水溶性羧甲基纤维素钠基粘结剂在硅负极中的性能研究
孙兴燊 , 徐晶 , 饶瑞晔 , 赵升云 , 蒋建新 , 刘鹤 , 宋湛谦
现代化工 ›› 2025, Vol. 45 ›› Issue (S1) : 273 -280.
水溶性羧甲基纤维素钠基粘结剂在硅负极中的性能研究
Performance of water-soluble carboxymethyl cellulose sodium based binder in silicon anode
为应对锂离子电池硅电极体积膨胀的挑战,使用羧甲基纤维素钠(CMC-Na)、植酸(PA)和钙离子(Ca2+)合成了水溶性交联粘结剂(C-PA-Ca2+)。CMC-Na和PA中的极性官能团为氢键和共价键的形成提供了丰富的结合位点,氢键和共价键的形成增强了粘结剂的机械性能,再通过Ca2+修饰牢固了整个粘结剂体系。研究了交联型粘结剂 C-PA-Ca2+的电化学性能,结果表明,采用C-PA-Ca2+作硅电极粘结剂时,平均剥离力为2.39 N,优于粘结剂CMC-Na的 1.47 N和C-PA的2.07 N;在0.2 C电流密度下循环200圈,电极Si@C-PA-Ca2+的比容量为2 035.2 mAh/g,优于对比电极 Si@CMC-Na的844.8 mAh/g和Si@C-PA的1 566.1 mAh/g;此外,在0.5 C条件下Si@C-PA-Ca2+电极表现出优异的循环稳定性能,循环300圈后比容量为1 879.7 mAh/g,容量保持率为70.85%,每圈容量损失仅0.097%。C-PA-Ca2+有望成为一种性能优异的新型水溶性硅负极粘结剂。
To address the notable challenge of volume expansion of silicon electrodes in lithium-ion batteries,a water-soluble cross-linking binder (C-PA-Ca2+) is synthesized from carboxymethyl cellulose sodium (CMC-Na),phytic acid (PA),and calcium ions (Ca2+).CMC-Na and PA possess numerous polar functional groups that offer ample binding sites for the creation of hydrogen bonds and covalent bonds,which enhance the mechanical properties of the binder.The overall strength of the binder system isfurther improvedby Ca2+ modification.Compared with CMC-Na and C-PA binders,the electrochemical properties of cross-linked C-PA-Ca2+ binder are studied.It is found that the average peel force reaches 2.39 N when C-PA-Ca2+ is used as the binder for Si electrode,which is superior to the 1.47 N of CMC-Na binder and the 2.07 N of C-PA binder.After 200 cycles at 0.2 C,the charging specific capacity of Si@C-PA-Ca2+ electrode is 2 035.2 mAh·g-1,higher than the 844.8 mAh·g-1 of Si@CMC-Na comparison electrode and the 1 566.1 mAh·g-1 of Si@C-PA comparison electrode.Moreover,after 300 cycles at 0.5 C,Si@C-PA-Ca2+ exhibits an excellent cyclic stability performance,with a specific capacity of 1 879.7 mAh·g-1,a capacity retention rate of 70.85%,and a capacity loss of 0.097% per cycle only.C-PA-Ca2+ binder displays the potential to become a novel water-soluble Si electrode binder with excellent performance.
lithium-ion batteries / binder / carboxymethyl cellulose sodium / Si anode
| [1] |
|
| [2] |
|
| [3] |
|
| [4] |
|
| [5] |
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
| [19] |
|
| [20] |
|
| [21] |
|
| [22] |
|
| [23] |
|
| [24] |
|
| [25] |
|
| [26] |
|
| [27] |
|
| [28] |
|
| [29] |
|
| [30] |
|
| [31] |
|
福建省科技创新重点项目(2021G02014)
南平市科技特派员资源产业科技创新联合资助项目(N2024Z003)
福建省自然科学基金(2022J05265)
福建省自然科学基金(2024J01919)
/
| 〈 |
|
〉 |