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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/6031


    Title: 新型高分子電解質之合成與性質探討;New polymer electrolyte for lithium battery base PVDF-HFP system
    Authors: 呂明怡;ming-yi Lu
    Contributors: 化學研究所
    Keywords: 鋰電池;高分子電解質;孔洞式高分子電解質;polymer electrolyte;lithium battery;porous-type polymer electrolyte
    Date: 2004-06-23
    Issue Date: 2009-09-22 10:12:09 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 摘要 小型二次電池中,鋰二次電池具有高工作電壓、循環壽命長、使 用溫度範圍廣且無記憶效應等優點,而一般電池因受限於電解液的儲 存,無法做到輕薄短小的產品,所以將液態電解質用固態的高分子電 解質取代,可使產品不受形狀與尺寸大小的限制。本篇實驗主要是探 討高分子電解質PEO/LiClO4摻入不同含量的聚苯胺衍生物高分子以 製備成乾式高分子電解質膜及PVdF-HFP 摻入不同比例之 poly-(ethylene glycol)- block-poly(propylene glycol)-block-poly(ethylene glycol)高分子,再以相轉變法或直接揮發成膜法製備孔洞式高分子 膜,再浸泡1M LiClO4 EC/PC (V/V =1:1)溶液以製成孔洞式高分子電 解質的各種性質。由於乾式高分子電解質系統無法達到可商業化的離 子導電度,所以本實驗的探討著重於孔洞式的高分子電解質膜部分, 在此部分我們使用兩種不同分子量的共聚高分子:poly(ethylene glycol)-block-poly(propylene glycol)-block-poly (ethylene glycol),分別 為P123 (Mw=5750)及F108(Mw=14600)。在相轉變法製備PVdF-HFP 高分子膜時,摻入不同含量的P123 或F108 可修飾高分子膜的孔洞結 構,進而改善高分子電解質膜的電解液吸附量及漏液情形。實驗結果 發現隨著P123 或F108 含量的增加,高分子膜的孔洞變小且密度增 加,並在分別摻入70 wt%的P123 或50 wt%的F108 時,混合高分子 膜會有孔道的形成,含有P123 或F108 之混合高分子電解質膜,導電 度較高且漏液量較少,室溫導電度可達4 × 10-3 S/cm,其可耐電壓高 達5.0 V,達到商業化應用可能。 Abstract Rechargeable lithium ionic battery, compared to other secondary batteries, has the advantages of high working potential, high specific energy, wide applied temperature and no memory effect. However, in order to make a small light-weight batteries, a solid electrolyte was needed. Solid polymer electrolytes can be categorized into three types: dry-type polymer electrolyte, gel-type polymer electrolyte, and porous-type polymer electrolyte. In this studies, two systems were studied: polyaniline derivative was blended with PEO-LiClO4 electrolyte to increase the ionic conductivity of the dry-type polymer electrolyte and PVDF-HFP was mixed with polyalkoxy block copolymer such as P123 (Mw=5750) or F108 (Mw=14600) to form porous-type polymer membranes. The porous polymer membranes were then sock in LiClO4-EC/PC solution to form porous-type electrolytes. It was found that the ionic conductivity of dry-type polymer electrolyte is too low to be commercially viable. Therefore, the study is mainly focused on the porous-type polymer electrolyte. The porous membranes were prepared by both phase inversion and evaporating methods. They were then immersed in 1 M LiClO4 –EC/PC (1:1) solution to form porous polymer electrolytes. The pore structure and density of polymer membrane varied with the ratios of P123 (or F108). Low solution leakage, high conductivity polymer electrolyte was found when 30 ~ 50 wt% of P123 was blend with PVDF-HFP. The room temperature conductivity of these hybrid porous polymer electrolytes was up to 4 × 10-3 S/cm and they can stand up to 5.0 V. They have great potential to be applied in lithium ion batteries.
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