Deriving Structure‐Performance Relations of Chemically Modified Chitosan Binders for Sustainable High‐Voltage LiNi0.5Mn1.5O4 Cathodes,Batteries & Supercaps

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Deriving Structure‐Performance Relations of Chemically Modified Chitosan Binders for Sustainable High‐Voltage LiNi0.5Mn1.5O4 Cathodes
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2019-11-12 , DOI: 10.1002/batt.201900140
Matthias Kuenzel _{1,

2} , Regis Porhiel _{1,

2} , Dominic Bresser _{1,

2} , Jakob Asenbauer _{1,

2} , Peter Axmann ₃ , Margret Wohlfahrt‐Mehrens _{1,

3} , Stefano Passerini _{1,

2}

Affiliation

The implementation of aqueous electrode processing for lithium‐ion positive electrodes is key towards the realization of environmentally benign and cheap battery production. One of the water‐soluble binders that has attracted most attention is chitosan, the second‐most abundant natural biopolymer. Herein, the use of chitosan for high‐voltage, cobalt‐free LiNi_0.5Mn_1.5O₄ cathodes is reported for the first time. A detailed comparison of three different grades of chitosan with varying chain length and degrees of deacetylation (DD) is provided to explore the impact of these properties on the electrochemical performance. In fact, bio‐derived chitosan with a relatively lower DD outperforms synthetic chitosan‐especially after crosslinking with citric acid‐yielding about 10 % higher capacities. Higher molecular weight appears additionally advantageous for the cycling stability. Finally, guar gum is employed as slurry thickener, co‐crosslinking with chitosan. This allows for achieving 50 % higher mass loadings than for chitosan only and stable capacities above 130 and 120 mAh g⁻¹ at C/3 and 1 C, respectively.

中文翻译：

化学改性壳聚糖粘合剂的结构-性能关系用于可持续高压LiNi0.5Mn1.5O4阴极

对锂离子正极进行水电极处理是实现对环境无害且廉价的电池生产的关键。壳聚糖是最受关注的水溶性粘合剂之一，壳聚糖是第二多的天然生物聚合物。在此，壳聚糖在高压无钴LiNi _0.5 Mn _1.5 O _4中的用途阴极是第一次报道。提供了三种不同等级的壳聚糖（链长和脱乙酰度（DD）不同）的详细比较，以探讨这些性质对电化学性能的影响。实际上，DD相对较低的生物衍生壳聚糖优于合成壳聚糖，尤其是在与柠檬酸交联后，其产能提高了约10％。更高的分子量似乎对于循环稳定性也有利。最后，瓜尔胶被用作浆料增稠剂，与壳聚糖共交联。与仅使用壳聚糖相比，这可实现50％的更高质量负载，并分别在C / 3和1 C时在130 mAh g ^-1和120 mAh g ^-1以上具有稳定的容量。

更新日期：2019-11-13

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