Chelating-Type Binders toward Stable Cycling and High-Safety Transition-Metal Sulfide-Based Lithium Batteries,ACS Energy Letters

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Chelating-Type Binders toward Stable Cycling and High-Safety Transition-Metal Sulfide-Based Lithium Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-09-13 , DOI: 10.1021/acsenergylett.4c01907
Hongyu Liu _{1,

2} , Zhenrui Wu ₃ , Hao Wang ₁ , Xiaobin Niu ₁ , Hong Li _{2,

4} , Liping Wang ₁

Affiliation

Conversion-type transition-metal sulfides (MS_x) are considered promising cathodes due to their low cost, easy availability, and high energy density. However, MS_x cathodes experience severe capacity decay when cycling in conventional carbonate-based electrolytes because of irreversible nucleophilic reactions between carbonate solvents and polysulfide intermediates. To address this issue, a series of chelating-type binders has been designed for enabling MS_x to function effectively. As a result, a typical transition-metal sulfide FeS₂ cathode can work reversibly with a high capacity of 527.3 mAh g^–1 over 300 cycles, retaining 76.9% capacity under an ultrahigh loading of 5.6 mAh cm^–2. Additionally, a new type of battery featuring FeS₂ cathodes coupled with LiC₆ anodes in carbonate electrolyte has been developed for high stability (72.0% retention after 300 cycles) and safety. This work demonstrates the potential of conversion-type lithium batteries for achieving long cycle life and high safety.

中文翻译：

用于稳定循环和高安全性过渡金属硫化物锂电池的螯合型粘合剂

转化型过渡金属硫化物（MS _x ）因其成本低、易于获得和高能量密度而被认为是有前途的阴极。然而，由于碳酸酯溶剂和多硫化物中间体之间发生不可逆的亲核反应，MS _x阴极在传统碳酸酯基电解质中循环时会经历严重的容量衰减。为了解决这个问题，我们设计了一系列螯合型粘合剂，使 MS _x能够有效发挥作用。结果，典型的过渡金属硫化物FeS ₂正极可以可逆工作，在300次循环后具有527.3 mAh g ^–1的高容量，在5.6 mAh cm ^–2的超高负载下保持76.9%的容量。此外，还开发了一种新型电池，采用碳酸盐电解质中的 FeS ₂阴极与 LiC ₆阳极相结合，具有高稳定性（300 次循环后保留率为 72.0%）和安全性。这项工作展示了转换型锂电池实现长循环寿命和高安全性的潜力。

更新日期：2024-09-13

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