dc.description.abstract | With the rapid development of electronic products and electric vehicles, Li-ion batteries have become an energy resource in daily life. According to statistics, by 2016, the global demand for Li-ion batteries has surpassed 94GWh per year and will grow to 200GWh in 2025. And the annual demand for lithium battery raw materials will be more than 300,000 tons. However, the battery after years of charge and discharge cycles, its capacity and electrical properties will gradually disappear or reducing. If not properly handled as a low-capacity and inactivity battery, it will bring environment pollution, ecology pollution and resources exhausted.
In this study , we propose a new method of the two- phase circular economy model through the data envelopment analysis (DEA) and the experimental method which include reusing and recycling stage. The first stage we mainly use data envelopment analysis allocation model to calculate the best shift point of Li-ion battery from automotive stage to storage stage and extend the battery life. The second stage through the experimental method let retired-battery recycle by the physical and chemical method, to obtain high purity lithium carbonate raw materials. To reduce the consumption of lithium source, environmental protection and reduce production costs.
The study found that the first stage of retired lithium battery shift from automotive applications to storage applications by 1: 1 cycle ratio is the best energy shift point, and provided the most efficient using method of the battery. The second stage could access high purity lithium carbonate, ferrous phosphate, and other renewable raw materials. We extract 1gram high purity Li2Co3 from per 1Ah retired battery. According to the price trend, it’s predicted to recycling 12,272 tons of lithium carbonate in 2020, and the output value will reach 103M USD per year around the world. This will be enhanced the environmental protection of Li-ion batteries, and achieve the effectiveness of circular economy (CE). | en_US |