Qi Liu, Yongjie Dan, Yanhua Niu, Yadong Lv, Guangxian Li
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引用次数: 0
摘要
离子电导率不足、Li+转移数(tLi+)有限以及电化学窗口狭窄严重限制了聚环氧乙烷(PEO)基聚合物电解质(PEs)的实际应用。本文设计了一种新型深共晶溶剂(DES)基 PEO PE,用于稳定高压锂金属电池(LMB)。DES 降低了 PEO 的结晶度,同时促进了 LiTFSI 的解离,释放出更多的游离 Li+,从而促进了 Li+ 在 PEO 基体中的传输。此外,DES 与 PEO 之间的相互作用提高了基于 PEO 的 PE 在高电压下的稳定性。因此,PEO-DES-FEC(简称 PDF)聚乙烯具有令人满意的离子导电性、良好的机械性能和较高的电化学稳定性。同时,PDF PE 还能构建稳固/均匀的富锂离子固体电解质界面(SEI),确保电极/电解质界面的稳定性。作为概念验证,PDF PE 的锂对称电池和 Li||LiFePO4 LMB 具有良好的循环稳定性。基于 PDF PE 的电池在 4.3 V 和 4.5 V 电压下具有优异的循环性能。这是基于 PEO 的电解质在 4.5 V 高压条件下的成功示范之一,突破了传统基于 PEO 的 PE 的电压限制。
A Highly Compatible Deep Eutectic Solvent-Based Poly(ethylene) Oxide Polymer Electrolyte to Enable the Stable Operation of 4.5 V Lithium Metal Batteries
Insufficient ionic conductivity, limited Li+ transfer number (tLi+), and narrow electrochemical windows have heavily restricted the actual application of PEO (poly(ethylene) oxide)-based polymer electrolytes (PEs). Herein, a novel deep eutectic solvent (DES)-based PEO PE for stabilizing high voltage lithium metal battery (LMB) is designed. The DES reduces the crystallinity of PEO while promoting the dissociation of LiTFSI to release more free Li+, thus facilitating the transport of Li+ in the PEO matrix. In addition, the interaction between DES and the PEO, thereby improving the stability of the PEO-based PE under high voltage. Consequently, the PEO-DES-FEC (for short PDF) PE possesses satisfactory ionic conductivity, good mechanical properties, and high electrochemical stability. Meanwhile, PDF PE can build a robust/uniform LiF-rich solid electrolyte interface (SEI) to ensure electrode/electrolyte interface stability. As a concept proof, the Li symmetrical battery and Li||LiFePO4 LMBs of PDF PE exhibit good cycle stability. Applied to the high voltage Li||NCM811 LMBs, the PDF PE-based cell has excellent cycling performance at 4.3 and 4.5 V. This tactic is one of the successful demonstrations of PEO-based electrolytes under 4.5 V high voltage conditions, which breaks through the voltage constraint of conventional PEO-based PEs.
期刊介绍:
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