Proposal Papers for Policy Making and Governmental Action toward Low Carbon Society

LCS-FY2017-PP-02

Secondary Battery System (Vol. 5):
Cost Evaluation and Technological Challenges of a Lithium Sulfur Battery

Summary

 To realize a sustainable low carbon society, it is necessary to disseminate cars of low carbon emission such as electric vehicles (EV) and plug-in hybrid vehicles (PHEV), as well as to introduce renewable energy and stationary storage systems.

 The development target for the energy density of batteries for EV is 500 Wh/kg or higher by 2030 (NEDO Battery RM2013 (August 2013)). It is widely acknowledged however, that conventional lithium ion batteries (LIB) will fail to meet this target. In this proposal, the manufacturing cost of a lithium-sulfur battery, which is regarded as a promising next-generation battery due to its high theoretical energy density, was studied based on the present technology and forecasts for future technology. The results revealed that the manufacturing cost of lithium sulfur batteries is likely to fall from 22.6 JPY/ Wh at present to 6.7 JPY/ Wh by 2030, while the energy density is expected to reach 530 Wh/kg by that time. In addition, technological obstacles to reducing the manufacturing cost were discussed based on the evaluation results.

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