锂离子电池硅负极材料具有比容量高、电压平台低等优势, 粘结剂的结构和类型对硅负极的电化学储能性能具有较大影响。选取不同结构的粘结剂(聚丙烯酸、聚偏氟乙烯、羧甲基纤维素钠、聚丙烯酰胺)分别与硅/多孔石墨烯复合材料混合制浆涂布, 组装成锂离子半电池。在相同的电流密度下, 研究不同粘结剂对硅/多孔石墨烯复合负极材料的电化学储能影响。测试结果表明, 以聚丙烯酰胺作为粘结剂的硅/多孔石墨烯复合负极材料, 首次放电循环比容量为2623mAh/g, 初始库伦效率为84.4%, 循环100次后比容量仍保持为1462mAh/g。相较于其他粘结剂, 聚丙烯酰胺的三维交联网络结构具有较强的机械强度, 可以通过其共价网络结构来缓解Si负极体积膨胀造成的容量衰减现象。本研究可为锂离子电池硅复合负极材料粘结剂的选择和设计提供依据。
Silicon anode materials for lithium-ion batteries have the advantages of high specific capacity and low voltage plateau, and the structure and type of binders have a significant impact on the electrochemical energy storage performance of silicon anodes.In this paper, polyacrylic acid (PAA), polyvinylidene fluoride (PVDF), sodium carboxymethyl cellulose (CMC), and polyacrylamide (PAM) were selected and mixed with Si/pG composite, respectively, to prepare slurry coating for assembling lithium-ion half-cells.The effects of different binders on the electrochemical energy storage of Si/pG anode were studied under the same current density.The test results showed that for Si/pG-PAM anode, the specific capacity of the first discharge cycle was 2623mAh·g-1 with an initial Coulomb efficiency of 84.4%, and the specific capacity remained at 1462mAh·g-1 after 100 cycles.Compared with other binders, the 3D cross-linked network of PAM had strong mechanical strength, and its covalent network structure could alleviate the capacity decay caused by the volume expansion of the silicon anode.This study provided research bases for the design and selection of binder for Si composite anode for lithium-ion batteries.
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