壳聚糖基自交联粘结剂的合成及其在硅碳负极中的研究

Synthesis of a Self-Crosslinking Binder Based on Chitosan and Its Electrochemical Performance in a Silicon-Carbon Anode

首先以壳聚糖为起始原料,通过羧甲基化处理,显著提升了其水溶性。随后,利用LiOH进行预锂化,并引入双丙酮丙烯酰胺(DAAM)和乙二酸二酰肼(ADH),成功制备了具有出色自交联性能的粘结剂CDD-Li^(+)。为了探究这一粘结剂的结构特性,采用了傅里叶变换红外光谱(FT-IR)技术进行了表征。在粘附性方面,通过180°剥离实验,验证了CDD-Li^(+)的强粘附能力。利用电化学工作站对电池进行了循环伏安曲线的测试。结果显示,CDD-Li^(+)粘结剂所制备的电池能够发生高效的电化学反应,展现出卓越的电化学性能。与常用的聚丙烯酸(PAA)粘结剂相比,CDD-Li^(+)粘结剂在电化学性能上表现更为出色,展现出其在电池领域上的巨大潜力。通过蓝电电池测试仪,进一步研究了电池的倍率性能、循环性能以及锂离子扩散系数,并计算了电池的首圈库伦效率(ICE)。结果显示,CDD-Li^(+)粘结剂制备的电池不仅拥有更优的倍率性能和循环性能,其锂离子扩散系数平均高达10-10数量级,ICE也高达95%。与PAA粘结剂相比,CDD-Li^(+)粘结剂在硅碳负极中展现出更优秀的性能。

Chitosan was used as the starting material and its water solubility was significantly enhanced by carboxymethylation.Subsequently,LiOH was introduced for pre-lithiation,and bisacetone acrylamide(DAAM)and acetate dihydrazide(ADH)were added to successfully prepare the binder CDD-Li^(+)with excellent self-crosslinking properties.In order to explore the structural properties of this binder,Fourier transform infrared spectroscopy(FT-IR)technique was used for characterization.In terms of adhesion,the strong adhesion ability of CDD-Li^(+)was verified by 180°stripping experiments.The cyclic voltammetry curves of the batteries were tested using an electrochemical workstation,and the results showed that the batteries prepared with the CDD-Li^(+)binder were able to undergo highly efficient electrochemical reactions and exhibited excellent electrochemical performance.Compared with the PAA binder,the CDD-Li^(+)binder has a better performance in electrochemical performance.Using the blue battery tester,we further investigated the multiplication performance,cycling performance,and lithium ion diffusion coefficient of the battery,and calculated the initial coulombic efficiency of the battery.The results show that the batteries prepared with CDD-Li^(+)binder not only have better multiplication and cycling performance,but also have an average Li-ion diffusion coefficient as high as 10-10 orders of magnitude and a ICE as high as 95%.Compared with PAA binder,CDD-Li^(+)binder shows better performance in silicon carbon anode.