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Characterization of Electrolytic V2O5 coating on Pt for Lithium-Ion Battery
當鋰離子嵌入V2O5晶格時產生相變化(α→ε→δ')分別從x=0至0.2和0.6，δ'是一個擁有斜方晶系結構的相，晶格常數a=11.4388 Å b=8.8374 Å c=3.5793 Å，以前並末被發現。
Cathodic V2O5 deposition on Pt was conducted in VOSO4 aqueous solution. Compared with cathodic polarization curves in Na2SO4,H2SO4, and HCl, reaction in VOSO4 could be divided into 3 stage :
A uniform film of V2O5 film was conducted at Ta for tb and its particle sizes was about 0.25μm.
CV and charge-discharge tests revealed that the reaction were reversible between 2.8 V and 3.8 V versus Li/Li+ for x≦1 . Two discharging plateaus were found at 3.2 V and 3.4 V, respectively and its discharge capacity is about 140 mAh/g.
Results of XRD verified that the lattice parameters of orthorhombicαphase did not change after charge-discharge cycle tests. However, the phase structure changed from α to ε and δ' as x increased from o to 0.2 and to 0.6, respectively. The δ'( a=11.4388 Å b=8.8374 Å c=3.5793 Å )was a new orthorhombic phase with a=11.4388 Å b=8.8374 Å c=3.5793 Å, which was different from δ and not found before.
|Appears in Collections:||材料科學與工程學系|
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