کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1288201 | 1498004 | 2013 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effects of nonaqueous electrolyte solutions mixed with carbonate-modified siloxane on charge–discharge performance of negative electrodes for secondary lithium batteries Effects of nonaqueous electrolyte solutions mixed with carbonate-modified siloxane on charge–discharge performance of negative electrodes for secondary lithium batteries](/preview/png/1288201.png)
Influence of mixing carbonate-modified siloxane into 1 M (M: mol L−1) LiPF6-ethylene carbonate (EC)/ethylmethyl carbonate (EMC) (mixing volume ratio = 3:7) mixed solvent electrolytes on charge–discharge cycling properties of lithium is examined. As siloxane, 4-(2-bis(trimethylsilyloxy)methylsilylethyl)-1,3-dioxolan-2-one is investigated. Charge–discharge cycling efficiencies of lithium metal anodes are improved and impedance of anode/electrolyte interface decreases by mixing siloxane, compared with those in 1 M LiPF6-EC/EMC alone. Mechanism of enhancement of lithium cycling efficiency is considered to be due to the suppression of excess reduction of LiPF6-EC/EMC by lithium and growth of surface film (SEI, solid electrolyte interphase) on lithium. Infrared study indicates that SEI formed in LiPF6-EC/EMC with siloxane contains more inorganic compounds than that in LiPF6-EC/EMC alone. Better cycling behavior of α-Fe2O3 and Si–SiO2–carbon composite anodes is obtained by mixing siloxane. Thermal behavior of electrolyte solutions toward graphite-lithium anodes is evaluated with a differential scanning calorimeter. Heat-output of graphite–lithium anodes with 1 M LiPF6-EC/EMC electrolyte solutions tends to decrease by mixing siloxane.
► Carbonate modified siloxane mixed with 1 M LiPF6-EC/EMC are prepared.
► Cycling efficiencies of Li, Si–SiO2–carbon composite and Fe2O3 anodes are improved.
► Siloxane suppresses excess reduction of LiPF6-EC/EMC by lithium.
► Model of interface between anode and electrolyte is proposed.
Journal: Journal of Power Sources - Volume 228, 15 April 2013, Pages 32–38