Abstract
The electrochemical intercalation of lithium into chromium (V)-containing oxides isostructural with β- and γ-Li3PO4 has been studied. β-Li3CrO4 can reversibly intercalate around 1 mole of Li ions per formula unit to give Li3 + xCrO4: 0 < x < 1 with a discharge capacity of 196 mAh g-1; electrochemical data indicate the possible existence of a two-phase region in the approximate range 0.3 < x < 0.8. Fully intercalated material appears to have a γ-related structure. γ-Li3.5Cr0.5Ge0.5O4, with a LISICON structure can reversibly intercalate up to 0.5 moles of Li ions per formula unit to give Li3.5 + xCr0.5Ge0.5O4: 0 < x < 0.5. During intercalation, the γ-phase transforms into a β-phase which is retained on deintercalation. The volume changes associated with (de) intercalation of both β and γ structures are small, ≪ 1%. During the β → γ transition, the orthorhombic c axis, and the unit cell volume, increase by ~ 2%.
Original language | English |
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Pages (from-to) | 309-314 |
Number of pages | 6 |
Journal | Solid State Ionics |
Volume | 76 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - Mar 1995 |
Externally published | Yes |
Keywords
- Intercalation
- Lithium insertion
- LISICON