Lithium-ion and solvent co-intercalation enhancing the energy density of fluorinated graphene cathode

IF 14 1区 化学 Q1 CHEMISTRY, APPLIED 能源化学 Pub Date : 2023-10-26 DOI:10.1016/j.jechem.2023.10.019
Hao Wang , Jie Jiang , Pengyu Chen , Zhenrui Wu , Xiaobin Niu , Chuying Ouyang , Jian Liu , Liping Wang
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Abstract

Fluorinated carbons CFx hold the highest theoretical energy density (e.g., 2180 W h kg−1 when x = 1) among all cathode materials of lithium primary batteries. However, the low conductivity and severe polarization limit it to achieve its theory. In this study, we design a new electrolyte, namely 1 M LiBF4 DMSO:DOL (1:9 vol.), achieving a high energy density in Li/CFx primary cells. The DMSO with a small molecular size and high donor number successfully solvates Li+ into a defined Li+-solvation structure. Such solvated Li+ can intercalate into the large-spacing carbon layers and achieve an improved capacity. Consequently, when discharged to 1.0 V, the CF1.12 cathode demonstrates a specific capacity of 1944 mA h g−1 with a specific energy density of 3793 W h kg−1. This strategy demonstrates that designing the electrolyte is powerful in improving the electrochemical performance of CFx cathode.

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锂离子与溶剂共插层提高了氟化石墨烯阴极的能量密度
在锂原电池正极材料中,氟化碳CFx的理论能量密度最高(x = 1时为2180 W h kg-1)。然而,低电导率和严重极化限制了其理论的实现。在这项研究中,我们设计了一种新的电解质,即1 M LiBF4 DMSO:DOL (1:9 vol.),在Li/CFx原电池中实现了高能量密度。具有小分子尺寸和高供体数的DMSO成功地将Li+溶剂化成明确的Li+溶剂化结构。这种溶剂化的Li+可以插入到大间距的碳层中,从而提高了容量。因此,当放电至1.0 V时,CF1.12阴极的比容量为1944 mA h g-1,比能量密度为3793 W h kg-1。这一策略表明,设计电解质对提高CFx阴极的电化学性能是强有力的。
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23.60
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