有机电解液对氟化碳电极界面性能研究

发布时间：2018-04-01 12:27

  本文选题：锂/氟化碳电池　切入点：C5H11PF2O3　出处：《云南师范大学》2014年硕士论文

【摘要】：本文主要工作如下： 1、简要论述了锂电池发展历程，锂/氟化碳电池的优缺点，锂电池有机电解液的分类和选取，氟化碳材料的制备工艺和近期发展。 2、合成了一种氟化酯类有机化合物C5H11PF2O3，将其用于锂/氟化碳电池电解液体系。 3、深入研究常温时电极/电解液界面性能，探讨锂盐、有机溶剂对其电化学性能的影响。从锂盐方面来说，LiBF4具有良好的电化学稳定性和高低温性能。在有机溶剂方面，制备所得的C5H11PF2O3粘度大，导电性能较差，不可以单独作为锂/氟化碳电解液的溶剂。PC:DME=1:1体系与氟化碳电极的倍率性能较好。C5H11PF2O3（A）与常用电解液体系混合（PC:DME:A=1:1:1, v:v:v），会影响电解液体系的性能。 4、进一步研究高温55℃时锂/氟化碳电池电极与电解液之间的界面电化学性能。C5H11PF2O3作为单一溶剂构成电解液，性能发挥的不佳。PC:DME=1:1小倍率下性能良好，但大倍率时性能较差，容量衰减较快。C5H11PF2O3（A）与常用电解液体系混合（PC:DME:A=1:1:1, v:v:v），在大倍率下拥有更高的放电电压，放电曲线平滑，可以表现出较佳的高温性能。 5、研究了不同氟化度的氟化碳材料对锂/氟化碳电池性能的影响。采用球形碳作为碳源制备氟化碳材料，，通过SEM、FT-IR、XRD等测试手段分析了不同氟化度氟化碳材料的结构特点，并对不同氟化度氟化碳材料的电化学性能进行了测试和比较，深入地了解了氟化碳材料结构对其电化学性能的影响因素。
[Abstract]:The main work of this paper is as follows:1. The development of lithium battery, the advantages and disadvantages of lithium / fluorocarbon battery, the classification and selection of organic electrolyte for lithium battery, the preparation technology and recent development of fluorocarbon material are briefly discussed.A fluorinated ester organic compound C5H11PF2O3 was synthesized and used in lithium / carbon fluoride battery electrolyte system.3. The interfacial properties of electrode / electrolyte at room temperature were studied, and the effects of lithium salts and organic solvents on their electrochemical properties were discussed.LiBF4 has good electrochemical stability and high and low temperature properties from the aspect of lithium salts.In the aspect of organic solvent, the prepared C5H11PF2O3 has high viscosity and poor conductivity.It can not be used alone as the solvent of lithium / fluorocarbon electrolyte. PC: DME1: 1: 1 system and carbon fluoride electrode have better rate performance. C5H11PF2O3A) and common electrolyte system can be mixed with PCDME1: A1: 1: 1: 1, vvvvv1%, which will affect the performance of electrolyte system.4. The interfacial electrochemical performance of lithium / carbon fluoride battery electrode and electrolyte at 55 鈩

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