Long‐Life and High‐Power Binder‐Free Cathode Based on One‐Step Synthesis of Radical Polymers with Multi‐Pendant Groups,Macromolecular Rapid Communications

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Long‐Life and High‐Power Binder‐Free Cathode Based on One‐Step Synthesis of Radical Polymers with Multi‐Pendant Groups
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2018-05-16 , DOI: 10.1002/marc.201800195
Yaoguang Chen ₁ , Yangfan Zhang ₁ , Xiu Liu ₁ , Xuliang Fan ₁ , Bing Bai ₁ , Kang Yang ₁ , Zhongxin Liang ₁ , Zishou Zhang ₁ , Kancheng Mai ₁

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The main bottlenecks for the widespread application of radical polymers in organic radical batteries are poor cycling stability, due to the dissolution of radical polymers into the electrolyte, and the low efficiency of multi‐step synthesis strategies. Herein, a kind of electrolyte‐resistant radical polymer bearing multi‐pendant groups (poly(ethylene‐alt‐TEMPO maleate) (PETM)) is designed and synthesized through a one‐step esterification reaction to graft 4‐hydroxy‐2,2,6,6‐teramethylpiperidinyl‐1‐oxy into the commercially available poly(ethylene‐alt‐maleic anhydride). Interestingly, PETM is hardly soluble in the ethylene carbonate/dimethyl carbonate/ethyl methyl carbonate‐based electrolyte, showing an extremely low solubility of 0.59 mg mL^–1, but is easily soluble in tetrahydrofuran and N‐Methyl pyrrolidone. The derived binder‐free PETM cathode exhibits nearly 100% utilization of the grafted nitroxide radicals (88 mA h g^–1) and excellent rate capability with almost invariant capacitance from 10 C to 40 C. Significantly, the PETM cathodes retain 94% of the initial capacity after 1000 cycles, outperforming most reported radical polymer‐based cathodes.

中文翻译：

基于多端基自由基聚合物一步合成的长寿命高功率无粘结剂阴极

自由基聚合物在有机自由基电池中广泛应用的主要瓶颈是，由于自由基聚合物溶解在电解质中，循环稳定性差，以及多步合成策略的效率低。本文设计并通过一步酯化反应合成接枝4-羟基-2,2的一种带有多侧链基团的耐电解质自由基聚合物（聚（乙烯-TEMPO马来酸酯）（PETM）），将6,6-叔甲基哌啶基-1-氧基转变成市售的聚（乙烯-取代-马来酸酐）。有趣的是，PETM几乎不溶于碳酸亚乙酯/碳酸二甲酯/碳酸乙基甲基酯类电解质，溶解度极低，为0.59 mg mL ^–1，但易溶于四氢呋喃和N-甲基吡咯烷酮。衍生的不含粘合剂的PETM阴极显示出接枝的氮氧化物自由基（88 mA hg ^–1）的利用率接近100％，并且具有极好的速率能力，并且电容在10 C至40 C几乎不变。重要的是，PETM阴极保留了94％的初始1000次循环后的容量，优于大多数报道的基于自由基聚合物的阴极。

更新日期：2018-05-16

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