Fast-charging high-energy lithium-ion batteries via implantation of amorphous silicon nanolayer in edge-plane activated graphite anodes

Namhyung Kim,Jaephil Cho,Minseong Ko,Sujong Chae,Jiyoung Ma

doi:10.1038/s41467-017-00973-y

Abstract

As fast-charging lithium-ion batteries turn into increasingly important components in forthcoming applications, various strategies have been devoted to the development of high-rate anodes. However, despite vigorous efforts, the low initial Coulombic efficiency and poor volumetric energy density with insufficient electrode conditions remain critical challenges that have to be addressed. Herein, we demonstrate a hybrid anode via incorporation of a uniformly implanted amorphous silicon nanolayer and edge-site-activated graphite. This architecture succeeds in improving lithium ion transport and minimizing initial capacity losses even with increase in energy density. As a result, the hybrid anode exhibits an exceptional initial Coulombic efficiency (93.8%) and predominant fast-charging behavior with industrial electrode conditions. As a result, a full-cell demonstrates a higher energy density (≥1060 Wh l−1) without any trace of lithium plating at a harsh charging current density (10.2 mA cm−2) and 1.5 times faster charging than that of conventional graphite.

Highlights

As fast-charging lithium-ion batteries turn into increasingly important components in forthcoming applications, various strategies have been devoted to the development of high-rate anodes
Conventional graphite anodes have been limited in terms of fast charging by the metallic lithium plating phenomenon caused by its sluggish intercalation kinetics[1,2,3] and low lithiation voltage (0.08 V vs. Li/Li+)[4]
We propose a novel Si–Graphite composite design, which possesses the enhanced kinetics for Li+ and satisfies the aforementioned industrial electrode conditions

Summary

Introduction

As fast-charging lithium-ion batteries turn into increasingly important components in forthcoming applications, various strategies have been devoted to the development of high-rate anodes. C Galvanostatic charge capacities of SEAG under various lithiation current densities from 0.35 to 10.5 mA cm−2, compared to SEAG with Ni silicide and graphite.

Results

Conclusion