法拉第效率
电解质
阳极
溶剂化
化学工程
碳纤维
电池(电)
材料科学
吸附
二聚体
溶剂
电极
无机化学
化学
有机化学
物理化学
复合材料
热力学
工程类
复合数
功率(物理)
物理
作者
Siwei Zhao,Fuqiang Huang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-01-04
卷期号:18 (2): 1733-1743
被引量:11
标识
DOI:10.1021/acsnano.3c11171
摘要
The carbonaceous anodes in sodium ion batteries suffer from low initial Coulombic efficiency (ICE) and poor cyclability due to rampant solid electrolyte interface (SEI) growth. The concept of the weakly solvating electrolyte (WSE) has been popularized for SEI regulation on the anode by adjusting the cation solvation structure. Nevertheless, the effects on the solvation sheath from the electrode/electrolyte interface are ignored in most WSE applications. In this work, we extend the WSE from the bulk electrolyte to the electrolyte/carbon interface. By recycling asphalt wastes into sp2 C enriched few-layer carbon on hard carbon, a weakly solvating interface is fabricated with lower adsorption energy to electrolyte solvent molecules than a pristine anode (−0.89 vs −1.08 eV for Na/diglyme). Accordingly, more anionic groups are attracted into the solvent-weakened solvation sheath during sodiation (2.30 vs 1.96 coordination number for PF6–). The anion-mediated contact ion pairs facilitate a thin, inorganic-rich SEI layer with a homogeneous distribution, which confers a high ICE of 97.9% and a high capacity of 335.6 mA h g–1 at 1 C (89.5% retention, 1000 cycles). The full battery also manifests an energy density of 209 W h kg–1. This interfacial design is applicable in both ether- and ester-based electrolytes, which is promising in cost-effective modification for carbonaceous electrodes.
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