Li7La3Zr2O12與聚偏氟乙烯-六氟丙烯共聚物/聚碳酸亞丙酯 複合型電解質應用於類固態鋰離子電池之研究;Development of Li7La3Zr2O12 and Poly (vinylidene fluoride)- hexafluoropropene/ Poly (propylene carbonate) Composite Electrolyte for Quasi-Solid-State Lithium Batteries

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题名:	Li7La3Zr2O12與聚偏氟乙烯-六氟丙烯共聚物/聚碳酸亞丙酯複合型電解質應用於類固態鋰離子電池之研究;Development of Li7La3Zr2O12 and Poly (vinylidene fluoride)- hexafluoropropene/ Poly (propylene carbonate) Composite Electrolyte for Quasi-Solid-State Lithium Batteries
作者:	龍昱丞;Lung, Yu-Chen
贡献者:	化學工程與材料工程學系
关键词:	鋰電池;固態電解質;石柳石型電解質;lithium battery;Solid state electrolyte;Garnet type electrolyte
日期:	2021-08-10
上传时间:	2021-12-07 11:19:58 (UTC+8)
出版者:	國立中央大學
摘要:	在本研究中透過聚碳酸亞丙酯(Poly (propylene carbonate)，PPC)對於聚偏氟乙烯-六氟丙烯共聚物(Poly (vinylidene fluoride)-hexafluoropropene，PVDF-HFP)進行混摻，並添加少量的離子液體和Li7La3Zr2O12(LLZO)形成複合型類固態電解質，並優化目前已知的製程條件，建立出符合室溫、高能量密度系統、高穩定性，以及優異充放電比電容量之平台。由結果可以得知PVDF-HFP在混摻適量的PPC後，應用於NCM811正極系統時，在室溫下有著優異的低速比電容量(214.36mAh/g @ 25mA/g)、高離子導通率(6.2010-4 S/cm) ，且具有高循環穩定性(~99%)；在後續的研究中在高分子固態電解質中添加不同參雜條件之LLZO粉末可以發現有著明顯的差異，建立有效討論LLZO粉末優勢之平台。藉由此複合性固態電解質，接續討論在一次燒結的條件下(900℃，10小時)不同額外碳酸鋰添加量之LLZO(Al)的差異，可發現當10wt.%額外裡添加時，有著最佳的鋰濃度可以達到優異的低速比電容量(231.03mAh/g @ 25mA/g)、高離子導通率(8.3510-4 S/cm)，以及高循環穩定性(~99%)；最後討論不同比例的陶瓷粉末在複合型固態電解質中的影響，而10wt%的陶瓷粉末添加量為最優異。在本研究中複合型固態電解質有著卓越的性質，證實了PVDF-HFP混摻改質以及LLZO優化添加有助於全固態電解質前景應用。;As green energy are becoming more and more important, many countries have begun to develop energy storage systems. Despite the advantages that Lithium-ion batteries possess due to its high energy density, safety issues are still to be considered. Compared to conventional organic liquid electrolytes, hybrid solid state electrolytes (HSSE) have better mechanical properties, non-flammability and high ionic conductivity. In this work, Polypropylene carbonate (PPC) was used to blend with Poly (vinylidene fluoride)-hexafluoropropene (PVDF- also A small amount of ionic liquid and LLZO(Li7La3Zr2O12)、 LLZAO(Li6.25La3Zr2Al0.25O12) and LLZGO(Li6.25La3Zr2Ga0.25O12) were added to form a composite solid-state electrolyte. The PVDF-HFP/PPC blend matrix shows a lower crystallinity and a high thermostability. The electrolyte consisting of this PVDF-HFP/PPC blend matrix and 10 wt% LLZO displayed improved ionic conductivity(8.35*10-4 S/cm) and superior compatibility. Besides, the NCM 811\|\| Li battery with this HSSE combination delivered a good specific capacitance(229.55mAh/g) and cycling stability(retention 78.12% for 100 cycles @100mA/g). Hence, the preparedcomposite HSSE has great potential for developing high-performance solid-state lithium ion battery.
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