Study On Green Synthesis And Properties Of Solvated Libob

Lithium bisoxalatoborate (LiBOB) as novel lithium salt for lithium (ion) batteries electrolyte, become a research focus, due to its many advantages, such as environmentally friendly, non-corrosion to cathode and anode, high temperature stability, good compatibility with the positive and negative materials. The contribution of this paper lies in the green synthesis of solvated LiBOB (as known as "liquid LiBOB"). Compared to conventional solid-state products, solvated LiBOB with low impurity content was easy to be used. In this paper, we synthesised solvated LiBOB using H3BO3, LiOH, H2C2O4as raw materials, and eval use of green chemistry synthesis evaluation methods, and quality products were electrochemical characterization. The main contents are as follows:1. Solvated LiBOB was synthesized. The effect of the kind of solvent, reaction temperature, the ratio of raw materials was investigated. The product was characterized by NMR, FT-IR and ICP. It was found that, solvated LiBOB could be synthesized through usingling PC, LiOH as solvent and Li source, respectively, and controlling the reaction temperature at70℃. The optimal molar ratio of raw materials was H3BO3:LiOH:H2C2O4= U.13:0.12:0.24. The content of LiBOB in the product was10.03%.2. The quality of the product was evaluatd. Impurities (water, acid and insolubles) content of product was48ppm,9ppm,12ppm, decreased by91%,43%and55%, compared to conventional solid product.3. The synthesing process of solvated LiBOB was evaluated by the principle of green chemistry synthesis. In this paper, non-toxic materials and solvents was used aduring the reaction, and the synthesing process was safe and steady, and atom utilization was reached to73.4%. In a word, the three area of raw materials, reaction and product was green.4. The effects of LiBOB on the performance of stability, safety and rate discharge in MnO2/Li battery was evaluated. Experimental results show that:(1) After being storaged at60℃for7days, The capacity of MnO2/Li battery using LiBOB and LiClO4as mixed lithium salt in electrolyte was200mAh, increased by15mAh, compared to the electrolyte using single LiClO4as llithium salt.(2) On the test of short circuit, the temperature of MnO2/Li battery using above electrolyte of mixed lithium salt was lower than that of battery using electrolyte of single LiClO4.(3) The capacity of MnO2/Li battery using LiBOB and LiClO4as mixed lithium salt in electrolyte was170mAhN104mAh respectively, when the;urrent was2mA and4mA.5. The effects of LiBOB on the high ttemperature performance of lithium-ion battery using as LiMn2O4as cathode was evaluated. Experimental results show that:(1) After finished100cycles at60℃, the capacity retention ratio of LiMn2O4/graphite using electrolyte addded LiBOB was91.2%, higher than that of battery using blank electrolyte,...