Embedded Growth of Li2O2 Achieved by a Rational Designed Three‐Dimensional Fe2O3@CNS‐CNTs Sandwich Structure for Improving the Performance of Li–O2 Batteries,Energy Technology

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Embedded Growth of Li2O2 Achieved by a Rational Designed Three‐Dimensional Fe2O3@CNS‐CNTs Sandwich Structure for Improving the Performance of Li–O2 Batteries
Energy Technology ( IF 3.6 ) Pub Date : 2020-12-19 , DOI: 10.1002/ente.202000944
Ziqing Qin ₁ , Shiyu Ma ₁ , Youcai Lu ₁ , Hongchang Yao ₁ , Yingying jiao ₁ , Qingchao Liu ₁ , Zhongjun Li ₁

Affiliation

Realizing confined Li₂O₂ growth and enhanced decomposition kinetics is still a challenge for lithium–oxygen (Li–O₂) batteries, which influences its electrochemical performances. Herein, a three‐dimensional (3D) porous sandwich cathode architecture constructed through the self‐assembly of the in situ growing Fe₂O₃ nanorods on graphitic carbon nitride nanosheets (CNS) together with carbon nanotubes (CNTs) (Fe₂O₃@CNS‐CNTs) is presented. The formation of Fe–N structure can offer the active sites for the oxygen reduction reaction (ORR) and Fe₂O₃ nanorods provide the nucleation sites for the growth of Li₂O₂. Due to the 3D sandwich structure, the Li₂O₂ nanosheets can be deposited in the inner space of the 3D structure with an embedded mode, which confines the size and distribution of Li₂O₂. This work offers more possibilities for the realization of the controllable Li₂O₂ deposition, holding great promise in enlightening the hybrid cathode design for Li–O₂ batteries.

中文翻译：

合理设计的三维Fe2O3 @ CNS-CNTs夹心结构实现了Li2O2的嵌入生长，从而改善了Li-O2电池的性能

对于锂氧（Li–O ₂）电池而言，实现局限的Li ₂ O ₂生长和增强的分解动力学仍然是一个挑战，这会影响其电化学性能。本文中，通过在石墨氮化碳纳米片（CNS）上原位生长的Fe ₂ O ₃纳米棒与碳纳米管（CNT）（Fe ₂ O ₃ @ ）的自组装构建了三维（3D）多孔夹心阴极结构CNS‐CNTs）。Fe–N结构的形成可为氧还原反应（ORR）提供活性位，Fe ₂ O ₃纳米棒为Li的生长提供成核位₂ O ₂。由于3D三明治结构，Li ₂ O ₂纳米片可以以嵌入模式沉积在3D结构的内部空间中，这限制了Li ₂ O ₂的尺寸和分布。这项工作为实现可控的Li ₂ O ₂沉积提供了更多的可能性，在启发Li-O ₂电池的混合阴极设计方面具有广阔的前景。

更新日期：2021-02-05

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