期刊
ADVANCED MATERIALS
卷 33, 期 43, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202102964
关键词
electrolyte-electrode interfaces; fast charging high-voltage electrolytes; lithium-ion batteries; solvation structures
类别
资金
- National Natural Science Foundation of China [22122904, 21978281, 21975250, 11974150]
- National Key R&D Program of China [2017YFE0198100]
- Independent Research Project of the State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [110005R086]
- King Abdullah University of Science and Technology (KAUST)
- Hanyang University
- National Research Foundation of Korea [5199990414694] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
High-voltage lithium-ion batteries using high-voltage electrolytes can improve energy density and power density, but face challenges such as electrolyte decomposition and unclear interfacial side reactions. A new additive-free electrolyte has been developed to address these issues, providing stability at high voltage, lithium-dendrite-free features during fast charging, and superior performance at low temperatures. Additionally, a new solvation structure-related interfacial model has been introduced to help interpret battery performance and guide the design of versatile electrolytes for metal-ion batteries.
High-voltage lithium-ion batteries (LIBs) enabled by high-voltage electrolytes can effectively boost energy density and power density, which are critical requirements to achieve long travel distances, fast-charging, and reliable safety performance for electric vehicles. However, operating these batteries beyond the typical conditions of LIBs (4.3 V vs Li/Li+) leads to severe electrolyte decomposition, while interfacial side reactions remain elusive. These critical issues have become a bottleneck for developing electrolytes for applications in extreme conditions. Herein, an additive-free electrolyte is presented that affords high stability at high voltage (4.5 V vs Li/Li+), lithium-dendrite-free features upon fast-charging operations (e.g., 162 mAh g(-1) at 3 C), and superior long-term battery performance at low temperature. More importantly, a new solvation structure-related interfacial model is presented, incorporating molecular-scale interactions between the lithium-ion, anion, and solvents at the electrolyte-electrode interfaces to help interpret battery performance. This report is a pioneering study that explores the dynamic mutual-interaction interfacial behaviors on the lithium layered oxide cathode and graphite anode simultaneously in the battery. This interfacial model enables new insights into electrode performances that differ from the known solid electrolyte interphase approach to be revealed, and sets new guidelines for the design of versatile electrolytes for metal-ion batteries.
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