阳极
材料科学
法拉第效率
电解质
锂(药物)
电极
电池(电)
化学工程
分解
降级(电信)
计算机科学
化学
有机化学
工程类
内分泌学
物理化学
功率(物理)
物理
电信
医学
量子力学
作者
Kaijia Duan,Jingrong Ning,Liqun Zhou,Shiquan Wang,Qin Wang,Jianwen Liu,Zaiping Guo
标识
DOI:10.1021/acsami.1c24808
摘要
Severe electrolyte decomposition under high voltage can easily lead to degradation of the performance of lithium-ion batteries, which has become a major obstacle to the practical application of high-energy-density batteries. To solve these problems, a dual-functional electrolyte additive comprising inorganic lithium difluorophosphate (LiDFP) and organic 1,3,6-hexanetrinitrile (HTN) was designed and employed to improve the performance of high-voltage Si@C/LiNi0.5Mn1.5O4 full batteries. LiDFP with a lower LUMO energy than the solvent in the electrolyte takes priority in reduction, facilitating the formation of a dense and stable film on the anode, effectively suppressing side reactions of the electrolyte and aiding tolerance to the volume expansion of the Si@C electrode. Additionally, the lower HOMO energy of HTN can improve the oxidation resistance of the electrolyte, with the C≡N functional group of HTN helping to remove the trace water and the byproduct HF from the electrolyte. The Si@C/LiNi0.5Mn1.5O4 full battery with 1 wt % LiDFP and 1 wt % HTN in 1.0 M LiPF6 traditional electrolyte delivers high capacity retention of 91.57% after 150 cycles at 0.2C, compared to 34.58% capacity retention without any additives. Moreover, the Coulombic efficiency of batteries with electrolyte additives can reach 99.75% on average, compared to their counterparts at ∼96.54%. The synergistic effect of LiDFP and HTN provides a promising strategy for enhancing the performance of high-voltage batteries for practical industrialization.
科研通智能强力驱动
Strongly Powered by AbleSci AI