التفاصيل البيبلوغرافية
| العنوان: |
High damage tolerance of electrochemically lithiated silicon |
| المؤلفون: |
Xueju Wang, Feifei Fan, Jiangwei Wang, Haoran Wang, Siyu Tao, Avery Yang, Yang Liu, Huck Beng Chew, Scott X. Mao, Ting Zhu, Shuman Xia |
| المصدر: |
Nature, Nature Communications. 6(1):1-7 |
| سنة النشر: |
2015 |
| الوصف: |
Mechanical degradation and resultant capacity fade in high-capacity electrode materials critically hinder their use in high-performance rechargeable batteries. Despite tremendous efforts devoted to the study of the electro–chemo–mechanical behaviours of high-capacity electrode materials, their fracture properties and mechanisms remain largely unknown. Here we report a nanomechanical study on the damage tolerance of electrochemically lithiated silicon. Our in situ transmission electron microscopy experiments reveal a striking contrast of brittle fracture in pristine silicon versus ductile tensile deformation in fully lithiated silicon. Quantitative fracture toughness measurements by nanoindentation show a rapid brittle-to-ductile transition of fracture as the lithium-to-silicon molar ratio is increased to above 1.5. Molecular dynamics simulations elucidate the mechanistic underpinnings of the brittle-to-ductile transition governed by atomic bonding and lithiation-induced toughening. Our results reveal the high damage tolerance in amorphous lithium-rich silicon alloys and have important implications for the development of durable rechargeable batteries. |
| نوع الوثيقة: |
redif-article |
| اللغة: |
English |
| DOI: |
10.1038/ncomms9417 |
| الإتاحة: |
https://ideas.repec.org/a/nat/natcom/v6y2015i1d10.1038_ncomms9417.html |
| رقم الأكسشن: |
edsrep.a.nat.natcom.v6y2015i1d10.1038.ncomms9417 |
| قاعدة البيانات: |
RePEc |
