Exploration Of The Application Of 3D Printing Technology In Lithium Metal Battery Negative Electrod

Lithium metal has an ultra-high theoretical specific capacity(3860 m Ah g^-1)and a low oxidation-reduction potential（compared to standard hydrogen electrodes）,and is considered to be one of the most promising anodes for next-generation rechargeable lithium metal batteries.However,in repeated electroplating and stripping processes,uneven lithium deposition and lithium nucleation lead to the growth of lithium dendrites.This problem will eventually lead to short circuits and poor electrochemical performance.In order to solve the above problems,people have adopted quite a few strategies to solve the challenges of metal lithium anodes,including modifying the electrolyte to form a stable SEI layer,using solid electrolytes,developing diaphragms with high mechanical properties,and using 3D current collectors.Among the above methods,a three-dimensional current collector with a high specific surface area and a designable structure shows great potential in inducing the uniform deposition of metallic lithium.Since 3D printing technology has the characteristics of layered manufacturing of complex structures,it has great advantages in precise control of the printing structure.It can accurately process materials at multiple scales and give full play to the performance of materials.Therefore,we are designing three-dimensional current collectors.There are great advantages in this regard.Based on the above background,this subject designed a three-dimensional current collector support that can induce uniform lithium deposition through 3D printing to inhibit dendrites in the negative electrode of lithium metal batteries.This article focuses on the suppression of lithium dendrites by the design of 3D printing structures and lithiophilic materials,and it explains its mechanism of action through a combination of simulation and experiment.The research content of this article is as follows:First,we used 3D printing to design a 3DP-r GML three-dimensional current collector for lithium metal anode on the macro and micro scale.On the macro scale,the large-scale printing pores created can guide Li deposition into the channel by adjusting the current density of the surface.At the same time,on the microscopic scale,the 3D printed filaments composed of directionally assembled r GO and MXene nanosheets have a high specific surface area and abundant lithophilic nucleation sites,which can uniformly nucleate and deposit lithium.Due to the reasonable design,Li@3DP-r GML has a cycle stability of about 3000 h.Secondly,in order to explain the excellent electrochemical stability of 3DP-r GML,the COMSOL was used to calculate the influence of the 3D printing structure on the lithium ion concentration and current density,and combined with the experiment.At the same time,molecular simulation software was used to calculate the adsorption energies of MXene and r GO to characterize their affinity.This proves that its structure and lithiophilicity have improved lithium dendrites.