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Vinyl-Integrated In Situ Cross-Linked Composite Gel Electrolytes for Stable Lithium Metal Anodes
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-03-11 , DOI: 10.1021/acsaem.1c00327 Sungho Kim 1 , Jaegeon Ryu 1 , Jaehyun Rim 1 , Dongki Hong 2 , Jieun Kang 1 , Soojin Park 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-03-11 , DOI: 10.1021/acsaem.1c00327 Sungho Kim 1 , Jaegeon Ryu 1 , Jaehyun Rim 1 , Dongki Hong 2 , Jieun Kang 1 , Soojin Park 1
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Achieving high energy/power densities, longer operating cycles, and ensured battery safety of rechargeable batteries become the primary mission to satisfy the requirements of electrified applications. Lithium metal batteries (LMBs) have been spotlighted because of the potential high energy density with the high theoretical specific capacity (3860 mA h g–1) and low redox potential. However, a safety hazard and the resulting short cycle life of batteries from uncontrollable dendritic growth of Li during the electrochemical cycles are a deterrence to their their commercialization. Here, we report in situ formation of a covalent network of composite gel polymer electrolytes (CPEs) integrating the vinyl-functionalized silica (VSNP) with polymer structures. A small addition (1 wt %) of VSNP into the CPE greatly enhances the mechanical modulus and Li-ion transference number of the CPE while maintaining high ionic conductivity. The VSNP-CPE assembled LiCoO2/Li and Li(Ni0.8Co0.1Mn0.1)O2/Li metal batteries show durable battery operation with a capacity retention of 88% after 500 cycles and 80% after 200 cycles, respectively, compared to liquid electrolytes, which show a gradual decay. The functionalized nanofiller with in situ formed CPE provides a feasible platform to improve mechanical properties and ionic conduction of CPEs as well as the processability of fabrication of high energy density LMBs.
中文翻译：
用于稳定锂金属阳极的乙烯基集成原位交联复合凝胶电解质
实现高能量/功率密度，更长的运行周期以及确保可充电电池的电池安全性已成为满足电气化应用需求的主要任务。锂金属电池（LMB）备受关注，因为它具有潜在的高能量密度和较高的理论比容量（3860 mA hg –1）和低氧化还原电位。然而，安全隐患以及由于锂在电化学循环过程中无法控制的树枝状生长而导致的电池短循环寿命，阻碍了它们的商业化。在这里，我们报告原位形成的复合凝胶聚合物电解质（CPE）的共价网络集成了乙烯基官能化的二氧化硅（VSNP）与聚合物结构。在CPE中少量添加（1 wt％）VSNP可以大大提高CPE的机械模量和锂离子转移数，同时保持高离子电导率。VSNP-CPE组装LiCoO 2 / Li和Li（Ni 0.8 Co 0.1 Mn 0.1）O 2与液态电解质相比，/ Li金属电池显示出持久的电池运行性能，在500次循环后的容量保持率分别为88％，在200次循环后的容量保持率分别为80％。原位形成CPE的功能化纳米填料为改善CPE的机械性能和离子传导性以及制造高能量密度LMB的可加工性提供了可行的平台。
更新日期：2021-03-22
中文翻译：
用于稳定锂金属阳极的乙烯基集成原位交联复合凝胶电解质
实现高能量/功率密度，更长的运行周期以及确保可充电电池的电池安全性已成为满足电气化应用需求的主要任务。锂金属电池（LMB）备受关注，因为它具有潜在的高能量密度和较高的理论比容量（3860 mA hg –1）和低氧化还原电位。然而，安全隐患以及由于锂在电化学循环过程中无法控制的树枝状生长而导致的电池短循环寿命，阻碍了它们的商业化。在这里，我们报告原位形成的复合凝胶聚合物电解质（CPE）的共价网络集成了乙烯基官能化的二氧化硅（VSNP）与聚合物结构。在CPE中少量添加（1 wt％）VSNP可以大大提高CPE的机械模量和锂离子转移数，同时保持高离子电导率。VSNP-CPE组装LiCoO 2 / Li和Li（Ni 0.8 Co 0.1 Mn 0.1）O 2与液态电解质相比，/ Li金属电池显示出持久的电池运行性能，在500次循环后的容量保持率分别为88％，在200次循环后的容量保持率分别为80％。原位形成CPE的功能化纳米填料为改善CPE的机械性能和离子传导性以及制造高能量密度LMB的可加工性提供了可行的平台。
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