A Porous Network of Bismuth Used as the Anode Material for High-Energy-Density Potassium-Ion Batteries

被引：471

作者：

Lei, Kaixiang ^{[1
,2
]}

Wang, Chenchen ^{[1
,2
]}

Liu, Luojia ^{[1
,2
]}

Luo, Yuwen ^{[1
,2
]}

Mu, Chaonan ^{[1
,2
]}

Li, Fujun ^{[1
,2
]}

Chen, Jun ^{[1
,2
]}

机构：

[1] Nankai Univ, Coll Chem, Minist Educ, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China

[2] Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300071, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2018年 / 57卷 / 17期

基金：

中国国家自然科学基金;

关键词：

bismuth; cycle stability; dimethoxyethane-based electrolyte; energy density; potassium-ion batteries; STORAGE PERFORMANCE; ELECTRODES; GRAPHITE; PHASE;

D O I：

10.1002/anie.201801389

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Potassium-ion batteries (KIBs) are plagued by a lack of materials for reversible accommodation of the large-sized K+ ion. Herein we present, the Bi anode in combination with the dimethoxyethane-(DME) based electrolyte to deliver a remarkable capacity of ca. 400 mAhg(-1) and long cycle stability with three distinct two-phase reactions of Bi <-> KBi2 <-> K3Bi2 <-> K3Bi. These are ascribed to the gradually developed three-dimensional (3D) porous networks of Bi, which realizes fast kinetics and tolerance of its volume change during potassiation and depotassiation. The porosity is linked to the unprecedented movement of the surface Bi atoms interacting with DME molecules, as suggested by DFT calculations. A full KIB of Bi//DME-based electrolyte//Prussian blue of K0.72Fe[Fe(CN)(6)] is demonstrated to present large energy density of 108.1 Wh kg(-1) with average discharge voltage of 2.8 V and capacity retention of 86.5% after 350 cycles.

引用

页码：4687 / 4691

页数：5

共 29 条

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