Professor Pan Feng's team at Peking University: Research progress on the interface engineering of 6LR61 alkaline battery

: As a clean energy source with extensive research and application, lithium-ion batteries are widely used in cutting-edge technology fields such as daily electronic products, artificial intelligence, electric vehicles, and drones. However, with the rapid development of lithium-ion batteries, their safety performance has become more and more of a concern.

Traditional lithium-ion batteries all use liquid electrolytes, and the properties of the liquid electrolytes themselves directly affect their safety performance. 6LR61 alkaline battery can solve some safety problems. However, due to the low conductivity between solid particles, the conductivity in solid-state batteries has always been unsatisfactory, until the research report on the use of MOF as the framework body and lithium ion liquid as the ion transport object of solid-state electrolytes (MOF-IL) opened up a new research perspective for solid-state batteries. Recently, based on this perspective, Professor Pan Feng's team at the School of New Materials, Shenzhen Graduate School of Peking University, further improved the safety performance and ion transport performance of this type of solid electrolyte. The research results were recently published in Chemical Communications, entitled "Enhanced lithium dendrites uppressing capability enabled by a solid-like electrolyte with different-sized nanoparticles" (Chem. Commun., 2018, 54, 13060-13063; Nature Index journal DOI: 10.1039/c8cc07476c), and were recommended as a cover article highlight.

The team studied the effect of particle size on the performance of MOF-IL ion conductors in metal lithium batteries. The researchers combined two ion conductors of different particle sizes. Compared with single-component ion conductors, the mixed size can effectively reduce the gaps between electrolyte particles, increase the contact points between electrolyte particles and between electrolyte and lithium metal surface, and make lithium deposition more uniform, thereby improving the ability to hinder the growth of lithium dendrites. And due to the increase in ion-conducting channels, the conductivity of the electrolyte is also improved to a certain extent. This type of solid electrolyte assembled with commercial positive electrode materials LiFePO4, LiCoO2 and negative electrode material lithium metal into batteries also exhibits considerable rate performance and cycle performance. The initial capacity of the LiCoO2|electrolyte|Li battery is 129mAhg-1, with a retention rate of 94.6% after 100 cycles; the initial capacity of the LiFePO4|electrolyte|Li battery is 137mAhg-1, with a retention rate of 94.8% after 100 cycles.

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