THESIS
2018
xxii, 135, that is, xxiv, 139 pages : illustrations ; 30 cm
Abstract
The development of lithium metal batteries (LMBs) is hampered by their safety
issues mainly caused by dendrite formation. A simple, effective and economical way
for the suppression of detrimental effect of lithium (Li) dendrite growth is highly
desirable. In this thesis, facile strategies to improve the performance of LMBs by
structuring electrolyte are presented.
Ionic liquid (IL) was firstly grafted to mesoporous silica nanoparticles (MSNs) to
form IL-tethered nanoparticles (MSN-IL-TFSI). The effects of the contents of MSN-IL-IL-TFSI on electrochemical properties of the hybrid electrolytes were studied
systematically. The advantageous effect exerted by the hybrid electrolytes on Li
electrodeposition was confirmed by galvanostatic polarization. To further improve
lithium ion t...[
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The development of lithium metal batteries (LMBs) is hampered by their safety
issues mainly caused by dendrite formation. A simple, effective and economical way
for the suppression of detrimental effect of lithium (Li) dendrite growth is highly
desirable. In this thesis, facile strategies to improve the performance of LMBs by
structuring electrolyte are presented.
Ionic liquid (IL) was firstly grafted to mesoporous silica nanoparticles (MSNs) to
form IL-tethered nanoparticles (MSN-IL-TFSI). The effects of the contents of MSN-IL-IL-TFSI on electrochemical properties of the hybrid electrolytes were studied
systematically. The advantageous effect exerted by the hybrid electrolytes on Li
electrodeposition was confirmed by galvanostatic polarization. To further improve
lithium ion transference number, IL-decorateed PMMA nanoparticles (PMMA-IL-TFSI)
were used to immobilize anions to prepare single-ion conducting polymer
electrolytes (SIPEs). The effective suppression of lithium dendrite growth using this
SIPE further confirmed that lithium ion transference number is one of the determined
factors for the alleviation of lithium dendrite nucleation. Furthermore, IL was applied
as additive/plasticizer to fabricate solid polymer electrolytes (SPEs). Owing to the
significant contribution of ILs, the obtained SPEs exhibited excellent mechanical
properties without sacrificing ionic conductivity, as well as promising potential for the
use in wearable/flexible lithium batteries. In addition, the as-synthesized PMMA-IL-TFSI
nanoparticles were blended with a mixture of propylene carbonate (PC)/ methyl
acetate (MA) to develop a new electrolyte system. Electrochemical properties and
mechanism for the enhancement of low-temperature performances at low temperature
were investigated in detail. Finally, Li-ion conductive LLZO nanofibers were incorporated with PVDF-HFP matrix to design a new type of solid polymer electrolyte.
Owing to the continuous pathways provided by LLZO nanofibers, the developed SPE
exhibited very high room-temperature ionic conductivity, making it a good example
for the development of solid polymer electrolytes combined inorganic Li-ion
conductive ceramics with polymer matrices.
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