摘要
高比容量硅碳材料被认为是最具应用前景的锂离子电池负极材料,但充/放电过程中硅的体积膨胀效应导致电极材料易粉碎和脱落,易造成电池容量快速衰减,因此开发可靠的硅碳负极粘结剂来提高电池循环稳定性尤为重要。本文对生漆提取漆酚后的乙醇溶剂不溶性物质进行分离,得到了水溶性物质漆多糖(LPS),TG和DSC测试结果表明LPS的热稳定性良好。将LPS作为粘结剂用于硅碳电极组装锂离子半电池,测试硅碳电极的电化学性能。与商用的油性粘结剂聚偏氟乙烯(PVDF)和水性海藻酸钠(SA)对比发现:基于LPS的电池表现出良好的循环稳定性,200次充放电循环后比容量仍高达471.5mAh/g,远高于SA(387.7mAh/g)和PVDF(221.4mAh/g)。本工作可为开发天然产物基锂离子电池水性粘结剂提供理论基础,开拓生漆研究新亮点。
The high-capacity silicon/carbon material is widely regarded as the most potential electrode material for lithium-ion batteries.Nevertheless,the volumetric expansion of silicon during charge/discharge processes results in the fragmentation and detachment of electrode material,thereby inducing a rapid decline in battery capacity.Thus,the development of dependable silicon-carbon electrode binders is crucial for enhancing the cycling stability of batteries.In this article,the insoluble components of ethanol-extracted lacquer were separated,resulting in the water-soluble material known as lacquer polysaccharide(LPS).Thermal gravimetric analysis(TG)and differential scanning calorimetry(DSC)were conducted to assess the excellent thermal stability of lacquer polysaccharide.LPS was utilized as a binder for assembling lithiumion half-cells with silicon-carbon electrodes,and the electrochemical performance of these silicon-carbon electrodes was evaluated.Comparative studies with commercial binders,polyvinylidene fluoride(PVDF),and sodium alginate(SA),revealed that the batteries based on LPS exhibited outstanding cycling stability.Even after 200 charge-discharge cycles,the specific capacity remained as high as 471.5 mAh/g,significantly surpassing that of SA(387.7 mAh/g)and PVDF(221.4 mAh/g).This work provides a theoretical foundation for the development of natural product-based water-soluble binders for lithium-ion batteries,opening up new avenues in lacquer research.
作者
林凤采
毛海娟
陈相杨
陈基棚
郑笑笑
徐艳莲
LIN Feng-cai;MAO Hai-juan;CHEN Xiang-yang;CHEN Ji-peng;ZHENG Xiao-xiao;XU Yan-lian
出处
《中国生漆》
2023年第4期44-48,共5页
Journal of Chinese Lacquer
基金
国家自然科学基金(32301539,21978050),福建省自然科学基金(2023J011574,2022J05234)。
关键词
生漆
漆多糖
水性粘结剂
硅碳负极
Lacquer
Lacquer polysaccharide
Water-soluble binders
Silicon/carbon negative electrodes
