Effects of surface lithiated TiO2 nanorods on room-temperature properties of polymer solid electrolytes |
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Authors: | Song Hua Jia-lun Li Mao-xiang Jing Fei Chen Bo-wei Ju Fei-yue Tu Xiang-qian Shen Shi-biao Qin |
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Affiliation: | 1. Institute for Advanced Materials, Jiangsu University, Zhenjiang, China;2. Institute for Advanced Materials, Changsha Research Institute of Mining and Metallurgy, Co., Ltd, Changsha, China |
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Abstract: | Polymer solid electrolyte with high ionic conductivity at room-temperature is most likely to be widely used in solid-state lithium batteries. In this work, the novel surface lithiated TiO2 nanorods were firstly used as ionic conductor in polymer solid electrolyte. The surface lithiated TiO2 nanorods-filled polypropylene carbonate polymer composite solid electrolyte (CSE) has an uniform composite structure with a thickness of about 60 μm. The ionic conductivity at room-temperature is 1.21 × 10?4 S cm?1 and the electrochemical stability window is up to 4.6 V (vs Li+/Li). The assembled NCM622/CSE/Li solid-state battery shows a stable cycle performance with a retention capacity of 120 mAh g?1 after 200 cycles at the current density of 0.3 C and a high coulomb efficiency of 99%. Compared with TiO2 particles, this novel surface lithiated TiO2 nanorods can provide more continuous ion transport channels and more Lewis acid-base reactive sites, provide a novel way to enhance the lithium ion transport in polymer solid electrolyte. |
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Keywords: | composite solid electrolyte ionic conductivity room temperature performance surface lithiation TiO2 nanorod |
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