Interfacial Self‐Healing Polymer Electrolytes With Gradient Covalent–Noncovalent Dynamic Bonds for 4.6 V‐Class Lithium Metal Batteries
Interfacial Self‐Healing Polymer Electrolytes With Gradient Covalent–Noncovalent Dynamic Bonds for 4.6 V‐Class Lithium Metal Batteries
研究概述
结合硼酸酯共价动态键与快速氢键，制备可室温修复界面缺陷的聚合物电解质，离子电导率1.6×10⁻³ S/cm，电化学窗口5.2 V。锂对称电池运行超过3000小时；高电压钴酸锂体系可循环700次，并验证1.2 Ah及2.5 Ah软包电池的循环和针刺表现。
谱图与表征信息
FIGURE 5 Microstructural evolution of the cycled LCO cathode with different SHPEs. (a, b) In situ DRT data for different SOCs of LCO|SHPEs|Li during the charge (a) and discharge (b) processes. (c) Cross-sectional SEM images and EDS maps of the LCO cathode after 100 cycles. (d) HR-TEM images and mappings of the LCO cathode after 100 cycles. (e, f) Depth-profiled F 1s (e) and B 1s (f) XPS data of the CEI in LCO|B-F-SHPE|Li. (g) TOF- SIMS 3D reconstruction of the species fragments in the CEI in LCO|B-F-SHPE|Li. (h) Normalized Co K-edge XANES spectra of cycled LCO cathodes. (i–l) HR-TEM images of CEI and internal structure of LCO in LCO|F-SHPE|Li (i, k) and LCO|B-F-SHPE|Li (j, l).