Ionically cross-linked PEDOT:PSS as a multi-functional conductive binder for high-performance lithium–sulfur batteries†,Sustainable Energy & Fuels

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Ionically cross-linked PEDOT:PSS as a multi-functional conductive binder for high-performance lithium–sulfur batteries†
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2018-04-23 00:00:00 , DOI: 10.1039/c8se00167g
Longlong Yan _{1,

2,

3,

4,

5} , Xiguang Gao _{1,

2,

3,

4,

5} , Joseph Palathinkal Thomas _{3,

4,

5,

6} , Jenner Ngai _{1,

2,

3,

4,

5} , Haig Altounian _{1,

2,

3,

4,

5} , Kam Tong Leung _{3,

4,

5,

6} , Yuezhong Meng _{7,

8,

9,

10,

11} , Yuning Li _{1,

2,

3,

4,

5}

Affiliation

Despite their very high theoretical specific capacity, lithium–sulfur (Li–S) batteries still face issues such as low sulfur utilization and poor long-term cycling stability due to the low conductivity of sulfur, lithium polysulfide shuttle effect and large volume change during discharge–charge processes. This work uses a novel multi-functional polymer binder, PEDOT:PSS-Mg²⁺, to address the above issues. First, PEDOT:PSS is a highly conductive polymer, which improves the conductivity of the cathode composite. Second, cross-linking of PEDOT:PSS with Mg²⁺ forms a robust network that is able to endure the drastic volume change of the cathode during discharge/charge. Third, the abundant oxygen atoms present in PEDOT:PSS strongly interact with lithium polysulfides to suppress the shuttle effect. Li–S batteries with this new binder showed high initial specific capacity of up to 1097 mA h g⁻¹ and high capacity retention of up to 74% after 250 cycles at 0.5C with a sulfur content of 70 wt% in the cathode, which are significant improvements compared with the corresponding Li–S batteries with a conventional PVDF binder. Additionally, preparation of the cathode material with this new binder uses water as the solvent, avoiding the use of toxic organic solvents such as N-methylpyrrolidone (NMP).

中文翻译：

离子交联的PEDOT：PSS作为高性能锂硫电池的多功能导电粘合剂†

尽管锂-硫（Li-S）电池具有很高的理论比容量，但由于硫的电导率低，多硫化锂的穿梭效应以及放电过程中的体积变化较大，因此仍然面临诸如硫利用率低和长期循环稳定性差的问题。 –充电过程。这项工作使用了一种新型的多功能聚合物粘合剂PEDOT：PSS-Mg ²⁺来解决上述问题。首先，PEDOT：PSS是一种高导电性聚合物，可提高阴极复合材料的电导率。第二，PEDOT：PSS与Mg ^2+的交联形成一个坚固的网络，该网络能够承受放电/充电过程中阴极的急剧体积变化。第三，PEDOT：PSS中存在的大量氧原子与多硫化锂强烈相互作用，从而抑制了穿梭效应。使用这种新粘合剂的Li–S电池在0.5C下250次循环后，初始比容量高达1097 mA hg ^-1，高容量保持率高达74％，阴极中的硫含量为70 wt％。与使用传统PVDF粘合剂的相应Li–S电池相比，有了显着的改进。另外，用这种新的粘合剂制备阴极材料时，用水作为溶剂，避免使用有毒的有机溶剂，例如N-甲基吡咯烷酮（NMP）。

更新日期：2018-04-23

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