An Aqueous Inorganic Polymer Binder for High Performance Lithium–Sulfur Batteries with Flame-Retardant Properties,ACS Central Science

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An Aqueous Inorganic Polymer Binder for High Performance Lithium–Sulfur Batteries with Flame-Retardant Properties
ACS Central Science ( IF 12.7 ) Pub Date : 2018-02-14 00:00:00 , DOI: 10.1021/acscentsci.7b00569
Guangmin Zhou ₁ , Kai Liu ₁ , Yanchen Fan ₂ , Mengqi Yuan ₃ , Bofei Liu ₁ , Wei Liu ₁ , Feifei Shi ₁ , Yayuan Liu ₁ , Wei Chen ₁ , Jeffrey Lopez ₄ , Denys Zhuo ₁ , Jie Zhao ₁ , Yuchi Tsao ₁ , Xuanyi Huang ₁ , Qianfan Zhang ₂ , Yi Cui _{1,

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Affiliation

Lithium–sulfur (Li–S) batteries are regarded as promising next-generation high energy density storage devices for both portable electronics and electric vehicles due to their high energy density, low cost, and environmental friendliness. However, there remain some issues yet to be fully addressed with the main challenges stemming from the ionically insulating nature of sulfur and the dissolution of polysulfides in electrolyte with subsequent parasitic reactions leading to low sulfur utilization and poor cycle life. The high flammability of sulfur is another serious safety concern which has hindered its further application. Herein, an aqueous inorganic polymer, ammonium polyphosphate (APP), has been developed as a novel multifunctional binder to address the above issues. The strong binding affinity of the main chain of APP with lithium polysulfides blocks diffusion of polysulfide anions and inhibits their shuttling effect. The coupling of APP with Li ion facilitates ion transfer and promotes the kinetics of the cathode reaction. Moreover, APP can serve as a flame retardant, thus significantly reducing the flammability of the sulfur cathode. In addition, the aqueous characteristic of the binder avoids the use of toxic organic solvents, thus significantly improving safety. As a result, a high rate capacity of 520 mAh g^–1 at 4 C and excellent cycling stability of ∼0.038% capacity decay per cycle at 0.5 C for 400 cycles are achieved based on this binder. This work offers a feasible and effective strategy for employing APP as an efficient multifunctional binder toward building next-generation high energy density Li–S batteries.

中文翻译：

一种具有阻燃特性的高性能锂硫电池水性无机聚合物粘结剂

锂硫（Li–S）电池因其高能量密度，低成本和环境友好性而被认为是适用于便携式电子产品和电动汽车的下一代高能量密度存储设备。然而，由于硫的离子绝缘性质以及电解质中多硫化物的溶解以及随后的寄生反应导致硫利用率低和循环寿命差，仍然存在一些尚待充分解决的主要挑战。硫的高易燃性是另一个严重的安全隐患，阻碍了其进一步应用。在本文中，已经开发了水性无机聚合物多磷酸铵（APP）作为新型多功能粘合剂以解决上述问题。APP主链与多硫化锂的强结合亲和力阻止了多硫化物阴离子的扩散并抑制了它们的穿梭作用。APP与Li离子的偶联促进离子转移并促进阴极反应的动力学。此外，APP可以用作阻燃剂，从而大大降低了硫阴极的可燃性。另外，粘合剂的水性特征避免了使用有毒的有机溶剂，从而显着提高了安全性。结果是520 mAh g的高倍率容量另外，粘合剂的水性特征避免了使用有毒的有机溶剂，从而显着提高了安全性。结果是520 mAh g的高倍率容量另外，粘合剂的水性特征避免了使用有毒的有机溶剂，从而显着提高了安全性。结果是520 mAh g的高倍率容量基于这种粘合剂，在4 C时为^–1，在0.5 C下可实现400个循环的每循环约0.038％容量衰减的出色循环稳定性。这项工作为将APP用作构建下一代高能量密度Li–S电池的高效多功能粘合剂提供了可行而有效的策略。

更新日期：2018-02-14

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