Abstract
With the developing research on anode materials for lithium ion batteries, organic anode materials have gained increasing attention nowadays. Compared with inorganic anode materials, organic anode materials have numerous material options and extensive sources. Moreover, they consume low energy and can enter carbon cycles, which are environment friendly. indigotindisulfonate lithium is characterized with a unique redox reaction and can be used as an anode material. Indigotindisulfonate Lithium can be produced by using indigo as a raw material sulfonated with fuming sulfuric acid, and further reacted with Li2CO3. Regarding this issue, impacts of various factors under different conditions were investigated, and an orthogonal experimental design method was proposed based on optimization conditions. This method was established through T-6 new century ultraviolet spectrophotometer to determine the influence of different conditions, and develop a best combination based on different microwave powers (w), temperatures (°C), and time lengths (min). In this experiment, the maximum absorption peak was determined by scanning wave length, under which the absorbency was identified and the standard curve was established. In order to determine the optimized synthesis condition of indigotindisulfonate lithium, orthogonal experiment design method was applied combining three levels coupled with four factors. From this study, it is concluded that 550w, 3min, 30°C with an indigo-fuming sulfuric acid concentration ratio of 0.02:1 is the best condition to synthesize indigotindisulfonate lithium.
Highlights
With the development of science and technology, lithium and its compounds are more and more widely used in various fields
The orthogonal experimental design method was adopted in this experiment to determine the optimized synthesized condition of indigotindisulfonate lithium
The optimal condition was under 550w, 3min, 30°C with a concentration ratio of 0.02:1 between indigo solution and fuming sulfuric acid
Summary
With the development of science and technology, lithium and its compounds are more and more widely used in various fields. The demand of lithium products in the global world is increasing yearly, and the cost of lithium products is increasing significantly as well. There are abundant salt lake lithium resources in Qaidam basin of Qinghai province. The exploitation of lithium and its compounds will play a significant role in enhancing economy in Western part of China. Mounting evidence demonstrates that the resource oflithium brine in China ranks the top first in the global world, accounting for about 66% of the total lithium reserve in the salt lake. The quantity of lithium chloride in Qarhan Salt Lake ranks No.[1] in the world [1]
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