摘要
近年来,Si/C负极在商业领域取得了很大的成果,但其低温性能仍有改进的空间。提出了一种新型添加剂,即1-乙基-3-甲基咪唑硫酸乙酯(EMIM),能够显著提高Si/C负极的低温性能。研究结果表明,添加3%EMIM的纽扣电池在室温条件下循环100次仍有78.9%的容量保持率,并且在低温条件下(-20℃)循环150次仍有76.05%的容量保持率。此外,交流阻抗法(EIS)、循环伏安法(CV)和扫描电子显微镜(SEM)等表征均表明使用含有EMIM电解质形成的SEI拥有较低的界面阻抗,并且具有优异的机械性能。该结果提供了一种简单的方法提高Si/C负极的低温性能,并证明了可以在寒冷气候下运行的商业锂离子电池的方法。
In recent years,Si/C anodes have achieved considerable commercial success.However,there is further potential for enhancement of their low-temperature performance.In this work,we proposed a novel additive,ethyl 1-ethyl-3-methylimidazole sulfate(EMIM),which can significantly improve the low-temperature performance of Si/C anode.The study results show that the coin cell containing 3% EMIM exhibits a capacity retention of 78.9% after 100 cycles at room-temperature and 76.05% after 150 cycles at low-temperature(-20℃).In addition,characterizations such as electrochemical impedance spectroscopy(EIS),cyclic voltammetry(CV),and scanning electron microscopy(SEM)all indicate that a SEI formed using an electrolyte containing EMIM exhibits lower interfacial impedance and excellent mechanical properties.These results provide a simple way to improve the low-temperature performance of Si/C anodes and validate a method for commercial lithium-ion batteries that can operate in cold environments.
作者
景克旋
丁正平
梁康
李建斌
任玉荣
JING Kexuan;DING Zhengping;LIANG Kang;LI Jianbin;REN Yurong(School of Materials Science&Engineering,Changzhou University,Changzhou Jiangsu 213164,China)
出处
《电源技术》
北大核心
2025年第8期1598-1605,共8页
Chinese Journal of Power Sources
基金
国家自然科学基金(U22A20420,52203291)。
作者简介
景克旋(1998-),男,河南省人,硕士,主要研究方向为锂离子电池Si/C负极添加剂;通信作者:任玉荣,E-mail:ryrchem@cczu.edu.cn。
