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目的:合成新型的有机硅基离子塑晶材料[DTMA][TFSI],测试材料的物理和电化学性能,研究其掺杂改性并作为固态电解质用于锂离子电池。创新点:1.合成新型的有机硅基离子型塑晶材料;2.将三元复合塑晶材料作为固态电解质在室温下用于锂离子电池。方法:1.通过热性能分析,得到材料的塑晶温度区间和融化熵值(图1和表1);2.通过电导率测试,确定塑晶掺杂对导电性能的影响(图2);3.通过对扣式电池的充放电性能、倍率性能、循环性能以及阻抗的测试(图4~7),得到塑晶复合物作为固态电解质的电化学性能以及电池循环的稳定性和可逆性。结论:1.合成新型有机硅基离子塑晶材料[DTMA][TFSI],塑晶温度区间为–26°C到54°C;2.在纯塑晶IPC中添加10% LiODFB和10%PC,得到复合物的电导率为1×10~(-4) S/cm,提高塑晶作为固态电解质在室温下应用的可行性;3.将复合物用于LiFePO_4/Li半电池测试,在C/20倍率下,电池的放电比容量为144 mA·h/g,库伦效率为99%。在50次循环后,容量保持率为94%;4.测试结果表明,新型有机硅基离子塑晶的复合物可作为固态电解质材料应用于锂离子电池,以及更高能量密度的锂-硫和锂-空电池。
OBJECTIVE: To synthesize a new type of organic silicon-based ionic plastic material [DTMA] [TFSI], and to study the physical and electrochemical properties of the material. The doping modification and its application as a solid electrolyte in lithium ion batteries were investigated. Innovation: 1. Synthesis of a new type of silicone-based ionomer plastic material; 2. The ternary composite plastic material as a crystalline solid electrolyte at room temperature for lithium-ion batteries. Methods: 1. Through the analysis of thermal properties, the plastic deformation temperature range and melting entropy value of the material (Figure 1 and Table 1) were obtained; 2. Through the conductivity test to determine the influence of plastic deformation on the conductivity (Figure 2); 3. The electrochemical performance of the plastic-crystal composite as the solid electrolyte and the stability and reversibility of the battery cycle were obtained by the charge-discharge performance, rate performance, cycle performance and impedance test (Figure 4 ~ 7). Conclusions: 1. The new type of organic silicon-based ionic plastic material [DTMA] [TFSI] was synthesized with the temperature range of -26 ° C to 54 ° C. 2. The pure plasticized IPC was added with 10% LiODFB and 10% PC , The conductivity of the composite was 1 × 10 -4 S / cm, so as to improve the feasibility of using plastic crystal as a solid electrolyte at room temperature.3. The composite was used in the LiFePO 4 / Li half-cell test, / 20 rate, the battery discharge capacity of 144 mA · h / g, Coulomb efficiency of 99%. The capacity retention ratio was 94% after 50 cycles. 4. The test results show that the new silicone-based plastic composites can be used as solid electrolyte materials for lithium-ion batteries, as well as higher energy density lithium-sulfur and Lithium - empty battery.