Slurry mixing for fabricating silicon-composite electrodes in all-solid-state
Slurry mixing for fabricating silicon-composite electrodes in all-solid-state
复制标题
制备全固态硅复合电极的浆料混合
DOI：
10.1016/j.jpowsour.2018.09.070
复制
发表时间：
2018
影响因子：
9.2
通讯作者：
Masanari Takahashi
中科院分区：
文献类型：
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作者：
Mari Yamamoto;Yoshihiro Terauchi;Atsushi Sakuda;Masanari Takahashi
包含硫化物固体电解质的全固态电池由于其安全记录而有希望用于电动车辆中的能量存储。对于可堆叠的紧凑片材形式的电池存在很高的需求，所述可堆叠的紧凑片材具有高的基于电池的能量密度，其在可扩展的工艺中大规模制造。浆料涂布对于制造片状电池是有利的，提高了生产率，并且允许控制层厚度。本文提出了一种制备含微米级硅颗粒的均匀分散复合材料的浆料混合方法。随后从堆叠的片状电池中去除挥发性粘合剂被证明可以降低它们的内阻。硅复合材料片表现出95%的高初始库仑效率，在0.30 mA cm-2下第47次循环时的实际面积容量为2.0-4.4 mAh cm-2，100次循环后的可逆比容量为2300 mAh g-1，以及长期循环稳定性（375次循环后的比容量高于1700 mAh g-1）。循环后垂直于硅复合层的裂纹缓冲了源自硅体积变化的内部应变，提供了优异的循环稳定性。这些结果可为高性能全固态电池硅阳极的合理设计提供参考。
All-solid-state batteries comprising sulfide solid electrolytes are promising for energy storage in electric vehicles because of their safety record. There is a high demand for batteries in the form of stackable compact sheets with high cell-based energy density that are mass fabricated in a scalable process. A slurry coating is advantageous for fabricating sheet-type batteries, improves productivity, and allows control of the layer thickness. Here we present a slurry-mixing method for fabricating homogeneously dispersed composite sheets containing micrometer-sized silicon particles. Subsequent removal of the volatile binder from the stacked-sheet cells is demonstrated to reduce their internal resistance. The silicon composite sheets exhibit high initial Coulombic efficiencies of 95%, with practical areal capacities of 2.0–4.4 mAh cm−2at the 47th cycle under 0.30 mA cm−2, a reversible specific capacity of 2300 mAh g−1after 100 cycles, and long-term cycling stability (specific capacity above 1700 mAh g−1after 375 cycles). Cracks that are vertical to the silicon composite layer after cycling buffer the internal strain originating from silicon volume changes, providing excellent cycling stability. These results can assist the rational design of silicon anodes for high-cell-performance all-solid-state batteries.