Electrochemical lithium ion intercalation in Li 0.5Ni 0.25TiOPO 4 examined by in situ X-ray diffraction

• The complex structural transformations of Li 0.5Ni 0.25TiOPO 4 during electrochemical lithiation have been examined by in situ X-ray diffraction. During the first lithiation two structural changes take place: first a transition to a second monoclinic phase (a = 9.085(4), b = 8.414(5), c = 6.886(5), β = 99.85(4)) and secondly a transition to a third phase with limited long-range order. The third phase is held together by a network of corner sharing Ti-O octahedra and phosphate ions with disordered Ni-Li channels. During delithiation the third phase is partially transformed back to a slightly disordered original phase, Li 0.5Ni 0.25TiOPO 4 without formation of the second intermediate phase. These phase transitions correspond well to the different voltage plateaus that this material shows during electrochemical cycling.

Ämnesord

NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)

Nyckelord

Batteries

In situ X-ray powder diffraction

Lithium intercalation compounds

Corner sharing

De-lithiation

Electrochemical cycling

Electrochemical lithiation

In-situ

Intermediate phase

Lithiation

Lithium Intercalation

Lithium ions

Long range orders

Monoclinic phase

Phosphate ions

Structural change

Structural transformation

Third phase

Solar cells

X ray diffraction

X ray powder diffraction

Lithium

Inorganic chemistry

Oorganisk kemi

Kemi med inriktning mot oorganisk kemi

Chemistry with specialization in Inorganic Chemistry

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