报告题目：AI Enabled High-Performance Li-S Battery Design: Material Innovations and Reevaluating the Role of LiPSs
报 告 人：高鑫
报告时间：2025年3月27日（星期四）10:00—11:30
报告地点：广州市黄埔区中新知识城纳米谷二期5号楼
广州市黄埔区华工纸基材料创新研究院5层529会议室
主办单位：轻工科学与工程学院
造纸与污染控制国家工程研究中心
先进纸基材料技术创新中心
报告摘要：
Lithium-sulfur (Li-S) batteries with high energy density and low cost are promising for next-generation energy storage. However, their cycling stability is plagued by the high solubility of lithium polysulfide (LiPS) intermediates, causing fast capacity decay and severe self-discharge. Exploring electrolytes with low LiPS solubility has shown promising results toward addressing these challenges. However, here, we report that electrolytes with moderate LiPS solubility are more effective for simultaneously limiting the shuttling effect and achieving good Li-S reaction kinetics. We explored a range of solubility from 37 to 1,100 mM (based on S atom, [S]) and found that a moderate solubility from 50 to 200 mM [S] performed the best. Using a series of electrolyte solvents with various degrees of fluorination, we formulated the Single-Solvent, Single-Salt, Standard Salt concentration with Moderate LiPSs solubility Electrolytes (termed S6MILE) for Li-S batteries.Among the designed electrolytes,Li-S cells using fuorinated-1,4-dimethoxybutane S6MILE gave the highest capacity of 1,526 mAh g-1 at 0.05 C and an average CE of 99.89% for 150 cycles at 0.2 C under lean electrolyte conditions.Moreover,we observed a long calendar aging life, with a capacity increase/recovery of 4.3% after resting for 30 d. Furthermore, the correlation between LiPS solubility,degree of fluorination of the electrolyte solvent,and battery performance was systematically investigated.
报告人简介：
高鑫，北京大学助理教授/研究员，博士生导师。高鑫博士毕业于北京大学化学与分子工程学院（导师：张锦院士），2019—2023年在美国斯坦福大学材料系从事博士后研究（合作导师：Prof.Yi Cui），2023年加入北京大学材料科学与工程学院。课题组围绕新型纳米材料的结构（低维纳米碳材料、亚稳纳米材料、多级纳米结构、核壳结构）控制制备与能源化学开展创新性研究。主要研究方向包括：1.烯碳纤维材料的控制制备与电磁防护性能研究；2.新型碳材料石墨炔的控制制备与应用探索；3.高能量密度二次电池的设计与开发。迄今，已发表SCI论文50余篇，其中以第一/通讯作者在 Nature Nanotechnology,Science Advances,Nature Communications,PNAS,Journal of the American Chemical Society,Advanced Materials,Nano Letters, Chemical Society Review等期刊发表论文20余篇，SCI高被引论文5篇。出版学术专著《石墨双炔薄膜的合成方法与应用探索》。主持JWKJW重点项目、国家自然科学基金青年科学基金项目和CTL重点实验室专项等科研项目。