Robust Solid Electrolyte Interphases in Localized High Concentration Electrolytes Boosting Black Phosphorus Anode for Potassium-Ion Batteries,ACS Nano

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Robust Solid Electrolyte Interphases in Localized High Concentration Electrolytes Boosting Black Phosphorus Anode for Potassium-Ion Batteries
ACS Nano ( IF 15.8 ) Pub Date : 2021-10-11 , DOI: 10.1021/acsnano.1c07414
Xiaoqiong Du ₁ , Biao Zhang ₁

Affiliation

Black phosphorus (BP) shows superior capacity toward K ion storage, yet it suffers from poor reversibility and fast capacity degradation. Herein, a BP-graphite (BP/G) composite with a high BP loading of 80 wt % is synthesized and stabilized via the utilization of a localized high concentration electrolyte (LHCE), i.e., potassium bis(fluorosulfonyl)imide in trimethyl phosphate with a fluorinated ether as the diluent. We reveal the benefits of high concentration electrolytes rely on the formation of an inorganic component rich solid electrolyte interphase (SEI), which effectively passivates the electrode from copious parasite reactions. Furthermore, the diluent increases the electrolyte’s ionic conductivity for achieving attractive rate capability and homogenizes the elemental distribution in the SEI. The latter essentially improves the SEI’s maximum elastic deformation energy for accommodating the volume change, resulting in excellent cyclic performance. This work promotes the application of advanced potassium-ion batteries by adopting high-capacity BP anodes, on the one hand. On the other hand, it unravels the beneficial roles of LHCE in building robust SEIs for stabilizing alloy anodes.

中文翻译：

局部高浓度电解质中的坚固固体电解质中间相促进钾离子电池的黑磷阳极

黑磷 (BP) 显示出优异的 K 离子存储能力，但其可逆性差且容量衰减快。在此，通过利用局部高浓度电解质（LHCE）合成并稳定了具有 80 wt% BP 负载量的 BP-石墨（BP/G）复合材料，即, 双（氟磺酰基）亚胺钾的磷酸三甲酯溶液，用氟化醚作为稀释剂。我们揭示了高浓度电解质的好处依赖于富含无机成分的固体电解质中间相 (SEI) 的形成，这有效地钝化了电极，使其免受大量寄生虫反应的影响。此外，稀释剂增加了电解质的离子电导率以实现有吸引力的倍率能力并使 SEI 中的元素分布均匀。后者从本质上提高了 SEI 适应体积变化的最大弹性变形能，从而产生了优异的循环性能。这项工作一方面通过采用高容量BP负极促进了先进钾离子电池的应用。另一方面，

更新日期：2021-10-26

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