Rooting Zn into metallic Na bulk for energetic metal anode  

将锌植入体相金属钠用于高比容金属负极

作　　者：Xiao Cheng Yichun Wang Jiangfeng Ni Liang Li 程笑;王以春;倪江锋;李亮(School of Physical Science and Technology,Center for Energy Conversion Materials&Physics(CECMP),Jiangsu Key Laboratory of Thin Films,Soochow University,Suzhou 215006,China;Light Industry Institute of Electrochemical Power Sources,Suzhou 215699,China)

机构地区：[1]School of Physical Science and Technology,Center for Energy Conversion Materials&Physics(CECMP),Jiangsu Key Laboratory of Thin Films,Soochow University,Suzhou 215006,China [2]Light Industry Institute of Electrochemical Power Sources,Suzhou 215699,China

出　　处：《Science China Materials》2022年第7期1789-1796,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(52172219,51872192,52025028,and 51772197);the Natural Science Foundation of Jiangsu Province(BK20180002);the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(19KJA170001);the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions。

摘　　要：Metallic Na with high theoretical capacity and low redox potential is an attractive anode material for highenergy rechargeable metal batteries.The poor wettability of Na on current collectors and the weak interaction between Na atoms lead to uneven plating/stripping of Na and dendrite formation.Here,we report an encouraging strategy to tackle these issues by rooting Zn into metallic Na bulk through a molten infusion process.The introduction of Zn not only tunes molten Na into highly sodiophilic Na(Zn)but also guides the uniform nucleation of Na through a much stronger interaction.As a result,smooth Na plating and stripping with a low energy barrier and homogeneous current distribution are simultaneously accomplished.Stable galvanostatic cycling over 3000 h in symmetric Na(Zn)cells and low voltage hysteresis below 15 mV at a rate of 5 mA cm^(-2) have been recorded.When coupled with a Na_(3)V_(2)(PO_(4))_(2)O_(2)F cathode,the Na(Zn)-Na_(3)V_(2)(PO_(4))_(2)O_(2)F full cell demonstrates an energetic performance,highlighting the strategy of rooting Zn into alkali metal bulk for rechargeable metal batteries.具有高理论容量和低电位的金属钠是一种有吸引力的可充电金属电池负极材料.然而钠与集流体之间的难润湿性以及钠原子之间弱的相互作用会导致不均匀的钠沉积/剥离和枝晶形成.本文报道了一种使用熔融灌注法将锌植入到钠体相中来解决这些问题的策略.锌的引入不仅将熔融钠调节为亲钠的钠(锌),而且还通过更强的相互作用来引导钠的均匀成核,从而同时实现了具有低能垒和均匀电流分布的钠沉积和剥离.在5mA cm^(-2)的电流密度下,钠(锌)对称电池表现出超过3000 h的稳定循环和低于15 mV的过电位.当与Na_(3)V_(2)(PO_(4))_(2)O_(2)F正极配合使用时,Na(Zn)-Na_(3)V_(2)(PO_(4))_(2)O_(2)F全电池表现出优异的性能,突出了将锌植入碱金属体相的金属负极改性策略.

关 键 词：Na metal battery Na anode sodiophilicity electrochemical performance 

分 类 号：TM912[电气工程—电力电子与电力传动] TG146.26[一般工业技术—材料科学与工程]