التفاصيل البيبلوغرافية
| العنوان: |
Enabling Lithium Metal Anode for Garnet Electrolyte based Solid State Batteries |
| المؤلفون: |
Raj, Vikalp |
| المساهمون: |
Aetukuri, Naga Phani B |
| سنة النشر: |
2022 |
| المجموعة: |
Indian Instiute of Science, Bangalore: etd@IIsc (Electronic Theses and Disserations) |
| مصطلحات موضوعية: |
Batteries, Dendrites, Electrochemistry, Lithium, Research Subject Categories::NATURAL SCIENCES::Chemistry::Other chemistry |
| الوصف: |
Solid-state lithium metal batteries (SSLMB) employing inorganic solid electrolytes (ISE) in conjunction with lithium metal anode and intercalation cathode are considered among the most promising alternatives for Li-ion batteries1. Li-metal is an optimal choice of anode because of its high gravimetric and volumetric energy density. ISE, along with being flame-retardant, has a superior tolerance for a wide operating temperature range (−30 to 100 °C) while delivering a reliable performance2. The high shear modulus of ISE is also expected to mechanically suppress lithium dendrite growth3, thus enabling high energy density batteries. However, lithium dendrite penetration at current densities as low as 50 µA/cm2 was observed in SSLMBs4, while current densities of ≥1mA/cm2 are desired for practical use. The microscopic mechanisms that lead to lithium dendrite growth in SSLMBs are still unclear. Furthermore, the poor electrode/electrolyte interface coupled with processing challenges of ISEs have thwarted their realization as a practical battery system5. In the present work, we investigate dendrite growth through ISE, one of the most fundamental challenges with SSLMBs. First, for the choice of ISE, we synthesized Li6.4La3Zr1.4Ta0.4O12 (LLZTO), a garnet-type fast Li-ion conducting oxide. We interface lithium metal to this ISE via a well-known approach of employing a lithium alloying interlayer in between lithium metal and ISE. However, cells fabricated using aluminium interlayer show signs of dendrite growth at a current density of <300 µA/cm2. Through a set of electrochemical and scanning electron microscopy (SEM) techniques, we observed that interfacial voids at Li/LLZTO interface precede dendrite nucleation and growth. We believe that the edges of these voids can act as a favourable nucleation site for dendrites. Using a simple electrostatic model, we show that current density at the edges of the voids could be amplified by as much as four orders of magnitude, making the cells highly susceptible to dendrite growth ... |
| نوع الوثيقة: |
thesis |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| Relation: |
https://etd.iisc.ac.in/handle/2005/5920 |
| الاتاحة: |
https://etd.iisc.ac.in/handle/2005/5920 |
| Rights: |
I grant Indian Institute of Science the right to archive and to make available my thesis or dissertation in whole or in part in all forms of media, now hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation |
| رقم الانضمام: |
edsbas.A6CD658B |
| قاعدة البيانات: |
BASE |