基于海藻酸镁水性黏结剂的高性能硅基锂离子电池  

High Performance Silicon-based Lithium-ion Battery Using Water-borne Magnesium Alginate as Binder

作　　者：张毅[1,2] 杜栓丽[1] 程亚军[2] 

机构地区：[1]中北大学化工与环境学院,太原030000 [2]中国科学院宁波材料技术与工程研究所,宁波315201

出　　处：《材料导报》2016年第10期19-22,50,共5页Materials Reports

基　　金：国家自然科学基金(51103172)

摘　　要：黏结剂对于硅基锂离子电池性能起着至关重要的作用。提出采用水性、二价多糖化合物海藻酸镁作为黏结剂,提高硅负极锂电性能的思想。研究工作显示,相比常用的羧甲基纤维素钠黏结剂,采用海藻酸镁黏结剂的硅基锂离子电池具有更好的循环性能,在较高电流密度下具有更高的可逆充放电比容量。200mA/g电流密度下,100次循环后容量仍保持在1500mAh/g左右。在1000mA/g电流密度下,可逆比容量仍然有大约1300mA/g。海藻酸镁黏结剂对于硅负极锂离子电池性能的改善作用可能与二价镁离子对海藻酸盐能够诱导起到交联作用,从而增强其对于硅纳米粒子的黏结有关。研究成果显示海藻酸镁有希望成为一种新型高性能水性硅基锂离子电池黏结剂。Binder is a key component for high performance silicon based lithium-ion battery.This work proposed an idea of using water-borne magnesium alginate as binder to improve the electrochemical performance of the silicon anode.The experiment observed that magnesium alginate binder significantly improved the cyclic stability and rate performance of the silicon-based lithium-ion battery,compared to the conventional sodium carboxymethyl cellulose binder.After 100 cycles at a current density of 200 mA/g,reversible capacity of around 1500 mAh/g was still retained,and under 1000mA/g the lithium-ion battery still exhibited a reversible capacity of around 1300mAh/g.The good binding performance of the magnesium alginate may originate from the potential cross-linking effect induced by Mg2＋ions.The results indicated that magnesium alginate is expected to become a new promising binder for siliconbased lithium-ion battery.

关 键 词：水性黏结剂 海藻酸镁 锂离子电池 硅纳米粒子 电化学性能 

分 类 号：TB34[一般工业技术—材料科学与工程] O69[理学—化学]