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Title: | 全固態鋰離子電池過充特性的探索 The application of the all-solid-state lithium-ion battery in overcharge situation |
Authors: | YU-WEI HONG 洪鈺葳 |
Advisor: | 陳國慶(KUO-CHING CHEN) |
Keyword: | 全固態電池,鋰離子電池,過充, all-solid-state battery,lithium-ion battery,overcharge situation, |
Publication Year : | 2018 |
Degree: | 碩士 |
Abstract: | 在本論文中,我們將全固態電池以定電流充電的方式,使電池過充至不同程度,透過所量測的溫度曲線可發現,電池在大幅度過充時,其表面溫度仍只高於環境溫度2-3℃。又透過分析固態電池在過充時,其內阻的變化可以發現,內阻成長可分為內阻緩慢成長期和內阻激增期等兩部分。比較電池在飽電狀態、內阻緩慢成長期和內阻激增期等三種狀態下,電池老化速度的差異性我們發現,電池在觸發不可逆反應後,確實有著老化速度大增的現象。雖然電池再內阻緩慢成長區間中進行循環時,電池老化速度明顯較飽電狀態下來的迅速,但這可能是因為目前的固態電池生產品質並不穩定,又或是充入電量太多使得電極在膨脹和收縮的過程中,產生不可逆的機械性破壞,進而導致電極內部活性材料減少的緣故。雖然固態電池在小幅度過充後,仍然會使電池老化速度加速,但老化速度地增加卻可以使每一次循環的使用時間延長,這不僅可以讓生產方滿意亦可滿足消費者的需求。 In this thesis, we use the method of constant-current charging to make the all-solid-state battery overcharge to different degrees. It is found that surface temperature of the battery is only 2-3°C higher than ambient temperature when the battery is highly overcharged by the measured temperature curve. By analyzing the change of the internal resistance of the all-solid-state battery, it is found that the internal resistance can be divided into two parts, which are slow and fast-growing period by analyzing the change of the internal resistance when the all-solid-state battery is overcharged. Comparing the differences of the battery aging speed in the state of full charge, internal resistance slow growth and internal resistance swift growth, we found that the battery aging speed is indeed increasing after triggering the irreversible reaction. Although the battery aging speed is obviously faster than the state of full charge when the battery is cycling in the slow resistance growth interval. It may be since the current production quality of all-solid-state battery is not stable, or the charge quantity is too much that causes irreversible mechanical damage occurs during the expansion and contraction and it leads to a decrease in the active material inside the electrode. Although the all-solid-state battery will accelerate the aging rate of the battery after a small overcharge, the aging speed can increase the usage time of each cycle, which satisfies not only the production side but also the needs of consumers. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/22029 |
DOI: | 10.6342/NTU201803015 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 應用力學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-107-1.pdf Restricted Access | 6.52 MB | Adobe PDF |
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