电解质
阳极
金属锂
阴极
锂(药物)
石墨
溶剂
离子
电化学
化学
金属
无机化学
材料科学
化学工程
电极
有机化学
物理化学
内分泌学
工程类
医学
作者
Chengtian Zhou,Yixuan Guo,Bowen Chen,Subhajit Sarkar,Venkataraman Thangadurai
标识
DOI:10.1016/j.electacta.2023.142628
摘要
Localized high concentrations electrolyte (LHCE) has garnered significant attention as an emerging electrolyte candidate for Li-metal batteries. LHCE is formed by diluting a high concentration electrolyte (usually close to saturation) with a non-solvating solvent that has a low donor number. We propose a modified concept of LHCE, called "localized electrolyte (LE)," optimized for Li-ion batteries with a graphite anode and Ni-rich cathode. In LE, the Li salt concentration is optimized to be only 1-2 M in solvating solvents, resulting in an overall concentration of 0.5–1 M, which reduces cost and supports fast ion transport. The non-flammable LE also has excellent wettability, which facilitates fasting charging. We also demonstrated that with the addition of 2 wt.% vinylene carbonate into 0.7 M LE, the Li-ion cell retains 80.3% of its initial capacity after 700 cycles of testing in about 4 months. Overall, LE represents a promising and cost-effective solution for improving the performance and safety of Li-ion batteries.
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