者数:

3.3K

论文数: 1.3K

被引数: 394

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