合金反应诱导的半共格界面调控钠金属成核和生长实现少量负极钠金属电池的长期循环
Tailoring alloy-reaction-induced semi-coherent interface to guide sodium nucleation and growth for long-term anode-less sodium-metal batteries
马培 1张耀扬 1李文斌 1罗钧 1文龙飞 1唐国串 1盖晶晶 1王庆保 1赵铃飞 2盖军民 1陈卫华3
作者信息
- 1. College of Chemistry,Zhengzhou University,Zhengzhou 450001,China
- 2. Institute for Superconducting & Electronic Materials,University of Wollongong,Innovation Campus,Squires Way,North Wollongong,NSW 2500,Australia
- 3. College of Chemistry,Zhengzhou University,Zhengzhou 450001,China;State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Zhengzhou University,Zhengzhou 450002,China
- 折叠
摘要
钠金属电池因其能量密度高、资源丰富等优势被认为是一种极具前景的电化学储能技术,然而在高面容量下实现电池持续运行是阻碍该系统应用的关键科学问题.本文通过工业电镀策略在商业化的铝箔集流体表面精心设计了二维锡/钠锡合金涂层.与目前广泛报道的Sn与Na原位形成Na15Sn4合金不同,设计的Na9Sn4合金界面与钠具有更低的晶格失配率(20.84％),进而形成半共格界面,从而减缓钠金属沉积过程中的晶格应力,并诱导钠在高面容量下致密沉积.此外,Sn与阴离子的吸附作用使得更多的PF6-优先参与界面溶剂化结构,从而促进形成薄(10 nm)的富含NaF等无机物的固态电解质界面,增强钠离子的传输,进一步有助于钠金属的均匀沉积,提高钠金属沉积/剥离循环的可逆性和稳定性.因此,衬底在5 mA h cm-2的高面容量下,表现出高达99.7％的平均库仑效率.在60 mA g-1下,全电池展现出600周的循环稳定性,每圈循环衰减率低至0.0018％.
Abstract
Sodium metal batteries are emerging as pro-mising energy storage technologies owing to their high-energy density and rich resources.However,the challenge of achiev-ing continuous operation at high areal capacity hinders the application of this system.Here,a robust two-dimensional tin/sodium-tin alloy interface was introduced onto an Al substrate as an anode via an industrial electroplating strategy.Unlike the widely accepted in situ formation of Na15Sn4 alloys,the formation of Na9Sn4 alloys results in a semi-coherent interface with sodium due to low lattice mismatch(20.84％),which al-leviates the lattice stress of sodium deposition and induces subsequent dense sodium deposition under high areal capa-city.In addition,the strong interaction of Sn with anions al-lows more PF6-to preferentially participate in the interfacial solvation structure,thereby facilitating the formation of a thin(10 nm)NaF-rich solid electrolyte interface.Therefore,the substrate can withstand a high areal capacity of 5 mA h cm-2,exhibiting a high average Coulombic efficiency of 99.7％.The full battery exhibits long-term cycling performance(600 cy-cles)with a low decay rate of 0.0018％per cycle at 60 mA g-1.
关键词
sodium-metal batteries/semi-coherent interface/so-lid-electrolyte interface/areal capacity/cycle lifeKey words
sodium-metal batteries/semi-coherent interface/so-lid-electrolyte interface/areal capacity/cycle life引用本文复制引用
出版年
2024
NETL
NSTL
万方数据