In Situ X-ray Diffraction Studies of (De)lithiation Mechanism in Silicon Nanowire Anodes

被引：172

作者：

Misra, Sumohan ^{[3
]}

Liu, Nian ^{[4
]}

Nelson, Johanna ^{[2
,3
]}

Hong, Seung Sae ^{[5
]}

Cui, Yi ^{[1
,2
]}

Toney, Michael F. ^{[2
,3
]}

机构：

[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[2] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[3] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA

[4] Stanford Univ, Dept Chem, Stanford, CA 94305 USA

[5] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

来源：

ACS NANO | 2012年 / 6卷 / 06期

关键词：

Li-ion batteries; silicon nanowires; in situ X-ray diffraction; (de)lithiation mechanism; phase evolution; electrochemical performance; LITHIUM-ION BATTERY; HIGH-PERFORMANCE; HIGH-CAPACITY; LI; CRYSTALLINE; PHASE; MICROSCOPY; ELECTRODES; PARTICLES; COMPOUND;

D O I：

10.1021/nn301339g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Silicon is a promising anode material for Li-ion batteries due to its high theoretical specific capacity. From previous work, silicon nanowires (SiNWs) are known to undergo amorphorization during lithiation, and no crystalline Li-Si product has been observed. In this work, we use an X-ray transparent battery cell to perform in situ synchrotron X-ray diffraction on SiNWs in real time during electrochemical cycling. At deep lithiation voltages the known metastable Li15Si4 phase forms, and we show that avoiding the formation of this phase, by modifying the SiNW growth temperature, improves the cycling performance of SiNW anodes. Our results provide insight on the (de)lithiation mechanism and a correlation between phase evolution and electrochemical performance for SiNW anodes.

引用

页码：5465 / 5473

页数：9

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