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Ultrastable Graphite-Potassium Anode through Binder Chemistry
Small ( IF 13.0 ) Pub Date : 2023-08-30 , DOI: 10.1002/smll.202302987 Zhifei Mao 1 , Xiaojun Shi 1 , Taoqiu Zhang 1 , Zhi Zheng 1 , Xueying Liang 1 , Rui Wang 1 , Jun Jin 1 , Beibei He 1 , Yansheng Gong 1 , Huanwen Wang 1
Small ( IF 13.0 ) Pub Date : 2023-08-30 , DOI: 10.1002/smll.202302987 Zhifei Mao 1 , Xiaojun Shi 1 , Taoqiu Zhang 1 , Zhi Zheng 1 , Xueying Liang 1 , Rui Wang 1 , Jun Jin 1 , Beibei He 1 , Yansheng Gong 1 , Huanwen Wang 1
Affiliation
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Graphite with abundant reserves has attracted enormous research interest as an anode of potassium-ion batteries (PIBs) owing to its high plateau capacity of 279 mAh g−1 at ≈0.2 V in conventional carbonate electrolytes. Unfortunately, it suffers from fast capacity decay during K+ storage. Herein, an ultrastable graphite-potassium anode is developed through binder chemistry. Polyvinyl alcohol (PVA) is utilized as a water-soluble binder to generate a uniform and robust KF-rich SEI film on the graphite surface, which can not only inhibit the electrolyte decomposition, but also withstand large volume expansion during K+-insertion. Compared to the PVDF as binder, PVA-based graphite anode can operate for over 2000 cycles (running time of 406 days at C/3) with 97% capacity retention in KPF6-based electrolytes. The initial Coulombic efficiency (ICE) of graphite anode is as high as 81.6% using PVA as the binder, higher than that of PVDF (40.1%). Benefiting from the strong adhesion ability of PVA, a graphite||fluorophosphate K-ion full battery is further built through 3D printing, which achieves a record-high areal energy of 8.9 mWh cm−2 at a total mass loading of 38 mg cm−2. These results demonstrate the important role of binder in developing high-performance PIBs.
中文翻译：
通过粘合剂化学制备超稳定石墨钾阳极
储量丰富的石墨作为钾离子电池（PIB）的阳极引起了广泛的研究兴趣，因为它在传统碳酸盐电解质中在约0.2 V时具有279 mAh g -1的高平台容量。不幸的是，它在 K +存储过程中容量会快速衰减。在此，通过粘合剂化学开发了超稳定石墨钾阳极。利用聚乙烯醇（PVA）作为水溶性粘合剂，在石墨表面生成均匀且坚固的富含KF的SEI膜，该膜不仅可以抑制电解质分解，而且可以承受K +插入过程中较大的体积膨胀。与作为粘合剂的 PVDF 相比，基于 PVA 的石墨阳极可以运行超过 2000 个循环（在 C/3 下运行时间为 406 天），并且在 KPF 6基电解质中容量保持率为 97%。以PVA为粘结剂的石墨负极的初始库仑效率（ICE）高达81.6%，高于PVDF（40.1%）。受益于PVA强大的粘附能力，通过3D打印进一步构建石墨||氟磷酸钾离子全电池，在38 mg cm -的总质量负载下实现了8.9 mWh cm -2的创纪录面积能量 - 2 .这些结果证明了粘合剂在开发高性能 PIB 中的重要作用。
更新日期：2023-08-30
中文翻译：
通过粘合剂化学制备超稳定石墨钾阳极
储量丰富的石墨作为钾离子电池（PIB）的阳极引起了广泛的研究兴趣，因为它在传统碳酸盐电解质中在约0.2 V时具有279 mAh g -1的高平台容量。不幸的是，它在 K +存储过程中容量会快速衰减。在此，通过粘合剂化学开发了超稳定石墨钾阳极。利用聚乙烯醇（PVA）作为水溶性粘合剂，在石墨表面生成均匀且坚固的富含KF的SEI膜，该膜不仅可以抑制电解质分解，而且可以承受K +插入过程中较大的体积膨胀。与作为粘合剂的 PVDF 相比，基于 PVA 的石墨阳极可以运行超过 2000 个循环（在 C/3 下运行时间为 406 天），并且在 KPF 6基电解质中容量保持率为 97%。以PVA为粘结剂的石墨负极的初始库仑效率（ICE）高达81.6%，高于PVDF（40.1%）。受益于PVA强大的粘附能力，通过3D打印进一步构建石墨||氟磷酸钾离子全电池，在38 mg cm -的总质量负载下实现了8.9 mWh cm -2的创纪录面积能量 - 2 .这些结果证明了粘合剂在开发高性能 PIB 中的重要作用。
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