本文選題：LiBSB + LiBOB��； 參考：《遼寧大學》2017年碩士論文

【摘要】：電解質(zhì)是電池的重要組成部分之一,電解質(zhì)對電池性能有直接的影響,其中,電導率大小及穩(wěn)定性是制約電池性能的重要因素。在尋找新型電解質(zhì)材料的同時,對已有的電解質(zhì)材料優(yōu)化和改善也具有非常重要的意義。目前,獲得高品質(zhì)二次電池的電解質(zhì)也是當前化學研究的熱點課題之一。本論文目標在于通過混合鹽組合的方式,改進雙水楊酸硼酸鋰(LiBSB)電解質(zhì)的相關性能。首先,以水楊酸、硼酸、一水合氫氧化鋰和一水合草酸為原料,通過固相燒結法合成6種不同比例鋰硼鹽LiBSB、LiBSB-LiBOB-1、LiBSB-LiBOB-2、LiBSB-LiBOB-3、LiBSB-LiBOB-4和LiBOB。對所合成的6種化合物進行了IR、XRD、SEM及TG等方法的表征。電導率測試結果可以看出,其他5種鋰硼鹽的電導率高于LiBSB,但熱穩(wěn)定性卻低于LiBSB。當草酸和水楊酸的比例為一定值時,化合物的電導率值達到最大。另外,對所合成的鋰硼鹽0天和15天的熱重進行分析,發(fā)現(xiàn)6種鋰硼鹽都有一定的吸濕性。其次,以水楊酸、硼酸、一水合氫氧化鋰和羧基碳球(HTC)為原料,通過固相燒結法合成了LiBSB/C包覆物。對所合成的LiBSB/C包覆物,采用IR、XRD、TG及SEM等方法進行了表征。通過SEM和TG分析發(fā)現(xiàn),當采用LiBSB化合物對HTC進行包覆時,可以一定程度改善它的吸濕性。對所合成的包覆物溶液電導率進行測試,結果表明LiBSB/C包覆物的離子電導率要低于LiBSB鹽自身電導率值。為解決電導率和吸濕性的問題,以水楊酸、二水合草酸、硼酸、一水合氫氧化鋰和羧基碳球(HTC)為原料,合成了LiBSB-LiBOB/C的系列化合物,同樣采用IR、XRD、SEM及TG等方法對該系列化合物進行了表征。結果發(fā)現(xiàn),LiBSB-LiBOB/C與LiBSB-LiBOB相比,不僅吸濕性有所改善,熱穩(wěn)定性也一定程度得到了提高。LiBSB-LiBOB/C在PC、AN和DMF等三種溶劑中的電導率進行測試,其在AN中的電導率最高,而在PC中的電導率最低。結合熱重分析及電導率測試結果發(fā)現(xiàn),當HTC達到一定量時,化合物具有較高的電導率,且熱穩(wěn)定性高。
[Abstract]:Electrolyte is one of the important components of the battery. The electrolyte has a direct impact on the performance of the battery, among which, the conductivity and stability are important factors that restrict the performance of the battery. At the same time, it is of great significance to optimize and improve the existing electrolyte materials. At present, obtaining high-quality electrolytes for secondary batteries is also one of the hot topics in chemical research. The aim of this thesis is to improve the properties of LiBSBs electrolyte by mixing salt. Firstly, six kinds of LiBSB-LiBSB-LiBOB-1 LiBSB-LiBOB-2 + LiBSB-LiBOB-3 (LiBSB-LiBOB-3) and LiBSB-LiBOB-4 (LiBSB-LiBOB-4) were synthesized by solid-state sintering from salicylic acid, boric acid, lithium hydroxide monohydrate and oxalic acid monohydrate. The synthesized six compounds were characterized by IR XRD SEM and TG. The conductivity test results show that the conductivity of the other five lithium borates is higher than that of LiBSBs, but the thermal stability is lower than that of LiBSBs. When the ratio of oxalic acid and salicylic acid is a certain value, the conductivity of the compound reaches the maximum. In addition, the thermogravimetric analysis of the synthesized lithium-borate at 0 and 15 days showed that all of the six lithium-boron salts had certain moisture absorption. Secondly, the LiBSB/C coating was synthesized by solid phase sintering from salicylic acid, boric acid, lithium hydroxide monohydrate and carboxyl carbon ball HTC. The synthesized LiBSB/C coating was characterized by IR XRD TG and SEM. By SEM and TG analysis, it was found that the hygroscopicity of HTC could be improved to some extent when LiBSB compound was coated. The results show that the ionic conductivity of LiBSB/C coating is lower than that of LiBSB salt. A series of LiBSB-LiBOB/C compounds were synthesized from salicylic acid, oxalic acid dihydrate, boric acid, lithium hydroxide monohydrate and carboxyl carbon ball HTC. The compounds were also characterized by IR XRD SEM and TG. The results show that compared with LiBSB-LiBOB, LiBSB-LiBOB / C not only improves the hygroscopicity, but also improves the thermal stability of LiBSB-LiBOB / C in some extent. The conductivity of LiBSB-LiBOB / C in PC and DMF is the highest in an and the lowest in PC. Combined with thermogravimetric analysis and conductivity test, it was found that when HTC reached a certain amount, the compound had high conductivity and high thermal stability.
【學位授予單位】：遼寧大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O614.111;O646

【參考文獻】

相關期刊論文 前9條

1 李琪;喬慶東;王艷菊;韓江燕;;硼基鋰鹽電解質(zhì)在鋰離子電池中應用研究進展[J];化工新型材料;2015年02期

2 李楊;連芳;周國治;;應用于鋰離子電池的無機晶態(tài)固體電解質(zhì)導電性能研究進展[J];硅酸鹽學報;2013年07期

3 李青海;劉海忠;;固體電解質(zhì)膜對PEMFC電極動力學的影響[J];化工學報;2004年S1期

4 田春霞;鋰離子蓄電池固體聚合物電解質(zhì)研究進展[J];電源技術;2002年03期

5 黃峰,周運鴻;鋰離子電池電解質(zhì)現(xiàn)狀與發(fā)展[J];電池;2001年06期

6 胡樹文,張正誠,方世璧;鋰離子電池用聚合物固體電解質(zhì)的新進展[J];高分子通報;2001年01期

7 吳宇平,萬春榮,姜長印,李建軍,李陽興;金屬鋰二次電池的研究進展[J];功能材料;2000年05期

8 林霞;淺談電解質(zhì)溶液理論[J];廣西師院學報(自然科學版);1997年03期

9 任仁;淺談固體電解質(zhì)及其應用──兼議如何正確定義電解質(zhì)[J];大學化學;1995年03期

，

本文編號：1889933