Regulating microstructure in agar-derived N-doped hard carbon towards enhanced sodium ion storage

IF 8.9 2区 工程技术 Q1 ENERGY & FUELS
Yuhan Ji , Tong Wang , Xu Yao , Jingkui Gao , Yanting Chu , Jingwen Sun , Haitao Dong , Jingquan Sha
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Abstract

Hard carbon (HC) with larger interlayer spacing, lower operation potential and stable skeleton is a promising kind of anode materials for sodium-ion batteries (SIBs), where heteroatom doping and structural design have been proved to be effective strategies to improve its Na+ storage performance. Herein, biomass agar-derived N-doped porous carbon (NPC-Ts, T = 750, 900 and 1050 °C) were successfully fabricated by modulating carbonization temperature, where interlayer spacing, specifical surface area (SSA), micro/mesopore amount and N-doping levels and configurations (pyridinic N (N-6), pyrrolic N (N-5) and graphite N (N-Q)) were explored in detail. Among the NPC-900 shows the largest interlayer spacing (0.412 nm), SSA (3991 m2/g) and sum percentage of N-6 and N-5 (76.7 %). When applied as anode material for SIBs, NPC-900 exhibits the highly reversible capacity (430.9 mAh/g at 100 mA/g after 100 cycles) and excellent rate capability (162 mAh/g at 5000 mA/g) and outstanding cycle life (242.6 mAh/g at 1000 mA/g after 5000 cycles). More importantly, when coupled with Na3V2(PO4)3 (NVP) cathode, the Na+ full cell displays the highest practical energy density of 267 Wh/kg to date, to the best our knowledge, revealing its potential practical sodium storage applications.

Abstract Image

调控琼脂衍生n掺杂硬碳的微观结构以增强钠离子的储存
层间距大、操作电位低、骨架稳定的硬碳是一种很有前途的钠离子电池负极材料,杂原子掺杂和结构设计已被证明是提高其Na+存储性能的有效策略。本文通过调节炭化温度,成功制备了生物质琼脂衍生的N掺杂多孔碳(NPC-Ts, T = 750、900和1050℃),并对层间距、比表面积(SSA)、微孔/中孔数量以及N掺杂水平和构型(吡啶N (N-6)、吡啶N (N-5)和石墨N (N- q))进行了详细研究。其中,NPC-900的层间距最大(0.412 nm), SSA为3991 m2/g, N-6和N-5的总和百分比为76.7%。当用作sib的阳极材料时,pcs -900表现出高度可逆的容量(100 mA/g后,430.9 mAh/g)和出色的倍率容量(5000 mA/g时,162 mAh/g)和出色的循环寿命(5000次循环后,242.6 mAh/g, 1000 mA/g)。更重要的是,当与Na3V2(PO4)3 (NVP)阴极耦合时,Na+充满电池显示出迄今为止最高的实用能量密度267 Wh/kg,据我们所知,揭示了其潜在的实际钠存储应用。
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来源期刊
Journal of energy storage
Journal of energy storage Energy-Renewable Energy, Sustainability and the Environment
CiteScore
11.80
自引率
24.50%
发文量
2262
审稿时长
69 days
期刊介绍: Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.
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