Journal of Physical Chemistry & Biophysics
Open Access
ISSN: 2161-0398
+44 1478 350008
ISSN: 2161-0398
+44 1478 350008
Yongmin Wu, Tao Wang, Xiangyang Kong, Yi Sun, Bin Shi and Kai Zhu
Tsinghua University, China
Posters & Accepted Abstracts: J Phys Chem Biophys
With the rapid development of new energy resources industry, brings ongoing demand for high energy density lithium battery. All solid state lithium battery, which uses inflammable solid electrolytes to replace flammable liquid electrolytes, is expected to be a promising route to solving the safety issues of high energy density lithium battery. Poly(ethylene oxide) (PEO) based materials are widely considered as promising candidates of polymer hosts in solid-state electrolytes, however, its ionic conductivity has to be improve to meet the production requirement. Considering the dissociation ability of the lithium salt in the polymer plays a decisive role for the number of free ions and hence to improve lithium ion transport transmission. LiI as well as LiTFSI and Al2O3, as additives, were added in PEO electrolytes under acetonitrile solution. The ion conductivity of prepared electrolyte can reach 1.18X10-3 S/cm, which was 5 times than the sample without LiI. The transfer number of prepared electrolyte was 0.47. The all solid-state lithium battery was fabricated with LiFePO4 as cathode with the prepared electrolyte as binder. The LiI was supplied as reversible capacity for battery from the CV curve and charging and discharging curve. The cell test shows the discharge specific capacity was maintained 170 mAh/g and during 100 cycles with the columbic efficiency retained above 95%.
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