Improved Battery Performance of Nanocrystalline Si Anodes Utilized by Radio Frequency (RF) Sputtered Multifunctional Amorphous Si Coating Layers

被引：16

作者：

Ahn, In-Kyoung ^{[1
]}

Lee, Young-Joo ^{[1
,2
]}

Na, Sekwon ^{[1
]}

Lee, So-Yeon ^{[1
,3
]}

Nam, Dae-Hyun ^{[1
]}

Lee, Ji-Hoon ^{[4
]}

Joo, Young-Chang ^{[1
,3
]}

机构：

[1] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea

[2] Seoul Natl Univ, Inst Adv Machines & Design, Seoul 151742, South Korea

[3] Seoul Natl Univ, Res Inst Adv Mat, Seoul 151742, South Korea

[4] Korea Inst Mat Sci, Surface Technol Div, Adv Funct Thin Films Dept, Chang Won 51508, Gyeongnam, South Korea

来源：

ACS APPLIED MATERIALS & INTERFACES | 2018年 / 10卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

Si anode; RF sputter; coating amorphous Si; Li-ion battery; SOLID-ELECTROLYTE INTERPHASE; HIGH-CAPACITY; SILICON NANOPARTICLES; LITHIUM STORAGE; LI; FILM; LITHIATION;

D O I：

10.1021/acsami.7b17890

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Despite the high theoretical specific capacity of Si, commercial Li-ion batteries (LIBs) based on Si are still not feasible because of unsatisfactory cycling stability. Herein, amorphous Si (a-Si)-coated nano crystalline Si (nc-Si) formed by versatile radio frequency (RF) sputtering systems is proposed as a promising anode material for LIBs. Compared to uncoated nc-Si (retention of 0.6% and Coulombic efficiency (CE) of 79.7%), the a-Si-coated nc-Si (nc-Si@a-Si) anodes show greatly improved cycling retention (C-50th/C-first) of similar to 50% and a first CE of 86.6%. From the ex situ investigation with electrochemical impedance spectroscopy (EIS) and cracked morphology during cycling, the a-Si layer was found to be highly effective at protecting the surface of the nc-Si from the formation of solid-state electrolyte interphases (SEI) and to dissipate the mechanical stress upon de/lithiation due to the high fracture toughness.

引用

页码：2242 / 2248

页数：7

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