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Enabling Stable Interphases via In Situ Two-Step Synthetic Bilayer Polymer Electrolyte for Solid-State Lithium Metal Batteries
| Content Provider | MDPI |
|---|---|
| Author | Liu, Ying Fu, Fang Sun, Chen Zhang, Aotian Teng, Hong Sun, Liqun Xie, Haiming |
| Copyright Year | 2022 |
| Description | Poly(ethylene oxide) (PEO)-based electrolyte is considered to be one of the most promising polymer electrolytes for lithium metal batteries. However, a narrow electrochemical stability window and poor compatibility at electrode-electrolyte interfaces restrict the applications of PEO-based electrolyte. An in situ synthetic double-layer polymer electrolyte (DLPE) with polyacrylonitrile (PAN) layer and PEO layer was designed to achieve a stable interface and application in high-energy-density batteries. In this special design, the hydroxy group of PEO-SPE can form an $O-H^{---}$N hydrogen bond with the cyano group in PAN-SPE, which connects the two layers of DLPE at a microscopic chemical level. A special $Li^{+}$ conducting mechanism in DLPE provides a uniform $Li^{+}$ flux and fast $Li^{+}$ conduction, which achieves a stable electrolyte/electrode $interface.LiFePO_{4}$/DLPE/Li battery shows superior cycling stability, and the coulombic efficiency remains 99.5% at 0.2 C. Meanwhile, $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_{2}$/DLPE/Li battery shows high specific discharge capacity of 176.0 mAh $g^{−1}$ at 0.1 C between 2.8 V to 4.3 V, and the coulombic efficiency remains 95% after 100 cycles. This in situ synthetic strategy represents a big step forward in addressing the interface issues and boosting the development of high-energy-density lithium-metal batteries. |
| Starting Page | 42 |
| e-ISSN | 23046740 |
| DOI | 10.3390/inorganics10040042 |
| Journal | Inorganics |
| Issue Number | 4 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-03-29 |
| Access Restriction | Open |
| Subject Keyword | Inorganics Electrochemistry Solid-state Lithium Metal Battery Solid Polymer Electrolyte Double-layer Electrolyte Interfacial Stability |
| Content Type | Text |
| Resource Type | Article |
