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29th COCHE Seminar Report – Flexible Devices

The 29th COCHE Seminar, chaired by Professor Peng SHI and Professor Ni ZHAO, under the theme of “Flexible Devices”, concluded successfully on 27th April 2023. Professor Chunyi ZHI’s research team from COCHE shared about their research work. XIONG Qi proposed that LiPFOA can act as a bifunctional additive to generate robust SEI and CEI for improving the stability of cathode and anode, then the LCO and NCM battery present much longer cycling lifetime. He has also achieved to power the brain wave electronic sensor with the flexible pouch cell. In next step, he will try to achieve high-energy-density flexible battery for flexible electronic sensors and will integrate it for more clinic studies. ZHANG Dechao developed a PVHF-FDMA solid polymer electrolyte using fluorine-riched electrolytes that improves the interface stability with lithium metal anodes, enabling uniform deposition and the inhibition of dendrite growth. The solid electrolyte demonstrates high ionic conductivity, excellent flame retardancy, and chemical stability with Li metal, and shows good rate performance and long cycling stability in LiFePO4/Li and LiCoO2/Li full cells. The flexible pouch cell delivers over 30 mAh current and maintains a stable output voltage under bending conditions, making it highly practical for wearable devices. LI Shimei develops a class of polymer brushes-based composite polymer electrolyte with fast ion transport for flexible lithium metal batteries. With composite polymer electrolyte, the critical current density (CCD) of the cell is increased and displayed smaller polarization voltage at different current densities. To further evaluate the electrochemical performances of the composite polymer electrolytes in potential practical application, he assembles Li|NCM811 pouch batteries. The pouch cell exhibits high flexibility, consistently powering sensors even under bend condition, which demonstrates great prospects for their practical application in flexible devices. HUANG Zhaodong proposed a strategy to prepare flexible electrodes and polymer electrolytes based on thermoplastic elastomers to construct an all-flexible battery was proposed. The as-prepared all-flexible battery exhibits large areal capacity of over 4 mAh cm-2 together with excellent flexibility at the same time.

第 29 届 COCHE 研讨会 — 柔性设备记录报告

在史鹏教授和赵妮教授的联席主持下,以 "柔性设备”为主题的 第 29 届 COCHE 研讨会于 2023 年 4 月 27 日圆满举办。 来自 COCHE 的支春义教授团队成员分享了他们的工作。 熊琦提出,LiPFOA 添加剂可以作为一种双功能添加剂,生成稳定高效的 SEI 和 CEI,以提高正负极的稳定 性,然后使 LCO 和 NCM 电池呈现更长的循环寿命。他还实现了用软包电池为脑电波传感器供电。下一 步,他将尝试为柔性电子传感器实现高能量密度的柔性电池,并将其整合到更多的临床研究中。 张德超使用富氟电解液开发了 PVHF-FDMA 固态聚合物电解质,提高了与锂金属阳极的界面稳定性,实 现了均匀沉积和抑制树枝生长。该固态电解质具有高离子导电性、优异的阻燃性和锂金属的化学稳定性, 并在 LiFePO4/Li 和 LiCoO2/Li 全电池中表现出良好的速率和长循环稳定性。带有此种电解质的柔性软包电 池可输出超过 30 毫安的电流,并在弯曲条件下保持稳定的输出电压,非常适用于可穿戴设备。 李始美开发了一种基于聚合物刷的复合聚合物电解质,具有快速离子传输能力,适用于柔性锂金属电池。 使用复合聚合物电解质,电池的临界电流密度(CCD)增加,且在不同电流密度下显示出较小的极化电 压。为了进一步评估复合聚合物电解质在潜在实际应用中的电化学性能,他组装了 Li|NCM811 软包电池。 该软包电池具有优异的柔性,在弯曲条件下依然可以持续为传感器供电,展示了它在柔性设备中的巨大 应用前景。 黄兆东提出了一种基于热塑性弹性体制备柔性电极和聚合物电解质的策略,构建了一种全柔性电池。所 制备的电池具有超过 4 毫安时/平方厘米的大容量,同时具有良好的柔性。


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