Amine–Aldehyde Condensation-Derived N-Doped Hard Carbon Microspheres for High-Capacity and Robust Sodium Storage,Small

当前位置： X-MOL 学术 › Small › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Amine–Aldehyde Condensation-Derived N-Doped Hard Carbon Microspheres for High-Capacity and Robust Sodium Storage
Small ( IF 13.0 ) Pub Date : 2023-06-28 , DOI: 10.1002/smll.202303790
Ran Chen ₁ , Xinyuan Li ₁ , Congcong Cai ₁ , Hao Fan ₁ , Yujie Deng ₁ , Huogen Yu ₁ , Liqiang Mai _{1,

2} , Liang Zhou _{1,

2}

Affiliation

Hard carbon is generally accepted as the choice of anode material for sodium-ion batteries. However, integrating high capacity, high initial Coulombic efficiency (ICE), and good durability in hard carbon materials remains challenging. Herein, N-doped hard carbon microspheres (NHCMs) with abundant Na⁺ adsorption sites and tunable interlayer distance are constructed based on the amine–aldehyde condensation reaction using m-phenylenediamine and formaldehyde as the precursors. The optimized NHCM-1400 with a considerable N content (4.64%) demonstrates a high ICE (87%), high reversible capacity with ideal durability (399 mAh g⁻¹ at 30 mA g⁻¹ and 98.5% retention over 120 cycles), and decent rate capability (297 mAh g⁻¹ at 2000 mA g⁻¹). In situ characterizations elucidate the adsorption–intercalation-filling sodium storage mechanism of NHCMs. Theoretical calculation reveals that the N-doping decreases the Na⁺ adsorption energy on hard carbon.

中文翻译：

胺-醛缩合衍生的氮掺杂硬碳微球用于高容量和稳健的钠存储

硬碳被普遍认为是钠离子电池负极材料的选择。然而，在硬碳材料中集成高容量、高初始库仑效率（ICE）和良好的耐久性仍然具有挑战性。在此，基于间苯二胺和甲醛作为前驱体的胺醛缩合反应，构建了具有丰富的Na ⁺吸附位点和可调层间距的N掺杂硬碳微球（NHCM）。优化的NHCM-1400具有相当大的N含量（4.64%），表现出高ICE（87%）、高可逆容量和理想的耐用性（30 mA g -1 下为399 mAh g -1 ，120个循环后保留率为^98.5 % ^），和良好的倍率性能（2000 mA g ^{-1时为297 mAh g}^-1）。原位表征阐明了 NHCM 的吸附-嵌入-填充钠存储机制。理论计算表明，N掺杂降低了硬碳上Na ^{+ 的}吸附能。

更新日期：2023-06-28

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南