本文關(guān)鍵詞：可充電鎂碘電池含碘復(fù)合材料的制備及其電化學(xué)性能研究　出處：《天津理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： β-環(huán)糊精 活性碳纖維 碘 鎂碘電池

【摘要】：科學(xué)技術(shù)的快速發(fā)展,對儲能電池的性能提出了新的要求,尋找一種新的清潔、安全、高效的電池體系迫在眉睫。碘作為陰極具有較高的理論容量(211 mAh g-1),以金屬鋰作為陽極,碘作為陰極的鋰碘電池具有較高的能量密度和倍率性能,然而鋰在充放電過程中會產(chǎn)生枝晶,使得直接以鋰當(dāng)作陽極的電池體系存在嚴(yán)重的安全問題。金屬鎂是一種理想的陽極材料,其具有較負(fù)的電極電勢(-2.36 V vs.NHE),與金屬鋰相比金屬鎂具有更高的體積能量密度(3833 mAh cm-3),以金屬鎂作為陽極,碘作為陰極的鎂碘電池體系具有較好的應(yīng)用前景。本文通過使用β-環(huán)糊精和活性碳纖維兩種不同的材料來固定碘,研究其作為鎂碘電池正極的電化學(xué)性能,并進(jìn)一步討論了使用雙三氟甲烷磺酰亞胺鋰(LITFSI)作為電解液添加劑對于鎂碘電池體系的影響。首先,我們使用β-環(huán)糊精作為固碘材料,通過紫外光譜測試確定了β-環(huán)糊精/碘復(fù)合物中碘的含量為17%。對β-環(huán)糊精/碘復(fù)合物進(jìn)行XPS測試表明復(fù)合物中β-環(huán)糊精與碘之間的相互作用主要為物理吸附,進(jìn)行熱重分析表明β-環(huán)糊精對碘的吸附作用顯著提升了碘的熱穩(wěn)定性。以β-環(huán)糊精/碘復(fù)合物作為正極,金屬鎂作為負(fù)極,一定濃度Mg(ClO4)2的DMSO溶液作為電解液組裝電池。對組裝的鎂碘電池以0.1 C的倍率進(jìn)行放電,0.2 C的倍率進(jìn)行充電,初始放電容量為138 mAh g-1,電池循環(huán)20周后,放電容量為50 mAh g-1,組裝的鎂碘電池循環(huán)的庫倫效率為70%左右。使用β-環(huán)糊精碘/復(fù)合物作為鎂碘電池正極具有價(jià)格便宜,制備簡單等特點(diǎn),其在分子級別上對碘的吸附和脫附對于進(jìn)一步研究鎂碘電池的機(jī)理有一定的意義。其次,我們使用活性碳纖維作為固碘材料,研究活性碳纖維/碘復(fù)合物的電化學(xué)性能。使用活性碳纖維/碘復(fù)合物作為正極,金屬鎂作為負(fù)極,0.3 mol L-1[Mg(THF)6][AlCl4]2的PYR14TFSI和THF(V:V=1:1)混合液作為電解液組裝電池。對組裝的鎂碘電池進(jìn)行相應(yīng)的循環(huán)伏安(CV)測試,在所得到的CV曲線上存在兩組氧化還原峰,分別對應(yīng)著I2/I3-和I3-/I-兩個(gè)氧化還原電對的轉(zhuǎn)化。以0.1 C的倍率進(jìn)行放電,0.2 C的倍率進(jìn)行充電,對電池進(jìn)行充放電測試,初始放電容量為142 mAh g-1,但隨著充放電測試的進(jìn)行,電池的容量存在顯著的衰減,第五周時(shí)電池的放電容量只有58mAh g-1。使用活性碳纖維/碘復(fù)合物作為正極省去了導(dǎo)電添加劑、粘結(jié)劑和集流體的使用,簡化了制作流程,降低了電池的成本,但是電池的循環(huán)性能還需要進(jìn)一步提升。最后,為了進(jìn)一步提升鎂碘電池的性能,我們使用LITFSI作為電解液中的添加劑,研究電解液含鋰鹽的鎂碘電池的電化學(xué)性性能。電池充放電結(jié)果表明,其性能要明顯優(yōu)于不含鋰鹽的體系,初始放電容量為231 mAh g-1,50周循環(huán)后容量還能保持在60mAh g-1左右�；钚蕴祭w維具有價(jià)格便宜、導(dǎo)電性好、吸碘能力強(qiáng)等特點(diǎn),以活性碳纖維/碘復(fù)合物作為正極的鎂碘電池具有良好的應(yīng)用前景。
[Abstract]:The rapid development of science and technology, puts forward new requirements on the performance of the storage battery, look for a new kind of clean, safe, efficient imminent battery system. The theoretical capacity of iodine as a cathode with high (211 mAh g-1), with lithium metal as anode, energy density and rate capability of iodine as a lithium iodine battery cathode the high, however, will produce lithium dendrite in the process of charge and discharge, the lithium battery anode directly to the system as a serious security problems. Magnesium is a kind of ideal anode material, which has low potential (-2.36 V vs.NHE), compared with the metal lithium magnesium has the advantages of energy higher density (3833 mAh cm-3), with metal magnesium as the anode and cathode of the iodine iodine as magnesium battery system has good application prospects. In this paper, through the use of beta cyclodextrin and activated carbon fiber, two different materials to fixed iodine, Study on the electrochemical properties of magnesium as iodine cell, and further discusses the use of double three methane sulfonyl imide lithium fluoride (LITFSI) as the effects of electrolyte additives for magnesium iodide battery system. Firstly, we use the beta cyclodextrin as solid iodine materials