本文選題：鋰原電池 + 高溫儲存　； 參考：《天津大學》2014年碩士論文

【摘要】：以金屬鋰為負極的鋰原電池（不可再充電的鋰一次電池），如鋰-錳電池、鋰-二氧化硫電池、鋰-亞硫酰氯電池等，具有高比能、大容量、高可靠性等特點，可用于便攜式電器和電子裝置，已經(jīng)在國民經(jīng)濟的各個領域中得到了廣泛的應用。由于在鋰原電池的實際使用過程中，不可避免地需要在使用前儲存一段時間，，而在這一儲存過程中，特別是在高溫儲存條件下，電池的性能如放電容量、電池阻抗、安全性能等會出現(xiàn)一定程度的下降，而這些下降會不同程度地影響到鋰原電池的使用效果。為了深入研究鋰原電池的貯存性能，本文針對兩種新型鋰原電池，即鋰-亞硫酰氯（Li/SOCl2）電池和鋰-氟化碳（Li/CFx）電池，分別研究了不同儲存時間和不同儲存溫度對電池放電性能的影響規(guī)律。 首先，本文以氟化碳為正極，金屬鋰為負極制備了Li/CFx電池（865mAh·g-1），然后分別考察了電池在40℃、55℃、70℃的溫度下儲存一定時間后的放電性能，并且通過SEM、XRD等測試手段表征了電池正極儲存前后表面形貌和活性物質相結構的變化。實驗發(fā)現(xiàn)，儲存溫度越高，儲存時間越長，Li/CFx電池容量的衰減越嚴重，放電的電壓平臺越低，電壓滯后現(xiàn)象也越明顯。SEM的測試結果表明，高溫儲存后，CFx正極表面產(chǎn)生了許多大小均勻的LiF顆粒。從XRD的分析可知，電池在高溫儲存過程中會發(fā)生自放電反應，產(chǎn)生了高阻抗的LiF。 由于金屬鋰非常活潑，Li/SOCl2電池在高溫下儲存時，電池容量會發(fā)生不同程度的衰減，而且儲存時間不同，電池容量衰減的程度也不一樣。本文研究了不同儲存溫度和不同儲存時間對Li/SOCl2電池放電性能的影響。實驗結果表明，儲存溫度越高，儲存時間越長，電池放出的容量越少，放電電壓平臺也越低，儲存后電池的阻抗也變得越大。此外，Li/SOCl2電池在高溫下儲存一段時間后，開路電壓也會升高。 文章最后通過加速壽命試驗的方法對Li/SOCl2電池在常溫下的儲存壽命進行了預測，由0.01C的放電數(shù)據(jù)得到的儲存壽命模型為：t=0.00135+4900.45*0.9094T，由此可預測出電池常溫下的儲存壽命為456.19天；由0.03C放電數(shù)據(jù)得到的儲存壽命模型為：t=-0.8582+3362.6*0.91734T，并預測電池在常溫下的儲存壽命為388.09天。
[Abstract]:Lithium primary battery with metal lithium as negative electrode (non-rechargeable lithium primary battery, such as lithium manganese battery, lithium sulfur dioxide battery, lithium thioacyl chloride battery, etc.) has the characteristics of high specific energy, large capacity, high reliability, etc. Can be used in portable electrical and electronic devices, has been widely used in various fields of the national economy. In the actual use of the lithium battery, it is inevitable to store it for a period of time before it is used, but in this storage process, especially under the condition of high temperature storage, the battery performance such as discharge capacity, battery impedance, The safety performance will decrease to a certain extent, and these decreases will affect the effect of lithium primary battery to some extent. In order to study the storage performance of lithium battery, two new types of lithium primary battery, namely Lithioyl chloride Lip / SOCl2) battery and Li-fluorocarbon lithium / CFX battery, were studied in this paper. The effects of different storage time and storage temperature on the discharge performance of the battery were studied. Firstly, Li/CFx battery was prepared by using carbon fluoride as positive electrode and lithium metal as negative electrode. The discharge performance of Li/CFx battery was investigated after storage at 40 鈩

本文編號：1884871