高等学校化学学报
高等學校化學學報
고등학교화학학보
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES
2014年
8期
1771-1781
,共11页
刘成勇%张恒%郑丽萍%徐飞%冯文芳%聂进%黄学杰%周志彬
劉成勇%張恆%鄭麗萍%徐飛%馮文芳%聶進%黃學傑%週誌彬
류성용%장항%정려평%서비%풍문방%섭진%황학걸%주지빈
锂离子电池%非水电解液%(三氟甲基磺酰) (三氟乙氧基磺酰)亚胺锂%Al箔腐蚀
鋰離子電池%非水電解液%(三氟甲基磺酰) (三氟乙氧基磺酰)亞胺鋰%Al箔腐蝕
리리자전지%비수전해액%(삼불갑기광선) (삼불을양기광선)아알리%Al박부식
Lithium-ion battery%Nonaqueous electrolyte%Lithium( trifluoromethanesulfonyl) ( trifluoroethoxy-sulfonyl) imide{Li[ TFO-TFSI]}%Al foil corrosion
制备了一种新型含氟磺酰亚胺锂盐(三氟甲基磺酰)(三氟乙氧基磺酰)亚胺锂{Li[( CF3 SO2)·(CF3CH2OSO2)N], Li[TFO-TFSI]}及其与碳酸乙烯酯(EC)/碳酸甲乙酯(EMC)混合溶剂(3:7,体积比)组成的非水电解液.采用核磁共振波谱( NMR)、红外光谱( IR)、质谱( MS)、元素分析( EA)和离子色谱( IC)等手段对合成锂盐Li[ TFO-TFSI]进行了结构表征及纯度分析.通过差示量热扫描( DSC)和热重分析( TG)对Li[TFO-TFSI]及其电解液1.0 mol/L Li[TFO-TFSI]-EC/EMC(3:7)的热学性质进行了表征.采用交流阻抗( EIS)、循环伏安( CV)、计时安培法及扫描电子显微镜( SEM)等对Li[ TFO-TFSI]/碳酸酯电解液的基础物化和电化学性质进行了表征.结果表明, Li[ TFO-TFSI]/碳酸酯电解液具有较好的电化学稳定性;在4.2 V( vs. Li/Li+)以下Al箔不发生腐蚀;室温下基于Li[ TFO-TFSI]/碳酸酯电解液的Li/人造石墨和人造石墨/LiCoO2电池均保持较好的循环性能,特别是人造石墨/LiCoO2锂离子电池循环100周后,其比容量保持率明显高于相应的基于LiPF6/碳酸酯电解液体系的电池.
製備瞭一種新型含氟磺酰亞胺鋰鹽(三氟甲基磺酰)(三氟乙氧基磺酰)亞胺鋰{Li[( CF3 SO2)·(CF3CH2OSO2)N], Li[TFO-TFSI]}及其與碳痠乙烯酯(EC)/碳痠甲乙酯(EMC)混閤溶劑(3:7,體積比)組成的非水電解液.採用覈磁共振波譜( NMR)、紅外光譜( IR)、質譜( MS)、元素分析( EA)和離子色譜( IC)等手段對閤成鋰鹽Li[ TFO-TFSI]進行瞭結構錶徵及純度分析.通過差示量熱掃描( DSC)和熱重分析( TG)對Li[TFO-TFSI]及其電解液1.0 mol/L Li[TFO-TFSI]-EC/EMC(3:7)的熱學性質進行瞭錶徵.採用交流阻抗( EIS)、循環伏安( CV)、計時安培法及掃描電子顯微鏡( SEM)等對Li[ TFO-TFSI]/碳痠酯電解液的基礎物化和電化學性質進行瞭錶徵.結果錶明, Li[ TFO-TFSI]/碳痠酯電解液具有較好的電化學穩定性;在4.2 V( vs. Li/Li+)以下Al箔不髮生腐蝕;室溫下基于Li[ TFO-TFSI]/碳痠酯電解液的Li/人造石墨和人造石墨/LiCoO2電池均保持較好的循環性能,特彆是人造石墨/LiCoO2鋰離子電池循環100週後,其比容量保持率明顯高于相應的基于LiPF6/碳痠酯電解液體繫的電池.
제비료일충신형함불광선아알리염(삼불갑기광선)(삼불을양기광선)아알리{Li[( CF3 SO2)·(CF3CH2OSO2)N], Li[TFO-TFSI]}급기여탄산을희지(EC)/탄산갑을지(EMC)혼합용제(3:7,체적비)조성적비수전해액.채용핵자공진파보( NMR)、홍외광보( IR)、질보( MS)、원소분석( EA)화리자색보( IC)등수단대합성리염Li[ TFO-TFSI]진행료결구표정급순도분석.통과차시량열소묘( DSC)화열중분석( TG)대Li[TFO-TFSI]급기전해액1.0 mol/L Li[TFO-TFSI]-EC/EMC(3:7)적열학성질진행료표정.채용교류조항( EIS)、순배복안( CV)、계시안배법급소묘전자현미경( SEM)등대Li[ TFO-TFSI]/탄산지전해액적기출물화화전화학성질진행료표정.결과표명, Li[ TFO-TFSI]/탄산지전해액구유교호적전화학은정성;재4.2 V( vs. Li/Li+)이하Al박불발생부식;실온하기우Li[ TFO-TFSI]/탄산지전해액적Li/인조석묵화인조석묵/LiCoO2전지균보지교호적순배성능,특별시인조석묵/LiCoO2리리자전지순배100주후,기비용량보지솔명현고우상응적기우LiPF6/탄산지전해액체계적전지.
A novel lithium salt, lithium( trifluoromethanesulfonyl) ( trifluoroethoxysulfonyl) imide{Li[ ( CF3 SO2 ) ( CF3 CH2 OSO2 ) N] , Li[ TFO-TFSI]}, and the corresponding nonaqueous electrolytes of 1.0 mol/L Li[TFO-TFSI] in a mixture of ethylene carbonate/ethyl methyl carbonate(EC/EMC, 3:7, volume ra-tio) were prepared. The structure, composition and purity of the as-prepared Li[ TFO-TFSI] were confirmed by nuclear magnetic resonance spectroscopy ( NMR ) , infrared spectroscopy ( IR ) , mass spectrometry ( MS ) , elemental analysis( EA) , and ion chromatography( IC) . The thermal properties of Li[ TFO-TFSI] and its non-aqueous electrolytes, 1.0 mol/L Li[TFO-TFSI]-EC/EMC(3:7), were characterized by differential scanning calorimetry( DSC) and thermogravimetric analysis( TGA) . The fundamental properties of nonaqueous electro-lyte solution of Li [ TFO-TFSI ] were characterized by electrochemical impedance spectroscopy ( EIS ) , cyclic voltammetry( CV) , chronoamperometry and scanning electron microscope( SEM) . The nonaqueous electrolytes of Li[ TFO-TFSI] shows excellent electrochemical stability, and does not corrode Al below 4.2 V. Both Li/synthetic graphite and synthetic graphite/LiCoO2 cells using Li[ TFO-TFSI] show good cycling performances at room temperature, and the graphite/LiCoO2 cells using Li[ TFO-TFSI] shows much better capacity retention after 100 cycles than those using LiPF6 .