by ultraviolet spectroscopy test to determine the beta cyclodextrin / content compound iodine iodine 17%. XPS test on cyclodextrin / iodine complexes show that the interaction between complexes of cyclodextrin and iodine is mainly physical adsorption, thermogravimetric analysis showed that the adsorption effect of cyclodextrin on iodine significantly improves the thermal stability of iodine in beta. Cyclodextrin / iodine complexes as cathode, magnesium as anode, a certain concentration of Mg (ClO4) 2 DMSO solution as electrolyte battery assembly. The assembly of iodine magnesium battery discharge at 0.1 C rate, 0.2 C rate for charging, the initial discharge capacity was 138 MAh g-1, the battery after 20 cycles, the discharge capacity of 50 mAh g-1, assembled magnesium iodine battery cycle efficiency in Kulun is about 70%. The use of beta cyclodextrin complexes as anode magnesium / refined iodine iodine battery has the advantages of low price, simple preparation and its characteristics, at the molecular level of iodine adsorption and desorption for the further study on the mechanism of magnesium iodine battery has certain significance. Secondly, we use the activated carbon fiber as solid iodine materials, electrochemical properties of activated carbon fiber / iodine complex. Using activated carbon fiber / iodine complexes as cathode, magnesium as anode, 0.3 mol L-1[Mg (THF) 6][AlCl4]2 and PYR14TFSI THF (V:V=1:1) mixed solution as the electrolyte battery assembly. The assembly of iodine magnesium battery corresponding cyclic voltammetry (CV) test, the CV curve obtained there are two groups of redox peaks corresponding to I2/I3- and I3-/I- two redox On the transformation. The discharge at 0.1 C rate, 0.2 C rate for charging, charging and discharging test of battery, the initial discharge capacity of 142 mAh g-1, but with the charge and discharge test, the battery capacity has significant attenuation, the discharge capacity of fifth weeks when the battery only 58mAh g-1. using activated carbon the fiber / iodine complex as cathode eliminates the use of conductive additives, binder and current collector, simplifies the production process, reduces the cost of the battery, but the cycle performance of the battery also needs further improvement. Finally, in order to further enhance the performance of magnesium iodine battery, we use LITFSI as an additive in the electrolyte, electrochemical performance of magnesium study on iodine liquid electrolyte battery. The battery charge and discharge. The results show that its performance is better than not containing lithium salt system, the initial discharge capacity of 231 mAh g-1,50 weeks after you can cycle At about 60mAh g-1, activated carbon fiber has the advantages of low price, good conductivity and strong iodine absorption ability. The activated carbon fiber / iodine complex as the positive electrode has good application prospects.

【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM912

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本文編號：1411564