Evolution of the porous structure for phosphoric acid etching carbon as cathodes in Li–O2 batteries: Pyrolysis temperature-induced characteristics changes,Carbon Energy

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Evolution of the porous structure for phosphoric acid etching carbon as cathodes in Li–O2 batteries: Pyrolysis temperature-induced characteristics changes
Carbon Energy ( IF 19.5 ) Pub Date : 2023-07-27 , DOI: 10.1002/cey2.372
Feiyang Yang ₁ , Ying Yao _{1,

2} , Yunkai Xu ₃ , Cong Wang ₁ , Meiling Wang ₁ , Jingjie Ren ₁ , Cunzhong Zhang ₁ , Feng Wu _{1,

2} , Jun Lu ₃

Affiliation

Although biomass-derived carbon (biochar) has been widely used in the energy field, the relation between the carbonization condition and the physical/chemical property of the product remains elusive. Here, we revealed the carbonization condition's effect on the morphology, surface property, and electrochemical performance of the obtained carbon. An open slit pore structure with shower-puff-like nanoparticles can be obtained by finely tuning the carbonization temperature, and its unique pore structure and surface properties enable the Li–O₂ battery with cycling longevity (221 cycles with 99.8% Coulombic efficiency at 0.2 mA cm⁻² and controlled discharge–charge depths of 500 mAh g⁻¹) and high capacity (16,334 mAh g⁻¹ at 0.02 mA cm⁻²). This work provides a greater understanding of the mechanism of the biochar carbonization procedure under various pyrolysis conditions, paving the way for future study of energy storage devices.

中文翻译：

Li-O2电池中磷酸蚀刻碳作为阴极的多孔结构的演变：热解温度引起的特性变化

尽管生物质衍生碳（生物炭）已广泛应用于能源领域，但碳化条件与产品物理/化学性质之间的关系仍然难以捉摸。在这里，我们揭示了碳化条件对所得碳的形貌、表面性质和电化学性能的影响。通过微调碳化温度可以获得具有喷淋状纳米颗粒的开缝孔结构，其独特的孔结构和表面性质使Li-O ₂电池具有循环寿命（221次循环，0.2时库仑效率为99.8%） mA cm ^{-2和 500 mAh g}^-1的受控放电-充电深度）和高容量（0.02 mA cm ^{-2时为 16,334 mAh g}^-1）。这项工作使人们对各种热解条件下生物炭碳化过程的机制有了更深入的了解，为未来储能装置的研究铺平了道路。

更新日期：2023-07-27

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