Stability of polymeric separators in lithium metal batteries in a low voltage environment,Journal of Materials Chemistry A

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Stability of polymeric separators in lithium metal batteries in a low voltage environment
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-02-27 00:00:00 , DOI: 10.1039/c7ta11259a
Xing Li _{1,

2,

3,

4,

5} , Jinhui Tao _{2,

3,

4,

6} , Dehong Hu _{2,

3,

4,

7} , Mark H. Engelhard _{2,

3,

4,

7} , Wengao Zhao _{1,

2,

3,

4,

8} , Ji-Guang Zhang _{1,

2,

3,

4} , Wu Xu _{1,

2,

3,

4}

Affiliation

The separator is an important component in rechargeable lithium (Li) metal batteries; however, less attention has been focused on it so far. In this work, several representative separators based on polyolefins without and with ceramic and polymeric coatings were selected to study the stability of separators against Li metal anode in Li‖Cu and Li‖Li coin cells in a low voltage environment less than 1 V vs. Li/Li⁺. Moreover, two representative electrolytes of LiPF₆ and LiTFSI–LiBOB in a carbonate solvent mixture were also employed to systematically study their interactions with separators in Li metal cells. It was found that separators could largely affect the coulombic efficiency and cycling stability of Li metal cells, especially when using the LiPF₆ electrolyte, which is probably due to the effect of the trace amount of HF in the LiPF₆ electrolyte. Among these separators, polyethylene separator is the most stable one with Li metal while ceramic and polysiloxy coating layers are not stable with Li metal in the presence of the LiPF₆ electrolyte. This work gave more insights into the above phenomena, which could provide references for Li metal battery studies when employing Li‖Cu and Li‖Li cells in a low voltage environment.

中文翻译：

锂金属电池中聚合物隔膜在低压环境下的稳定性

隔板是可再充电锂（Li）金属电池中的重要组件。但是，到目前为止，对此的关注较少。在这项工作中，选择了几种具有代表性的，不带和带有陶瓷和聚合物涂层的，基于聚烯烃的隔膜，以研究隔膜在小于1 V vs.的低压环境下，对Li'Cu和Li'Li纽扣电池中的Li金属阳极的稳定性。Li / Li ⁺。此外，在碳酸盐溶剂混合物中，还使用了LiPF ₆和LiTFSI-LiBOB的两种代表性电解质，系统地研究了它们与锂金属电池中隔板的相互作用。发现隔板会极大地影响锂金属电池的库仑效率和循环稳定性，特别是在使用LiPF时₆电解质，这可能是由于LiPF₆电解质中微量的HF的影响。在这些隔膜中，聚乙烯隔膜是最稳定的锂金属隔膜，而在存在LiPF₆电解质的情况下，陶瓷和聚甲硅烷氧基涂层对锂金属却不稳定。这项工作为上述现象提供了更多的见识，可为在低压环境下使用Li'Cu和Li'Li电池的锂金属电池研究提供参考。

更新日期：2018-02-27

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