Uniform Lithium Nucleation Guided by Atomically Dispersed Lithiophilic CoNx Sites for Safe Lithium Metal Batteries

He Liu, Xiang Chen, Xin Bing Cheng, Bo Quan Li, Rui Zhang, Bin Wang, Xiao Chen, Qiang Zhang*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

99 引用 (Scopus)

摘要

The mossy lithium dendrite growth during repeated lithium plating/stripping induces low Coulombic efficiency, poor lifespan, and safety concerns of working lithium metal batteries. Herein, atomically dispersed CoNx-doped graphene is exploited as a host to accommodate dendrite-free lithium deposits. The coordination between Co and N in the conductive matrix can effectively regulate the local electronic structure, and thereby enhance the adsorption of lithium ions and promote the following nucleation process. Meanwhile, the doped N facilitates high dispersion of Co atoms into graphene through the CoN coordination bond. The strong lithiophilicity provided by N coordinated with Co promises a uniform lithium nucleation behavior, further contributing to the smooth lithium deposition morphology. These characteristics afford a superhigh Coulombic efficiency of 99.2% at 2.0 mA cm−2 (≈400 cycles) and 5.0 mA cm−2 (350 cycles), and 98.2% at 10.0 mA cm−2 (200 cycles) with a capacity of 2.0 mAh cm−2. LiFePO4|CoNC–Li full cells deliver a long lifespan of 340 cycles at 1.0 C (240 cycles for routine cells). This offers fresh insights into effectively regulating the lithiophilic chemistry of lithium metal host toward uniform nucleation and growth of lithium deposits in working high-energy-density batteries.

源语言英语
文章编号1800354
期刊Small Methods
3
9
DOI
出版状态已出版 - 1 9月 2019
已对外发布

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