Study Shows Reactive Electrolytic Additives Improve Performance of Lithium Metal Batteries

Stable electrode-electrolyte interfaces constructed by ionic fluorine and nitrogen donor additives provide an opportunity to improve high performance lithium metal batteries

Combination of lithium difluorophosphate (bisoxalato) as F donor and lithium nitrate as N donor with different electron acceptability and adsorption tendencies improves cycle performance of complete Li cells | NCM811 through the creation of a double-layer SEI on a Li metal anode and a protective IEC on a cathode rich in Ni.

A research team has shown that electrolytic additives increase the life of lithium metal batteries and remarkably improve the performance of rapid charging and discharging. The team of Professor Nam-Soon Choi from the Department of Chemical and Biomolecular Engineering at KAIST prioritized the interphase of the solid electrolyte to create a double-layer structure and showed revolutionary run times for lithium metal batteries .

The team applied two electrolytic additives that have different reduction and adsorption properties to improve the functionality of the double-layer solid electrolyte interphase. Additionally, the team confirmed that the structural stability of the nickel-rich cathode was achieved through the formation of a thin protective layer on the cathode. This study was published in Energy Storage Materials.

Securing high energy density lithium metal batteries with long life and fast charging performance is vital to realize their ubiquitous use as superior power sources for electric vehicles. Lithium metal batteries include a lithium metal anode which provides 10 times the capacity of graphite anodes in lithium ion batteries. Therefore, lithium metal is an essential anode material for making high energy rechargeable batteries. However, unwanted reactions among electrolytes with lithium metal anodes can reduce power and this remains an obstacle to extending battery life. Previous studies have only focused on the formation of the solid electrolyte interphase on the surface of the lithium metal anode.

The team devised a way to create a double-layer solid electrolyte interphase to resolve the instability of the lithium metal anode using electrolytic additives, based on their electron acceptability and tendencies. adsorption. This hierarchical structure of solid electrolyte interphase on lithium metal anode has the potential to be further applied to lithium alloy anodes, lithium storage structures and anodeless technology to meet customer expectations. market in electrolyte technology.

The lithium metal anode and nickel rich cathode batteries accounted for 80.9% of the initial capacity after 600 cycles and achieved a high coulombic efficiency of 99.94%. These remarkable results have contributed to the development of a protective double-layer solid electrolyte interphase technology for lithium metal anodes.

Professor Choi said the research suggests a new direction for the development of electrolytic additives to regulate the unstable lithium metal anode-electrolyte interface, the biggest obstacle to lithium metal battery research.

She added that secondary anode-less battery technology is expected to be a game-changer in the secondary battery market and electrolytic additive technology will help improve secondary anode-less batteries through stabilization of lithium metal anodes.

This research was funded by the National Research Foundation’s Technology Development to Solve Climate Change Program in Korea funded by the Ministry of Science, ICT and Future Planning and the Technology Innovation Program funded by the Ministry of Commerce. , Industry and Energy and Hyundai Motor. Society.

– Publication

Saehun Kim, Sung O Park, Min-Young Lee, Jeong-A Lee, Imanuel Kristanto, Tae Kyung Lee, Daeyeon Hwang, Juyoung Kim, Tae-Ung ​​Wi, Hyun-Wook Lee, Sang Kyu Kwak and Nam

Soon Choi, “Stable Electrode-Electrolyte Interfaces Constructed by Fluorine and Nitrogen Donor Ion Additives for High Performance Lithium Metal Batteries”, Energy Storage Materials,

45, 1-13 (2022), (doi: https://doi.org/10.1016/j.ensm.2021.10.031)

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