Amorphous Li–Si–Ti–P–O (LSTP) thin film electrolyte was successfully prepared by radio frequency magnetron sputtering using Li 1.4 Si 0.4 Ti 1.6 (PO 4 ) 3 powder targets and stainless steel sheet as substrate. The effects of sputtering power on the structure, morphology, ionic conductivity, and electronic conductivity of the LSTP thin film electrolyte were investigated. The results showed that the LSTP thin film electrolyte obtained with sputtering power kept at 160 W, displayed uniform particles compacted in arrangement, proper stoichiometric ratio to the powder target as well as sufficient Li-ion for diffusion. Hence, it held a considerable ionic conductivity of 4.12 × 10 −6 S cm −1 and a high σ ion / σ ele ratio about 8 magnitudes, indicating that it can be used as film electrolyte in all-solid-state lithium batteries.
Wang Zhen-yu,Li Cong,Huang Ying-de,He Zhen-jiang,Yan Cheng,Mao Jing,Dai Ke-hua,Zheng Jun-chao
With increasing demand on energy density of lithium-ion battery, wide electrochemical window and safety performance are the crucial request for next generation electrolyte. Gel-electrolyte as a pioneer for electrolyte solidization development aims to solve the safety and electrochemical window problems. However, low ionic conductivity and poor physical performance prohibit its further application. Herein, a fast-ionic conductor (Li 2.64 (Sc 0.9 Ti 0.1 ) 2 (PO 4 ) 3 ) (LSTP) was added into poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) base gel-electrolyte to enhance mechanical properties and ionic conductivity. Evidences reveal that LSTP was able to weaken interforce between polymer chains, which increased the ionic conductibility and decreased interface resistance during the cycling significantly. The obtained LiFePO 4 /hybrid gel-electrolyte/Li-metal coin cell exhibited excellent rate capacity (145 mA·h/g at 1 C , 95 mA·h/g at 3 C , 28 °C) which presented a potential that can be comparable with commercialized liquid electrolyte system.
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