EB（丁酸乙酯）作为电解质的共溶剂调节超薄 CEI 膜以改善 LiNi0.8Co0.1Mn0.1O2 电池的超低温行为,ACS Sustainable Chemistry & Engineering

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EB（丁酸乙酯）作为电解质的共溶剂调节超薄 CEI 膜以改善 LiNi0.8Co0.1Mn0.1O2 电池的超低温行为
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-12-28 , DOI: 10.1021/acssuschemeng.3c07276
Lucheng Li ₁ , Weixia Lv ₁ , Jun Chen ₁ , Meiling Liu ₂ , Peng Yang ₁ , Qian Zhang _{1,

3} , Shengwen Zhong ₁

Affiliation

正如我们之前发表的工作中所记录的那样，在原始电解质中添加二氟磷酸锂可以在低温下实现出色的电化学性能；因此，为了能够获得更稳定的低温性能，在这项工作中，引入了一种线性羧酸盐助溶剂EB（丁酸乙酯），它具有低粘度（0.639 mPa s）、高离子电导率（5.18 mS cm ^–1 ) 和超低熔点 (−93 °C)。研究结果表明，-40℃时基础电解质的电导率和粘度分别为2.9 mS cm ^{–1和3.34 mPa s；}但在相同条件下比较，基线中添加16%EB后，电导率和粘度分别为3.37 mS cm ^–1和3.07 mPa s，其幅度变化表明电导率增加了16.2%，粘度下降了中期为 8%。因此，EB的添加可以明显提高电导率，同时大大降低电解液的粘度，进一步表明EB的添加有助于降低冷条件下锂离子传输过程中的电阻。此外，添加EB可以明显改善电池在寒冷条件下的电化学性能。此外，-40℃循环50次后，碱性电解液放电容量为81.94mAh g ^–1；相反，使用16 EB改性助剂的电池在相同条件下仍保持112.3 mAh g ^{–1的放电容量。}总体而言，含有EB的电芯在低温下表现优异，能够满足锂离子电池在凉爽环境下的使用。

"点击查看英文标题和摘要"

EB (Ethyl Butyrate) as a Cosolvent of Electrolyte Tuning an Ultrathin CEI Membrane for Improving the Ultralow-Temperature Behaviors of LiNi0.8Co0.1Mn0.1O2 Batteries

Adding lithium difluorophosphate into the original electrolyte results in outstanding eletrochemical performances among low temperatures, as documented in our earlier published work; therefore, to be able to gain more stability in low-temperature performances, in this work, a kind of linear carboxylate cosolvent, EB (ethyl butyrate), is introduced, which has low viscosity (0.639 mPa s), high ion conductivity (5.18 mS cm^–1), and ultralow melting point (−93 °C). The study’s results show that the basic electrolyte’s conductivity and viscosity are correspondingly 2.9 mS cm^–1 and 3.34 mPa s at −40 °C; however, comparing under the same condition, after adding 16% EB into the baseline, the conductivity and viscosity are 3.37 mS cm^–1 and 3.07 mPa s, whose amplitude changes show that the conductivity has increased by 16.2% and the viscosity has dropped by 8% in the interim. Therefore, the addition of EB can clearly boost conductivity, also drastically decreasing the electrolyte’s viscosity, further to signify that the addition of EB can contribute to the decrease in the resistance during lithium-ion transport in cold conditions. Besides, the electrochemical properties of the batteries during cold conditions can be obviously improved by adding EB. In addition, after 50 cycles of −40 °C, the basic electrolyte has a discharge capacity of 81.94 mAh g^–1; on the contrary, the cells using the 16 EB-modified coreagent maintains a discharge capacity of 112.3 mAh g^–1 under the same conditions. Overall, the cells containing EB perform exceptionally well at low temperatures and are capable of meeting the appliance of Li-ion batteries in a cool environment.

更新日期：2023-12-28

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