In many papers, electrolytes for thin film batteries are amorphous, what is main reason for this?
LiPON (Lithium Phosporous OxyNitride) is an extensively studied thin film electrolyte for thin film battery fabrication having a good ionic conductivity (1-2 *10-6 s / cm). In my opinion, i think two reasons
1.the advantage with amorphous phase is that ions can move in any direction bcz atoms are not ordered. In case of crystalline materials arrangement of atoms follow a particular orientation , that may restrict the movement of Li ions during intercalation and deintercalation .
2.The fabrication of thin film micro battery involves sequential deposition of cathode, LiPON , and anode. In case if we anneal LIPON film after depositng, then already deposited cathode layer may get affected .Hence its better to use LiPON with out annealing (i.e. in amorphous phase)
Thank you.
Thank you very much for your response.
Is it not possible to get crystalline thin film without annealing??
During growth of thin film if we employ ion bombardment ,it can be possible.
Of course it depends on the type of thin film deposition technique we are using.In case of PVD it is possible..
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