本文選題：鋰離子電池 + 富鋰層狀正極材料��； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：富鋰層狀正極材料由于具有高工作電壓和高放電比容量而受到廣泛關(guān)注,被認(rèn)為是最有前景的新型鋰離子電池正極材料。然而,其在現(xiàn)有電化學(xué)體系下的循環(huán)性能較差,嚴(yán)重阻礙了富鋰層狀正極材料的實際應(yīng)用。因此,為解決上述問題,我們對富鋰層狀正極材料Li_(1.18)Co_(0.15)Ni_(0.15)Mn_(0.52)O_2的電解質(zhì)體系進(jìn)行優(yōu)化,首先使用Li ODFB與Li PF_6作為鋰鹽,制備了Li ODFB/Li PF_6雙鹽電解液。雙鹽電解液提高了材料的界面穩(wěn)定性,使材料在常溫及高溫下都具有良好的循環(huán)性能。進(jìn)一步,我們使用PVDF-HFP作為聚合物基質(zhì),將傳統(tǒng)的1 M Li PF_6液態(tài)電解液制成凝膠聚合物電解質(zhì),凝膠聚合物電解質(zhì)在提高材料的循環(huán)穩(wěn)定性的同時,也將材料的適用溫度提高至70℃。本文不僅為改善富鋰層狀正極材料的電化學(xué)性能提供了新的研究思路,并且通過分析其作用機(jī)理,為富鋰層狀正極材料的實際應(yīng)用提供了一定的實驗與理論依據(jù)。
[Abstract]:Lithium-rich layered cathode materials have attracted wide attention due to their high working voltage and high discharge specific capacity, and are considered to be the most promising cathode materials for lithium ion batteries. However, its poor cycling performance in the existing electrochemical systems seriously hinders the practical application of lithium-rich layered cathode materials. Therefore, in order to solve the above problems, we optimized the electrolyte system of lithium rich layered cathode material Li_(1.18)Co_(0.15)Ni_(0.15)Mn_(0.52)O_2. Firstly, Li ODFB and Li PF_6 were used as lithium salts to prepare Li ODFB/Li PF_6 double salt electrolyte. The double salt electrolyte improves the interfacial stability of the material and makes the material have good cycling performance at room temperature and high temperature. Furthermore, we use PVDF-HFP as the polymer matrix to prepare the gel polymer electrolyte from the traditional liquid electrolyte of 1 M Li PF_6. The gel polymer electrolyte not only improves the cycle stability of the material, but also improves the cycle stability of the material. The suitable temperature of the material was raised to 70 鈩，

本文編號：1890909