Dual Play of Chitin‐Derived N‐Doped Carbon Nanosheets Enabling High‐Performance Na‐SeS2 Half/Full Cells,Batteries & Supercaps

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Dual Play of Chitin‐Derived N‐Doped Carbon Nanosheets Enabling High‐Performance Na‐SeS2 Half/Full Cells
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-01-02 , DOI: 10.1002/batt.201900159
Jingqi Ma _{1,

2} , Lingfeng Gao ₃ , Shuping Li _{1,

2} , Ziqi Zeng ₁ , Lina Zhang ₃ , Jia Xie ₁

Affiliation

Room‐temperature Na−S batteries hold great promise for developing next‐generation battery system with the advantages of abundant resource, high energy density, and long lifetime. However, limited by sluggish kinetics, Na−S batteries frequently suffer from low utilization of active materials, rapid capacity decay during cycling and poor rate capability. Herein, we propose an advanced cathode with SeS₂ tightly impregnated in chitin‐derived rich nitrogen carbon nanosheets (termed as CCN/SeS₂). The CCN/SeS₂ exhibits superb rate capability (422 mAh g⁻¹ at 5 A g⁻¹) and long cycle stability (566 mAh g⁻¹ after 470 cycles with a capacity decay rate of 0.056 % per cycle). High content and high loading cathodes are also fabricated to meet the requirement of practical application. The results of electrochemical tests and characterization demonstrate that CCN/SeS₂ has preponderance in lowering overpotential and reaction resistances, prompting the diffusion of sodium ions and achieving the uniform deposition of discharge products. For the first time, a full cell based on all‐chitin materials (CCN/SeS₂ cathode and CCN anode) is assembled, which exhibits favorable cycling performance over 100 cycles. The as‐obtained cell using a green and low‐cost carbon and SeS₂ inheriting the advantages of Se and S may pave a new way to energy storage.

中文翻译：

甲壳素衍生的N掺杂碳纳米片的双重作用，可实现高性能Na-SeS2半/全电池

室温Na-S电池具有资源丰富，能量密度高和寿命长的优点，对开发下一代电池系统具有广阔的前景。但是，受动力学迟缓的限制，Na-S电池经常遭受活性物质利用率低，循环过程中容量快速衰减和速率能力差的困扰。在本文中，我们提出了一种先进的阴极，其SeS ₂紧密浸渍在几丁质衍生的富氮碳纳米片中（称为CCN / SeS ₂）。在CCN / SES _2个展品高超速率能力（422毫安克^-1在5 A G ^-1）和长周期稳定性（566毫安克^-1470次循环后，每循环的容量衰减率为0.056％）。还制造了高含量和高负载的阴极以满足实际应用的要求。电化学测试和表征的结果表明，CCN / SeS ₂在降低过电势和反应电阻，促进钠离子扩散和实现放电产物的均匀沉积方面具有优势。首次组装了基于全壳多糖材料的完整电池（CCN / SeS ₂阴极和CCN阳极），在100个循环中表现出良好的循环性能。如此获得的使用绿色低成本碳和SeS ₂的电池继承了Se和S的优势，可能为能量存储铺平了道路。

更新日期：2020-01-02

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