Effects of particle size of boron on the structure and electrochemical performance of lithium-boron alloys

被引：0
|
作者：
Liu X. [1 ]
Wang R. [1 ]
Peng C. [1 ]
Zeng J. [2 ]
机构：
[1] School of Materials Science and Engineering, Central South University, Changsha
[2] School of Metallurgy and Environment, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 10期
基金：
中国国家自然科学基金;
关键词：
3D skeleton; anode; Li-B alloy; lithium metal batteries;
D O I：
10.11817/j.issn.1672-7207.2023.10.009
中图分类号：
学科分类号：
摘要：
Lithium metal has high specific capacity, low density and low electrochemical potential, and a candidate material for the anode of lithium secondary batteries, but the uncontrollable growth of lithium dendrites and the drastic volume change of lithium during cycling lead to huge security risks. The three-dimensional porous fibrous framework of Li-B alloy can reduce the local current density, alleviate the growth of lithium dendrites and reduce the volume change. In this paper, amorphous boron powders with different particle sizes were used to prepare Li-B alloy anodes, and the effect of boron powder particle size on the structure and electrochemical properties of Li-B alloys was studied. The results show that the skeleton pore size of lithium boron alloy prepared from boron powder with average particle diameter of 1.49 μm is the smallest, and lithium will be blocked during deposition/dissolution. The lithium boron alloy prepared by boron powder with average particle diameter of 3.12 μm has a reasonable size and uniform distribution of skeleton pores, which is conducive to the deposition and dissolution of lithium. In the symmetric battery, it exhibits the lowest overpotential(0.13 V) and the lowest interfacial resistance. In the full battery with LiNi0.5Co0.2Mn0.3O2 as the cathode, it has the highest specific capacity. © 2023 Central South University of Technology. All rights reserved.
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页码：3875 / 3885
页数：10
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