Lithium Sulfur Battery: Current Status and Future Prospects. Dr. Toru Hara 1,2,3 Mr. Aishuak Konarov 1 Dr. Almagul Mentbayeva 1,3 Dr. Indira Kurmanbayeva.

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Lithium Sulfur Battery: Current Status and Future Prospects. Dr. Toru Hara 1,2,3 Mr. Aishuak Konarov 1 Dr. Almagul Mentbayeva 1,3 Dr. Indira Kurmanbayeva 1 Prof. Zhumabay Bakenov 1,2,3 1 Institute of Batteries 2 Nazarbayev University Research and Innovation System 3 Nazarbayev University Ministry of Education and Science of Republic of Kazakhstan

Lithium Sulfur Battery: Current Status and Future Prospects. This publication has been made within the Sub-project # which is funded under the Technology Commercialization Project, supported by the World Bank and the Government of the Republic of Kazakhstan. Ministry of Education and Science of Republic of Kazakhstan

MaterialTheoretical Capacity (mAh/g) Available capacity (mAh/g) Cost/capacity (USD/kAh) Graphite LiCoO Sulfur  Motivation for Research: Sulfur is almost free. Price:

Challenging issues Li dendrite growth at Li metal anodeShort circuit failure Insulating nature of sulfur Low utilization of sulfur (low capacity) Low mass-loading of sulfur (≤ 2 mg/cm 2 )Low capacity Polysulfides dissolutionCapacity fading

Challenging issuesSolutions Li dendrite growthPre-lithiation of anode Insulating natureConducting agent Low mass-loading (≤ 2mg/cm 2 ) high specific-area carbon- based current collector Polysulfides dissolutionStabilizing agent

Challenging issuesSolutions Li dendrite growthPre-lithiation of anode Short-circuiting anode materials to Li metal foil before assembly R. Koksbang, I. Olsen, and J. Barker, U.S. Patent 5,753,388 A, Apr 12, A. Zhamu and B. Z. Jang, U.S. Patent 8,158,282 B2, Nov 13, Li foil Anode Electrolyte solution

Challenging issuesSolutions Li dendrite growthPre-lithiation of anode Voltage profile and cycle performance of pre-lithiated graphite (10.8-mg- graphite/cm 2, 4 mAh/cm 2 )|1 M LiPF 6 /EC+DEC+EMC (1/1/1, v/v/v)|S/PAN/KB (2-mg-sulfur/cm 2, 2.9 mAh/cm 2 ) cell at 0.2 C.

Challenging issuesSolutions Insulating natureConducting agent sulfur/poly(acrylonitrile) composite (S/PAN composite) Plus carbon black, acetylene black etc. J. Wang, J. Yang, J. Xie, and N. Xu, Adv. Mater., 14, 963 (2002). J. Wang, J. Yang, C. Wan, K. Du, J. Xie, and N. Xu, Adv. Funct. Mater., 13, 487 (2003).

Challenging issuesSolutions Insulating natureConducting agent nanostructures.html Cyclized poly(acrylonitrile)

Challenging issuesSolutions Low mass-loading high specific-area carbon- based current collector Cathode composite coating onto/into high specific-area carbon- based current collector

Challenging issuesSolutions Low mass-loading high specific-area carbon- based current collector Cycle performance of Li metal foil | 1.0 M LiPF 6 / EC+DEC+EMC (1/1/1, v/v/v) | S/PAN/KB (3-mg-sulfur/cm 2 ▪300 μm, 3.6 mAh/cm 2 ) cell at 0.2 C.

Challenging issuesSolutions Polysulfides dissolutionStabilizing agent Sulfur/poly(acrylonitrile) composite (S/PAN composite) cathode S/PAN can be used in LiPF 6 /carbonate-based electrolyte solutions; however, cycle life tends to be around cycles (depending on the mass-loading of sulfur, and on anode/cathode mass-loading ratio). Cycle life improvement is required.

Thank you all very much. From Kazakhstan with gratitude. Thank you Prof. Yongguang Zhang (Hebei University of Technology) for your great effort for initiating this project.