A quasi-solid-state rechargeable cell with high energy and superior safety enabled by stable redox chemistry of Li2S in gel electrolyte,Energy & Environmental Science

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A quasi-solid-state rechargeable cell with high energy and superior safety enabled by stable redox chemistry of Li2S in gel electrolyte
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-12-24 , DOI: 10.1039/d0ee03037f
Xiangyu Meng _{1,

2,

3,

4,

5} , Yuzhao Liu _{1,

2,

3,

4,

5} , Zhiyu Wang _{1,

2,

3,

4,

5} , Yizhou Zhang _{1,

2,

3,

4,

5} , Xingyu Wang _{1,

2,

3,

4,

5} , Jieshan Qiu _{6,

7,

8,

9}

Affiliation

Recent years have witnessed a thriving pursuit of high-energy Li metal batteries for replacing the existing Li-ion batteries. However, the cell chemistry involving extremely reactive Li metal anodes in flammable organic liquid electrolytes raises serious problems in battery performance and safety. Herein, we report on achieving high energy and superior safety in a quasi-solid-state rechargeable cell design in terms of Li metal-free stable redox chemistry between a Li₂S cathode and Si anode in gel polymer electrolyte with favorable interfacial properties, ionic conductivity and robustness. This chemistry ensures intrinsically high safety even under extreme conditions by eliminating the uncontrolled exothermic chain reactions in the cells. A nanospace-confined bifunctional electrocatalytic adsorber is designed to minimize the diffusion restriction of the Li₂S cathode in the gel electrolyte, while the Si anode is strengthened by a multilevel hollow design. The obtained quasi-solid-state rechargeable Li₂S||Si full cells deliver a high specific energy of up to 802 W h kg_Li2S+Si⁻¹ with high durability, low self-discharge, and good temperature adaptability from −20 to 60 °C. Meanwhile, the cells exhibit excellent safety against mechanical damage, overheating and short circuit in the air or water, offering high reliability for practical use.

中文翻译：

通过凝胶电解质中Li2S的稳定氧化还原化学作用实现具有高能量和卓越安全性的准固态可充电电池

近年来，目睹了高能锂金属电池对替代现有锂离子电池的热烈追求。然而，在易燃有机液体电解质中涉及反应性极强的锂金属阳极的电池化学性质在电池性能和安全性方面提出了严重的问题。在此，我们报告了在准固态可充电电池设计中就Li ₂之间无锂金属的稳定氧化还原化学反应实现的高能量和更高的安全性凝胶聚合物电解质中的S阴极和Si阳极具有良好的界面性能，离子电导率和坚固性。通过消除细胞中不受控制的放热链反应，即使在极端条件下，这种化学作用也可确保本质上较高的安全性。设计了一种纳米空间受限的双功能电催化吸附剂，以最大程度地减小Li ₂ S阴极在凝胶电解质中的扩散限制，同时通过多层空心设计来增强Si阳极。所获得的准固态可充电Li ₂ S || Si全电池可提供高达802 W h kg _{Li2S + Si}^-1的高比能具有高耐用性，低自放电以及在-20至60°C的温度范围内具有良好的适应性。同时，电池对机械损伤，过热以及空气或水中的短路表现出极好的安全性，为实际使用提供了很高的可靠性。

更新日期：2020-12-24

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