2024,
ENERGY & ENVIRONMENTAL MATERIALS.
DOI:
10.1002/eem2.12734
Confluence of ZnO and PTFE Binder for Enhancing Performance of Thin‐Film Lithium‐Ion Batteries
Subhashree Behera, Swathi Ippili, Venkatraju Jella, Na‐Yeong Kim, Seong Cheol Jang, Ji‐Won Jung, Soon‐Gil Yoon, Hyun‐Suk Kim
Abstract:
Developing anode materials with high specific capacity and cycling stability is vital for improving thin‐film lithium‐ion batteries. Thin‐film zinc oxide (ZnO) holds promise due to its high specific capacity, but it suffers from volume changes and structural stress during cycling, leading to poor battery performance. In this research, we ingeniously combined polytetrafluoroethylene (PTFE) with ZnO using a radio frequency (RF) magnetron co‐sputtering method, ensuring a strong bond in the thin‐film composite electrode. PTFE effectively reduced stress on the active material and mitigated volume change effects during Li+ ion intercalation and deintercalation. The composite thin films are thoroughly characterized using advanced techniques such as X‐ray diffraction, scanning electron microscopy, and X‐ray photoelectron spectroscopy for investigating correlations between material properties and electrochemical behaviors. Notably, the ZnO/PTFE thin‐film electrode demonstrated an impressive specific capacity of 1305 mAh g−1 (=7116 mAh cm−3 ) at a 0.5C rate and a remarkable capacity retention of 82% from the 1st to the 100th cycle, surpassing the bare ZnO thin film (50%). This study provides valuable insights into using binders to stabilize active materials in thin‐film batteries, enhancing battery performance.
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2024-04-30 21:53:00
#paper doi:10.1002/eem2.12734, Energy&Environmental Materials, 2024, Confluence of ZnO and PTFE Binder for Enhancing Performance of Thin-Film Lithium-Ion Batteries。开发具有高比容量和循环稳定性的负极材料对于改进薄膜锂离子电池至关重要。 薄膜氧化锌（ZnO）由于其高比容量而具有前景，但它在循环过程中会受到体积变化和结构应力的影响，导致电池性能较差。本文用磁控溅射方法聚四氟乙烯（PTFE）与ZnO结合在一起，确保了薄膜复合电极的牢固结合。PTFE有效降低了活性材料上的应力并减轻了Li+离子嵌入和脱嵌过程中的体积变化影响。ZnO/PTFE薄膜电极从第1次到第100次循环的容量保持率高达82%，超过了裸ZnO薄膜的50%