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Preparation of a Self‐Supported SiO2 Membrane as a Separator for Lithium‐Ion Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-02-03 , DOI: 10.1002/batt.201900169 Neil Amponsah Kyeremateng 1, 2 , Dion Gukte 3 , Marc Ferch 1 , Jan Buk 4 , Tomas Hrebicek 4 , Robert Hahn 3
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-02-03 , DOI: 10.1002/batt.201900169 Neil Amponsah Kyeremateng 1, 2 , Dion Gukte 3 , Marc Ferch 1 , Jan Buk 4 , Tomas Hrebicek 4 , Robert Hahn 3
Affiliation
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For the first time, electrophoretic deposition (EPD) has been employed to prepare a self‐supported, inorganic membrane consisting of SiO2 nano‐fibers, as a separator for lithium‐ion batteries. The SiO2 nano‐fibers that were fabricated by a low‐cost force spinning technique were deposited by EPD directly onto LiNi0.8Co0.15Al0.05O2 cathode material. Citric acid charging agent and anhydrous acetone solvent were used. The resulting porosity and tortuosity of the EPD SiO2 separator were 71.42 %, and 1.70, respectively. The slightly higher tortuosity of the EPD‐SiO2‐fiber separator (60 μm) led to a lower rate capability in comparison to commercial GF/A glass fiber separator (260 μm). On the other hand, the latter exhibited lower self‐discharge than the former in full‐cells with a graphite anode; this is proposed to be related to the different purities of the two materials that impart different electronic properties or the presence of 20 wt % PVDF in the EPD‐SiO2 separator. Indeed, the deposited membrane has good characteristics as a battery separator and the EPD process is extremely feasible for the fabrication of miniaturized lithium‐ion batteries on wafer level.
中文翻译：
制备自支撑式SiO2膜作为锂离子电池的隔膜
电泳沉积（EPD）首次用于制备由SiO 2纳米纤维组成的自支撑无机膜，作为锂离子电池的隔膜。EPD将采用低成本强制纺丝技术制造的SiO 2纳米纤维直接沉积在LiNi 0.8 Co 0.15 Al 0.05 O 2正极材料上。使用柠檬酸充电剂和无水丙酮溶剂。EPD SiO 2隔板的孔隙率和曲折度分别为71.42％和1.70。EPD-SiO 2的曲折度稍高与商用GF / A玻璃纤维分离器（260μm）相比，纤维分离器（60μm）导致较低的倍率能力。另一方面，在带有石墨阳极的全电池中，后者的自放电要比前者低。有人认为这与两种材料的纯度不同有关，这两种材料具有不同的电子性能，或者在EPD-SiO 2隔膜中存在20 wt％的PVDF 。的确，沉积的膜具有良好的电池隔离特性，而EPD工艺对于在晶圆级制造微型锂离子电池极为可行。
更新日期：2020-02-03
中文翻译：
制备自支撑式SiO2膜作为锂离子电池的隔膜
电泳沉积（EPD）首次用于制备由SiO 2纳米纤维组成的自支撑无机膜，作为锂离子电池的隔膜。EPD将采用低成本强制纺丝技术制造的SiO 2纳米纤维直接沉积在LiNi 0.8 Co 0.15 Al 0.05 O 2正极材料上。使用柠檬酸充电剂和无水丙酮溶剂。EPD SiO 2隔板的孔隙率和曲折度分别为71.42％和1.70。EPD-SiO 2的曲折度稍高与商用GF / A玻璃纤维分离器（260μm）相比，纤维分离器（60μm）导致较低的倍率能力。另一方面，在带有石墨阳极的全电池中，后者的自放电要比前者低。有人认为这与两种材料的纯度不同有关，这两种材料具有不同的电子性能，或者在EPD-SiO 2隔膜中存在20 wt％的PVDF 。的确，沉积的膜具有良好的电池隔离特性，而EPD工艺对于在晶圆级制造微型锂离子电池极为可行。
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