Fabrication and performance of electrochemically grafted thiophene silicon nanoparticle anodes for Li-ion batteries

被引:5
作者
Abdelhamid, Muhammad E. [1 ,2 ]
Snook, Graeme A. [2 ]
Gaubicher, Joel [3 ]
Lestriez, Bernard [3 ]
Moreau, Philippe [3 ]
Guyomard, Dominique [3 ]
O'Mullane, Anthony P. [4 ]
机构
[1] RMIT Univ, Sch Appl Sci, GPO Box 2476V, Melbourne, Vic 3001, Australia
[2] CSIRO, Mineral Resources, Private Bag 10, Clayton, Vic 3169, Australia
[3] Univ Nantes, CNRS, Inst Mat Jean Rouxel IMN, 2 Rue Houssiniere,BP 32229, F-44322 Nantes 3, France
[4] Queensland Univ Technol, Sch Chem Phys & Mech Engn, GPO Box 2434, Brisbane, Qld 4001, Australia
基金
澳大利亚研究理事会;
关键词
Si nanoparticles; Grafting; Thiophene; Conducting polymer; Li-ion batteries; Si anodes; PROPYLENE CARBONATE SOLUTIONS; IMPEDANCE SPECTROSCOPY; RECHARGEABLE BATTERIES; NEGATIVE ELECTRODE; CYCLE LIFE; LITHIUM; ELECTROCATALYSIS; NANOWIRES; POLYMERS; INSIGHTS;
D O I
10.1016/j.jpowsour.2016.05.006
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, we developed thiophene-grafted Si nanoparticle anodes for Li-ion batteries. The surface of Si nanoparticles was chemically modified with thiophene molecules via an electrochemical grafting process. This study is an overture for future endeavours where the thiophene layer on the modified Si-nano particles will function as an anchor point when co-polymerised with conducting polymers to produce a chemically bonded Si/conducting polymer anode composite. This in principle should mitigate the loss of electrical connection with Si due to any structural breakdown that may occur during cell cycling. Furthermore, the effect of the thiophene layer on the capacity and the cyclability of the Si electrode was apparent where the new material retained similar to 39% of the starting capacity after 60 cycles, compared to the unmodified Si electrodes, that merely lasted for 10 cycles with only 4% capacity retention. This is due to the thiophene layers which create an artificial solid electrolyte interphase around the Si nanoparticles protecting them from degradation. Additionally, the viability of using conducting polymers as anode composites under charging/discharging conditions was investigated via electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) to conclude whether or not n-doping of the conducting polymer is required in such applications.
引用
收藏
页码:97 / 105
页数:9
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