文献类型：期刊文献

英文题名：Comprehensive Understanding of High Polar Polyacrylonitrile as an Effective Binder for Li-Ion Battery Nano-Si Anodes

作者：Luo, Lei[1];Xu, Yunlong[1];Zhang, Huang[2,3];Han, Xiaona[1];Dong, Hui[1];Xu, Xing[1];Chen, Chao[1];Zhang, Yang[1];Lin, Jiahao[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Helmholtz Inst Ulm, Helmholtzstr 11, D-89081 Ulm, Germany;[3]Karlsruhe Inst Technol, POB 3640, D-76021 Karlsruhe, Germany

年份：2016

卷号：8

期号：12

起止页码：8154

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20161602265355);WOS:【SCI-EXPANDED(收录号:WOS:000373519500063)】；

基金：This work is supported by Shanghai Leading Academic Discipline Project (B502) and Shanghai Key Laboratory Project (08DZ2230500). Partial financial support from the Chinese State Scholarship Fund (No. 201408310121) is gratefully acknowledged.

语种：英文

外文关键词：polyacrylonitrile; binder; nano-Si; anode; Li-ion battery

摘要：Well-defined polyacrylonitriles (PANs) with different molecular weights were synthesized through an activator regenerated by electron transfer atom-transfer radical polymerization method and employed as binders in silicon negative electrode for lithium-ion batteries. Compared with poly(vinylidene fluoride) and carboxyl methyl cellulose as binders, the electrode performance of PANs is well-improved. Specifically, at 100 mA from 0.01 to 1.5 V, the initial discharge capacity of PAN100-based electrode is 4147.8 mA h g(-1) and still remains about 1639.6 mA h g(-1) over 50 cycles. A comprehensive understanding on the improvement mechanism is preliminarily discussed. The results indicate that the superior performance largely depends on the higher lithium ion diffusion efficiency in PAN which results from the weak interaction between lithium ions and PAN polymer chain, and the hydrogen bonds among the nitrile group (C N) of PAN, Si nanoparticles, and the current collector, which will lead to an efficient coating of PAN with the Si particles and well-improved adhesion strength, synergistically depressing the structural deterioration of silicon electrodes.