Potassium‐Ion Storage in Cellulose‐Derived Hard Carbon: The Role of Functional Groups,Batteries & Supercaps

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Potassium‐Ion Storage in Cellulose‐Derived Hard Carbon: The Role of Functional Groups
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-06-21 , DOI: 10.1002/batt.202000116
Ashok Kumar Nanjundan _{1,

2,

3} , Rohit Ranganathan Gaddam ₁ , Amir H. Farokh Niaei ₂ , Pratheep K. Annamalai ₂ , Deepak P. Dubal ₃ , Darren James Martin _{1,

2} , Yusuke Yamauchi _{1,

2,

4} , Debra J. Searles _{2,

5} , Xiu Song Zhao ₁

Affiliation

Potassium‐ion storage is being explored by researchers for its advantages in forming graphite‐based intercalation compounds, with cost‐effective production compared to lithium‐ion systems. However, its poor performance in graphite‐based platforms, owing to the volume expansion required for intercalation, has demanded alternative materials for reversible potassiation. Herein, we demonstrate a simple one‐step pyrolysis approach to develop an amorphous hard carbon material from commercial cellulose for high‐performance potassium‐ion batteries (KIB). The larger interlayer spacing (∼0.4 nm) alongside the electronegative oxygen functional groups promotes potassium‐ion storage. High capacity, good rate and long cycling performance with lower‐volume expansion could be credited to the amorphous carbon that possesses turbostratic nanodomains. Further, oxygen functional groups on the carbon material are identified in our experimental studies, and density functional theory simulations indicate that these are likely to enhance the potassium‐ion capacity of the materials.

中文翻译：

纤维素衍生硬碳中钾离子的储存：官能团的作用

研究人员正在探索钾离子存储在形成石墨基插层化合物方面的优势，与锂离子系统相比具有成本效益的生产方式。但是，由于插层所需的体积扩大，其在石墨基平台上的性能较差，因此需要用于可逆钾化的替代材料。本文中，我们演示了一种简单的一步热解方法，可以从商用纤维素开发出用于高性能钾离子电池（KIB）的非晶态硬碳材料。更大的中间层间距（约0.4 nm）与负电性氧官能团一起促进了钾离子的存储。高容量，高速率和长循环性能以及较低的体积膨胀可以归因于具有涡轮层状纳米域的无定形碳。进一步，

更新日期：2020-06-21

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