Supporting Information

Enhanced electrochemical performance from cross-linked polymeric

network as binder for Li-S battery cathodes

Shaoyin zhua, Jiaojiao Yua, Xiao Yana, Erqing Zhaoa, Yanqing Wanga, Deye Suna, Yongcheng Jina*, Kiyoshi Kanamurab*

a CAS Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China

Fax/Tel: +86-532-8066-2703; E-mail: jinyc@qibebt.ac.cnb Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan, Fax/Tel: +81-42-677-2828; Email:kanamura@tmu.ac.jp

1. Photographs show of the prepared sulfur cathode

Fig.S1 Photographs show of sulfur cathode with Alg as binder.

2. SEM images

Fig. S2 SEM images of initial sulfur cathode with PVDF with high resolution.

3. Electrochemical properties investigation

Fig. S3 Rate capabilities (a) and cycle performances (b) of sulfur cathodes with Alg, PVDF, and Alg-Ca2+ as binder, respectively.