阳极
金属锂
骨架(计算机编程)
锂(药物)
材料科学
化学工程
电极
金属
无机化学
化学
计算机科学
冶金
生物
工程类
内分泌学
物理化学
程序设计语言
作者
Guang Yang,Shuai Yang,Ting Zhang,Guo Ai,Meng Sun,Bo Zhang,Kun Dai,Feng Pei,Wenfeng Mao,Dejun Li
标识
DOI:10.1016/j.jallcom.2021.162802
摘要
Lithium metal has been considered as one of the most promising anodes for the endeavoring pursuit of advanced batteries due to its ultra-high capacity of ~3860 mAh g−1. To solve the current problems of lithium metal anode (LMA), such as unrollable dendritic growth, dead Li accumulation, and the resulted pulverization, three-dimensional frameworks have been adopted to maintain the structural integrity of LMA, but the issues including interfacial stability and affinity, undesired Li-ion deletion at the electrolyte/electrode interface are still challenging. Herein, by adopting hierarchical porous graphitic carbon (HPGC) as LMA skeleton and the atomic-level MgO for interface modification, the ideally uniform interface with strong Li affinity can effectively regulate the nucleation and deposition behavior of Li metal; while with the large quantity of Li+ storage in the micro-porous of HPGC, both the spatial confinement of Li+ flux and the increase in Li+ concentration at electrode/electrolyte interface can be achieved to facilitate the planer Li metal electrodeposition. Furthermore, the delithiation of HPGC with slightly higher potential can effectively reduce the formation of dead-Li via preventing the depletion of Li with inexhaustible Li+ storage during stripping process. The superiority of [email protected] hosted LMA can be demonstrated both as coating layer and interior skeleton for different kinds of LMA applications, with enhancement in both long term cycling stability (~650 h) and high coulombic efficiency (~97%) over 390 cycles.
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