Study On Environmental Benefits Of Lithium-Ion Batteries In Life Cycle Based On Green Development Concept

In recent years,pure electric vehicles(EVs)have been called "zero-emission" vehicles because they have got rid of dependence on petroleum resources and reduced emissions of greenhouse gases such as carbon dioxide and other environmental pollutants in the process of vehicle operation.As the core component of pure electric vehicles,lithium-ion power batteries will inevitably be accompanied by a large number of pollutants in the production,use and recovery process,which will cause important environmental problems.Therefore,based on the life cycle assessment method,this paper chooses lithium iron phosphate battery and lithium nickel cobalt manganese oxide battery,which account for the largest proportion in the commercial market of lithium-ion batteries,as the research objects.Through the establishment of evaluation model,the environmental impact of two lithium-ion batteries on the life cycle research system boundary is analyzed.The system boundary covers the battery production stage,the use stage and the recovery stage,in which the battery production stage.Including parts production,parts assembly and product shipment.Environmental impacts are classified into global warming(GWP),acidification effect(AD),eutrophication(EP),photochemical pollution(PP)and ozone depletion(OLD).The contribution analysis method is used to identify hot-spots,determine the main environmental problems and the links.Finally,through the sensitivity factor analysis,the impact of important parameter changes on environmental problems is obtained.In addition,based on the recovery method analyzed in this paper,the recovery quantities of valuable metals in lithium iron phosphate batteries and lithium nickel cobalt manganese oxide batteries in the future battery scrap tide are predicted in the recovery stage.The results show that lithium iron phosphate batteries have less environmental impact and more environmental protection than lithium nickel cobalt manganese oxide batteries.From the point of view of system boundary,the production stage is the main link of environmental problems for the two batteries.For lithium iron phosphate batteries,the production of battery shell is the main factor causing environmental problems,and for lithium nickel cobalt manganese oxide batteries,the production ofcathode materials is the main factor.From various environmental problems,global warming is the main environmental problem.Through sensitivity analysis,it was found that in the production stage of lithium iron phosphate batteries,increasing polypropylene plastics and reducing the proportion of aluminium metal used in battery shell play an important role in reducing greenhouse gas emissions.In the use stage,adjusting the energy supply structure also play an important role in energy conservation and emission reduction.The results show that lithium iron phosphate batteries are more environmentally friendly,and can be used as a reference for future lithium battery enterprises or related industries to formulate the strategies of these two products under the premise of national environmental protection requirements.At the same time,in building a green transportation network,electric vehicles powered by lithium iron phosphate batteries can be the main direction of urban traffic development.