Regulating Pore Structure of Hierarchical Porous Waste Cork‐Derived Hard Carbon Anode for Enhanced Na Storage Performance,Advanced Energy Materials

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Regulating Pore Structure of Hierarchical Porous Waste Cork‐Derived Hard Carbon Anode for Enhanced Na Storage Performance
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-11-13 , DOI: 10.1002/aenm.201902852
Yuqi Li _{1,

2} , Yaxiang Lu _{1,

2} , Qingshi Meng _{1,

2} , Anders C. S. Jensen ₃ , Qiangqiang Zhang _{1,

2} , Qinghua Zhang ₄ , Yuxin Tong ₄ , Yuruo Qi _{1,

2} , Lin Gu ₄ , Maria‐Magdalena Titirici ₅ , Yong‐Sheng Hu _{1,

2}

Affiliation

Porous structure design is generally considered to be a reliable strategy to boost ion transport and provide active sites for disordered carbon anodes of Na‐ion batteries (NIBs). Herein, a type of waste cork‐derived hard carbon material (CC) is reported for efficient Na storage via tuning the pore species. Benefiting from the natural holey texture of this renewable precursor, CCs deliver a novel hierarchical porous structure. The effective skeletal density test combined with small angle X‐ray scattering analysis (SAXS) is used to obtain the closed pore information. Based on a detailed correlation analysis between pore information and the electrochemical performance of CCs, improving pyrolysis temperature to reduce open pores (related to initial capacity loss) and increase closed pores (related to plateau capacity) endows an optimal CC with a high specific capacity of ≈360 mAh g⁻¹ in half‐cells and a high energy density of 230 Wh kg⁻¹ in full‐cells with a capacity retention of 71% after 2000 cycles at 2C rate. The bioinspired high temperature pore‐closing strategy and the new insights about the pore structure–performance relationship provide a rational guide for designing porous carbon anode of NIBs with tailored pore species and high Na storage capacity.

中文翻译：

调节分层多孔废木塞衍生的硬碳阳极的孔结构，以提高Na的存储性能

多孔结构设计通常被认为是增加离子传输并为Na-离子电池（NIB）的无序碳阳极提供活性位点的可靠策略。在此，据报道，一种通过软木废料制成的硬碳材料（CC）可通过调节孔的种类来有效地存储Na。得益于这种可再生前体的天然多孔结构，CC可以提供新颖的分层多孔结构。有效的骨骼密度测试结合小角度X射线散射分析（SAXS）用于获得封闭的孔隙信息。基于孔信息与CCs电化学性能之间的详细相关性分析，^-1在半电池和230瓦公斤的高能量密度^-1在全细胞在2C速率2000次循环后71％的容量保持率。受生物启发的高温闭孔策略以及有关孔结构与性能关系的新见解，为设计具有定制孔类型和高Na储存能力的NIB的多孔碳阳极提供了合理的指导。

更新日期：2019-12-27

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