Heterocyclic polymer supported cathode/Li interface layers to lower the operational temperature of PEO-based Li-batteries
Heterocyclic polymer supported cathode/Li interface layers to lower the operational temperature of PEO-based Li-batteries
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DOI：
10.1016/j.nanoen.2023.108975
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发表时间：
2023-12
期刊：
影响因子：
17.6
通讯作者：
Jingang Zheng;Shaojun Liu;Hao Huang;Hongxu Zhou;Hongyang Li;Lixiang Li;Guangshen Jiang;
中科院分区：
文献类型：
--
作者：
Jingang Zheng;Shaojun Liu;Hao Huang;Hongxu Zhou;Hongyang Li;Lixiang Li;Guangshen Jiang;
高性能聚氧乙烯(PEO)基固态聚合物锂电池(≤-25-℃)在低温下存在界面电阻大、离子导电性低等问题。其中阴阳极界面层(PPL)由溴掺杂的聚(3，4-乙二氧基噻吩基)(PEDOT)、聚氧化乙烯(PEO)和双三氟甲基磺酰亚胺(LiTFSI)组成，具有混合离子/电子导电特性；阳极-电解液界面层(PVCL)由聚碳酸乙烯(PVC)、PEO和LiTFSI组成，具有较强的快速离子导电性。得益于聚氯乙烯的PEDOT导电性、高机械强度以及热诱导反应产生的良好界面亲和力，固态PEO基磷酸铁锂电池的界面电阻低至11.02nAΩ，比没有界面修饰的电池降低了92%，并且在0.1C(25℃)时的放电容量为164.4 mAhg−1，在10℃时的放电容量高达115.9 mAhg−1。X射线光电子能谱分析表明，循环后LiF、Li3N和LiBr3种元素在锂金属表面的富集，进一步提高了锂电池循环的稳定性。双界面构建策略为解决SSLBS的界面瓶颈问题提供了一种可靠的方法。
High-performance poly (ethylene oxide) (PEO)-based solid-state polymer Li-batteries (SSLBs) at low temperature (≤ 25 ℃) is hindered by high interfacial resistance and low ionic conductivity. Herein, we simultaneously construct cathode and anode interface layers via in-situ heat-induced heterocyclic polymerization reaction, where the cathode-electrolyte interface layer (PPL) consists of bromine-doped poly (3,4-ethylene-dioxy-thiophene) (PEDOT), PEO and bis-trifluoromethanesulfonimide (LiTFSI), featuring with mixed ionic/electronic conduction, and the anode-electrolyte interface layer (PVCL) was formed by poly (vinyl carbonate) (PVC), PEO and LiTFSI, having a robust fast ionic conduction. Benefiting from the PEDOT conductivity, high mechanical strength of PVC and good interface affinity aroused by heat-induced reaction, the solid-state PEO-based LiFePO4||Li cell shows low interfacial resistance of 11.02 Ω that decreased by 92% compared to the cell without interface modification, and delivering a discharge capacity of 164.4 mAh g−1at 0.1 C (25 ℃), as high as 115.9 mAh g−1at 10 ℃. X-ray photoelectron spectroscopy revealed the enrichment of LiF, Li3N and LiBr on the lithium metal surface after cycling, further enhancing stable cycling Li-batteries. The dual interface-constructed strategy provides a reliable way to resolve the bottle-neck interfacial issues of SSLBs.