奈米複合電極及固態高分子電解質組裝之鋰二次電池之製備及性質研究

The Study of Preparation and Properties of the Lithium Rechargeable Batteries Based on Nanocomposite electrodes and Nanocomposite Polymer Electrolytes

廖哲偉(Che-Wei Liao)

指導教授 ： 陳玉惠

中原大學/理學院/化學研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400269

摘要

本研究製備出一系列不同成分組成之複合正極，並配合本研究室長期研究之固態複合高分子電解質及鋰金屬負極，組裝成鋰金屬高分子二次電池，探討其電容量、充放電效益、循環壽命及電池阻抗的性質與影響。在複合正極方面，係利用電解質當接著劑(binder)，添加不同比例之LiCoO2和助導材料製作而成，探討在不同比例下其性質與特性的變化，並找出最佳之製作條件。電池組裝方面，以製作出之複合正極配合本研究室製備出的固態複合高分子電解質，組裝成鋰金屬高分子電池，探討其電極與電解質的相容性、電容量、循環壽命及充放電效能等電化學性質。結果顯示，所製備含 [85wt% LiCoO2-
7wt%binder-8wt%(20wt%Super-P/80wt%CMS)] 之D1極片之電容量達105mAh/g，而配合固態電解質組裝之電池的充放電結果，顯示所製備之固態鋰金屬高分子二次電池具有3.9V的工作電壓，且有一個平穩的放電平台及不錯的充放電效益;其第二次放電電容量為80.3 mAh/g，經過五十次循環之後，其放電電容量仍達69.7 mAh/g，顯示其有不錯的循環性。此結果顯示所製備出的全固態鋰金屬高分子二次電池，之電壓高（3.9 V），放電電壓穩定，且不會有漏液之危險，具可輕、薄、短、小、無線化等實用化的潛能。

關鍵字

複合正極 ； 高分子電解質 ； 鋰高分子二次電池

並列摘要

In this study, the positive electrodes (cathodes) with different composition for lithium rechargeable polymer batteries (LPBs) were made by casting a solution consisting of active material (LiCoO2), conducting material (super-p, CMS, MGP), polymer binder, and solvent. The polymer batteries were prepared by sandwiching the solid polymer electrolyte (NF6A7.5) between the composite cathode and the lithium metal anode. The electrochemical properties such as impedance, capacity, charge efficiency and life cycle are studied.
The highest room temperature conductivity of 2.2×10-3 S/cm is obtained for the NF6A7.5 solid polymer electrolyte with a thickness of about 45μm. The maximum discharge capacity of 105 mAh/g at room temperature is measured for the composite cathode D1 [85wt% LiCoO2-7wt%binder-8wt% (20wt%Super-P/80wt%CMS) ] .
The cyclic performance of Lithium rechargeable polymer batteries, Li/NF6A7.5/D1, shows a good charge-discharge cycling performance and a stable work potential at 3.9V. The highest discharge capacity has been obtained at the second cycle and is 80.3 mAh/g. After 50 cycles, the discharge capacity remains as 69.7mAh/g, showing a good life cycle and stability of the batteries.

並列關鍵字

composite cathode ； lithium rechargeable polymer batteries ； polymer electrolyte

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