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RESEARCH

ENERGY STORAGE & CONVERSION MATERIALS LAB.

Next generation battery

Home Research Next generation battery

Fundamentals on Lithium-Sulfur battery

Li-S batteries are among the more auspicious candidates as next-generation batteries, owing to the abundance and inexpensive cost of raw sulfur, environmental benignity, theoretical capacity of 1675 mAh g-1 for sulfur cathodes, and theoretical energy density of 2500 Wh kg-1. Yet, in spite of their benefits, Li-S batteries have not been successfully commercialized so far, since they suffer from several problems: 1) Li-sulfides dissolution and their shuttle reactions that avoid full oxidation of the Li-sulfides to sulfur in the cathodes, 2) volatility of the conventional ether-based electrolyte solutions, and 3) only a partial utilization of sulfur at the cathodes due to the low sulfur conductivity of 5 x 10-30 S cm-1.

New-type cathode structure for high performances of Li-S battery :Nano-compacted Li2S/graphene composite cathode

A mixture of graphene and Li2S is pelletized by a volume reduction of 220% to synthesize a high energy density cathode for Li–S batteries. The pelletized Li2S/graphene cathode represents a breakthrough in Li−S battery technology, providing the high energy and high-power density promised by the technology, while ensuring the required battery lifetime. Which plots the gravimetric energy density against the active mass loading for the Li2S/carbon batteries reported in the literature and for the state-of-the-art commercial Li-ion battery. (Panasonic NCR18650B) At present, the cathode fabrication technology is applied to Sulfur and S-PAN as well as Li2S batteries.

Various type of sulfur cathode materials fabrication

With sulfur, Li2S and S-PAN, we are doing research on cathode materials of Li-S battery, and we are presenting achievements in all fields. Each positive electrode has different characteristics, and the development of Li-S battery, one of the next generation batteries, requires even development and comparative analysis in each cathode material.

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