High-Performance Li-CO2 Batteries from Free-Standing, Binder-Free, Bifunctional Three-Dimensional Carbon Catalysts,ACS Energy Letters

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High-Performance Li-CO2 Batteries from Free-Standing, Binder-Free, Bifunctional Three-Dimensional Carbon Catalysts
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-02-28 , DOI: 10.1021/acsenergylett.0c00181
Ying Xiao _{1,

2} , Feng Du ₁ , Chuangang Hu _{1,

3} , Yong Ding ₄ , Zhong Lin Wang ₄ , Ajit Roy ₅ , Liming Dai _{1,

3}

Affiliation

A free-standing, binder-free, N-doped double-layered three-dimensional (3D) CNT/G cathode consisting of a structure with vertically aligned N-doped CNTs sandwiched between two N-doped graphene layers of a seamless junction at the CNT/G interfaces (3D NCNT/G) was developed for Li-CO₂ batteries. It was found that the N-doped 3D CNT/G architecture could not only facilitate CO₂ gas and electrolyte diffusion through the vertically aligned open channels and electron transport via the 3D carbon network but also provide a large surface area to support numerous triphase active sites for efficient charge and discharge. As a result, the resultant Li-CO₂ batteries showed a large specific capacity of 17534.1 mAh g^–1 with high Coulombic efficiency of 98.3% and low overpotential (1.13 V) and good cycling stability (up to 180 discharge–charge cycles with a cutoff capacity of 1000 mAh g^–1 at 100 mA g^–1). This work represents a new approach to efficient energy storage with affordable, metal-free, binder-free, and porous carbon-based catalytic electrodes.

中文翻译：

自由，无粘合剂，双功能三维碳催化剂的高性能Li-CO ₂电池

一个独立的，无粘合剂的，N掺杂的双层三维（3D）CNT / G阴极，该阴极由以下结构组成：垂直排列的N掺杂CNT夹在两个无缝连接处的N掺杂的石墨烯层之间。 CNT / G接口（3D NCNT / G）是为Li-CO ₂电池开发的。发现N掺杂的3D CNT / G结构不仅可以促进CO ₂气体和电解质通过垂直排列的明渠扩散以及通过3D碳网络的电子传输，而且可以提供较大的表面积来支持众多的三相活性位用于高效充电和放电。结果，所得的Li-CO ₂电池显示出17534.1 mAh g ^–1的大比容量具有98.3％的高库仑效率和低电势（1.13 V）和良好的循环稳定性（在100 mA g ^–1时，截止容量为1000 mAh g ^{–1的情况下}，最多可进行180个放电-充电循环）。这项工作代表了一种新的有效储能方法，其价格低廉，不含金属，不含粘合剂和多孔碳基催化电极。

更新日期：2020-03-02

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