TTFEB作为锂离子电池Si负极电解液添加剂的研究
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- 英文论文题名：TTFEB as an electrolyte additive to improve performance of silicon anode for lithium-ion batteries
- 论文作者：马玉林 ; 周振心 ; 杨子涵 ; 郭佳威 ; 尹鸽平
- 英文论文作者：Yulin Ma ; Zhenxin Zhou ; Zihan Yang ; Jiawei Guo ; Gepin Yin ; Institute of Advanced Chemical Power Sources ; School of Chemical Engineering and Technology ; Harbin Institute of Technology
- 年：2016
- 作者机构：哈尔滨工业大学特种化学电源研究所;
- 论文关键词：锂离子电池 ; 硅负极 ; 电解液添加剂
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TM912;O646
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：325k
- 原文格式：D
- 会议级别：全国
摘要
锂离子电池由于具有高比能量、无记忆效应、循环寿命长等优点已经逐渐应用于电动车领域,但是该领域的发展迫使电池不断提高能量密度,这就需要发展高比容量的电极材料。硅基负极材料具有极高的理论比容量(4200mAh/g)近年来备受人们的关注,然而较低的首次效率,尤其是材料在脱嵌锂过程中不断的收缩膨胀造成颗粒的破碎,导致循环过程容量的不断下降。同时,硅负极上不稳定的SEI膜在循环过程中逐渐增厚,极化增大,且造成较大的机械应力,使电极结构进一步破坏。~(1-2)本研究提出了一种新的硼基阴离子受体TTFEB作为电解液添加剂改善硅负极的循环稳定性。电化学测试结果表明,在TTFEB在1.8 V(vs Li/Li~+)在硅负极表面还原分解,优先于传统电解液,TTFEB的加入使纳米硅电极的循环性能和库仑效率显著地提高。通过SEM及XPS等结果分析推测TTFEB优先分解,在Si颗粒表面原位形成保护膜,提高SEI膜的稳定性,抑制电极的结构变化,从而提高硅负极电化学性能。
Silicon anode is a hotspot in the field of anode materials for lithium-ion battery owing to its excellent theoretical capacity.However,this material suffer serious volume expansion and contraction during lithium intercalation/deintercalation,which will cause cracking and pulverization of Si particle.Moreover,the poor stability of SEI film on the Si anode leads to thick SEI film and increasing of the electrode polarization.Ultimately,these problems result in rapid capacity fading of the Si anode.Here,we proposes a new boron-based anion receptor,TTFEB,as an electrolyte additive for silicon-based electrodes.The electrochemical studies demonstrate the cycling performance and columbic efficiency of nano silicon is improved significantly with the adoption of TTFEB.This remarkable electrochemical performance promoting can be explained by the in-situ formed artificial protective film derived from the reduction of TTFEB.
Silicon anode is a hotspot in the field of anode materials for lithium-ion battery owing to its excellent theoretical capacity.However,this material suffer serious volume expansion and contraction during lithium intercalation/deintercalation,which will cause cracking and pulverization of Si particle.Moreover,the poor stability of SEI film on the Si anode leads to thick SEI film and increasing of the electrode polarization.Ultimately,these problems result in rapid capacity fading of the Si anode.Here,we proposes a new boron-based anion receptor,TTFEB,as an electrolyte additive for silicon-based electrodes.The electrochemical studies demonstrate the cycling performance and columbic efficiency of nano silicon is improved significantly with the adoption of TTFEB.This remarkable electrochemical performance promoting can be explained by the in-situ formed artificial protective film derived from the reduction of TTFEB.
引文
[1]C.K.Chan,H.Peng,G.Liu,K.Mcllwrath,Nat.Nanotechnol.2008,3:31.
[2]S.Goriparti,E.Miele,F.De Angelis,E.Di Fabrizio,J.Power Sources 2014,257:421.
[2]S.Goriparti,E.Miele,F.De Angelis,E.Di Fabrizio,J.Power Sources 2014,257:421.