调控锂含量来提高Li-B合金的储锂性能

Boosting lithium storage of Li-B alloys through regulating lithium content

曾婧 ¹陈勇 ¹刘秀芳 ²王日初 ²彭翔²

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作者信息

1. School of Metallurgy and Environment,Central South University,Changsha 410083,China
2. School of Materials Science and Engineering,Central South University,Changsha 410083,China
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摘要

Li-B合金具有较高的能量密度和结构稳定性,有望满足日益增长的储能需求.其纤维状多孔骨架可以增加电化学活性面积,降低局部电流密度,从而减少锂枝晶.在本文中,制备了不同锂含量的Li-B合金,研究了锂含量对Li-B合金的结构和电化学性能影响.结果表明,随着锂含量的增加,Li-B合金骨架间距增大,骨架顶部的沉积减少,导致SEI变薄,极化降低.在对称电池中,锂含量最高的Li-B合金(锂含量为64 wt.％)循环时间最长,在1 mA/cm2和0.5 mA·h/cm2下的循环时间超过140h,过电位最小(0.08 V).当与LiNi0.5Co0.2Mn0.3O2配对时,全电池具有最高的放电比容量和最佳倍率性能.

Abstract

Li-B alloy is expected to meet the expanding demands of energy storage,primarily driven by their high energy density and structural stability.The fibrous porous skeleton can increase the electrochemical active area and reduce the local current density,therefore diminishing the lithium dendrites.In this study,we prepared Li-B alloys with different lithium contents and examined the impact of lithium content on the structure and electrochemical properties of Li-B alloys.With the increase of lithium content,the spacing between the skeleton of the Li-B alloys increases.The lithium deposition on the top of the skeleton decreases,leading to thinner SEI,and lower polarization.The Li-B alloy with the highest lithium content(64 wt.％lithium content)in the symmetric battery exhibits the longest cycle time,lasting over 140 h at 1 mA/cm2 and 0.5 mA·h/cm2,with a minimal overpotential of 0.08 V.When paired with LiNi0.5Co02Mn03O2,the full battery has the highest specific discharge capacity and the best rate capacity.

关键词

Li-B合金/锂枝晶/三维骨架/锂金属电池

Key words

Li-B alloys/lithium dendrite/three-dimensional skeleton/lithium metal battery

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出版年

2024

中南大学学报(英文版)

中南大学

中南大学学报(英文版)

CSTPCDEI

影响因子：0.47

ISSN：2095-2899

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