Sun Jianchao, Zou Yabing, Gao Shizhe, Shao Lianyi, Chen Chengcheng
School of Environment and Material Engineering, Yantai University, Yantai, 264005 Shandong, China.
China Electronic Product Reliability and Environmental Testing Research Institute (CEPREI), Guangzhou 510610, China.
ACS Appl Mater Interfaces. 2020 Dec 9;12(49):54711-54719. doi: 10.1021/acsami.0c16204. Epub 2020 Nov 20.
Magnesium ion batteries (MIBs) have attracted a lot of attention because of the natural abundance of magnesium, high volumetric energy density, and superior safety. Nevertheless, MIBs are still in their infancy because of the significant challenge in developing a suitable electrolyte with low flammability, high ionic conductivity, and compatibility with the Mg anode. Herein, we construct rechargeable quasi-solid-state MIBs based on tailored polymer electrolytes. The quasi-solid state electrolyte of poly(vinylidene fluoride--hexafluoropropylene)-nanosized SiO-Mg(TFSI) combines the outstanding dynamic property of a liquid electrolyte and the good stability of a solid-state electrolyte. It exhibits a highly reversible Mg deposition-dissolution capability, high ion conductivity (0.83 mS cm), and superior compatibility with the Mg metal and cathode. The quasi-solid-state MIBs with a layered titanic oxide cathode show a high reversible capacity of 129 mA h g at 50 mA g (150 W h kg) without any decay after 100 cycles.
镁离子电池（MIBs）因其镁资源丰富、体积能量密度高以及安全性优越而备受关注。然而，由于在开发具有低可燃性、高离子电导率且与镁负极兼容的合适电解质方面面临重大挑战，MIBs仍处于起步阶段。在此，我们基于定制的聚合物电解质构建了可充电准固态MIBs。聚（偏二氟乙烯 - 六氟丙烯）-纳米二氧化硅 - 双三氟甲磺酰亚胺镁的准固态电解质结合了液体电解质出色的动力学性能和固态电解质良好的稳定性。它展现出高度可逆的镁沉积 - 溶解能力、高离子电导率（0.83 mS cm）以及与镁金属和正极的优异兼容性。具有层状氧化钛正极的准固态MIBs在50 mA g（150 W h kg）时显示出129 mA h g的高可逆容量，100次循环后无任何衰减。
