In situ crosslinked hybrid aluminum polymer film for high-performance solid electrolyte interphase of lithium metal battery
In situ crosslinked hybrid aluminum polymer film for high-performance solid electrolyte interphase of lithium metal battery
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DOI：
10.1016/j.jpowsour.2023.232808
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发表时间：
2023-04
影响因子：
9.2
通讯作者：
Dandan Li;Zhaoyang Wei;Weiwei Lei;Jun You;Jie Liu;Yingkui Yang;D. Shi
中科院分区：
文献类型：
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作者：
Dandan Li;Zhaoyang Wei;Weiwei Lei;Jun You;Jie Liu;Yingkui Yang;D. Shi
建立稳定细小的固体电解液界面(SEI)是抑制金属锂电池枝晶生成和生长的关键。铝杂化聚合物被认为是潜在的人工SEI薄膜材料。在此，通过乙醇铝、聚乙二醇酯(PEG)和甲氧基聚乙二醇酯(Mpeg)的醇解反应制备Al-聚乙二醇酯预聚体。然后，将上述铝杂化预聚体与六亚甲基二异氰酸酯(THDI)三聚体进行原位交联反应，得到了模数可调的人工SEI薄膜。其室温锂离子电导率、锂离子迁移数和溶液浸泡后的杨氏模数分别为2.2 0×10−3 S cm−1、0.79和0.4 Gpa。镀膜后，当电流密度为5 mA cm−2时，电池的极化电压约为10 0 mV，电流密度为5 mAhcm−2时，电池的极化电压约为70 0 mV。在30°C下循环500次后，Li@ASI||LFP充满电池在1C下的容量保持率为81%。而相应的Li||LFP电池只有48%。即使在2℃下循环1000次，Li@ASI||LFP满电池仍有72%的容量保持。
Building a stable and fine solid electrolyte interphase (SEI) is quite critical to inhibiting the generation and growth of dendrites in lithium metal batteries. Aluminum hybrid polymers are believed to be the potential materials for artificial SEI films. Herein, the Al-PEG prepolymer is prepared via an alcoholysis reaction of aluminum ethoxide, polyethylene glycol (PEG), and methoxy polyethylene glycol (MPEG). Then, the according artificial SEI (ASEI) films with tunable modulus are obtained via in-situ crosslinking reaction of the above aluminum hybrid prepolymer with the trimer of hexamethylene diisocyanate (THDI). Its lithium ionic conductivity at room temperature, lithium ionic transference number, and Young's modulus after electrolyte soaking are 2.20× 10− 3 S c m− 1, 0.79, and 0.4 GPa, respectively. After ASEI coating, the polarization voltage of the Li@ ASEI|| Li@ ASEI cell is about 100 mV at a current density of 5 mA cm− 2 for 5 mAh cm− 2 and that of the Li|| Li cell is 700 mV. After 500 cycles at 30° C, the capacity retention of Li@ ASEI|| LFP full cell is 81% at 1C. While that for the according Li|| LFP cell is only 48%. Even after 1000 cycles at 2C, Li@ ASEI|| LFP full cell still has 72% capacity retention.