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Study on electrodeposition of lithium metal for next generation lithium-ion anodes
KTH, School of Chemical Science and Engineering (CHE).
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The lithium-ion battery technology is commercialized since more than 20 years and is approaching its the­ oretical limits. Hence, new technologies are needed to prevent  a stagnation of the maximal energy density of batteries [l]. To answer this need, the use of lithium metal has been investigated since the 1970s [2]. In addition of having one of the lowest negative electrochemical potential (-3.040Vs1m [3]), it also has a very high theoretical specific capacity (3860 mAh.g·1 )  due to its low density (0.534 g.cm·3 )  [l]. Thus, extensive research are conducted on lithium-air as well as lithium-sulfur battery to achieve longer autonomy for electrical vehicles that are in high demand in the current market [4] [5] [6] [7]. All these factors make the research on metallic lithium anode a demanding topic nowadays [8].

 

The current knowledge on lithium metal electrochemical behavior creates several issues concerning its utiliza­tion in batteries.  It is known to quickly loose coulombic efficiency while cycling due to side reactions, creating a poorly-conductive passivation layer, as well as preferably forming dendrites during the plating process, leading to short circuits in a small number of cycles [l] (5] [6]. These issues prevent the use of lithium metal anodes in classical batteries without firstly gathering information on the lithium plating process.

 

Numerous parameters are known to influence the lithium deposition, the most important ones being the elec­trolyte composition, the substrate and the physical parameters. The latter are the least studied parameters and research need to be undertaken to understand fully their influences on the deposition.

 

In this report the current lithium-ions batteri es technology will be briefly int roduced. It is followed by a pre­sentation of the different parameters influencing the deposition of lithium. The current density influence on the deposit morphology will then be investigated. Finally, the result will be analyzed to determine how to achieve a uniform lithium electrodeposition.

Place, publisher, year, edition, pages
2017.
Keywords [en]
Current controlled electroplating, lithium metal anode, next generation lithium-ion battery
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-210239OAI: oai:DiVA.org:kth-210239DiVA, id: diva2:1117705
External cooperation
The Holst Center
Available from: 2017-06-29 Created: 2017-06-29 Last updated: 2017-06-29Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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