The migration behavior of Li ions in amorphous LixV2O5 which contained 5mol%P2O5 was studied by using 7Li nuclear magnetic resonance methods. It was deduced from the relaxation time that both the pre-exponential factor and the activation energy decreased with increasing x-value (tables 140 and 141). It was deduced from the second moment of the data that the Li ions occupied sites which were about 0.29nm apart in a large cavity. The latter was similar to that in crystalline V2O5. It was suggested that there were 3 types of site for the Li+ ion in the cavity, and that the ion changed from one site to another at an x-value of about 0.6.

T.Asai, S.Sugimoto, S.Kawai, S.Okada, J.Yamaki: Materials Research Bulletin, 1989, 24[1], 75-82

 

 

 

Table 140

Diffusivity of Li in LixV2O5

 

x

D (cm2/s)

0.2

4.0 x 10-14

0.6

6.6 x 10-13

1.0

1.2 x 10-12

2.0

2.8 x 10-12

 

 

 

Table 141

Diffusion Parameters for Li in LixV2O5

 

x

Do (cm2/s)

E (kJ/mol)

0.2

1.2 x 10-7

48.0

0.6

7.6 x 10-8

28.2

1.0

3.0 x 10-8

25.0

2.0

3.0 x 10-8

23.0