Chemical and electrochemical insertion techniques were used to prepare hexagonal alkali metal bronzes. The electrochemical diffusion coefficients of Li+ were studied, as a function of composition, by using current-pulse relaxation techniques. The diffusion coefficients for LixWO3 were initially as high as 1.5 x 10-8cm2/s, when x was equal to 0.48, and decreased to 1.1 x 10-10cm2/s when x was equal to 1.13. Coefficients of 3.2 x 10-9 and 1.3 x 10-9cm2/s were found for LixK0.26WO3 at x = 0.13 and x = 0.33, respectively. A slightly different trend was observed in the LixNayWO3 system (table 73).
R.C.T.Slade, B.C.West, G.P.Hall: Solid State Ionics, 1989, 32-33, 154-61
Table 73
Electrochemical Diffusion of Li in Hexagonal Bronzes
Bronze | x | D (cm2/s) |
LixWO3 | 0.48 | 1.48 x 10-8 |
LixWO3 | 1.13 | 1.07 x 10-10 |
LixK0.20WO3 | 0.01 | 4.07 x 10-8 |
LixK0.20WO3 | 0.12 | 4.07 x 10-10 |
LixK0.20WO3 | 0.19 | 3.80 x 10-10 |
LixK0.20WO3 | 0.33 | 9.12 x 10-9 |
LixK0.20WO3 | 0.49 | 1.35 x 10-10 |
LixK0.20WO3 | 0.54 | 3.24 x 10-9 |
LixK0.20WO3 | 0.61 | 2.75 x 10-10 |
LixK0.20WO3 | 0.65 | 2.82 x 10-10 |
LixK0.26WO3 | 0.13 | 3.24 x 10-9 |
LixK0.26WO3 | 0.33 | 1.35 x 10-9 |
LixNa0.20WO3 | 0.03 | 1.29 x 10-9 |
LixNa0.20WO3 | 0.07 | 2.19 x 10-11 |
LixNa0.20WO3 | 0.12 | 1.05 x 10-10 |
LixNa0.20WO3 | 0.16 | 1.51 x 10-10 |
LixNa0.20WO3 | 0.20 | 3.02 x 10-10 |
LixNa0.20WO3 | 0.24 | 6.31 x 10-10 |
LixNa0.20WO3 | 0.28 | 1.55 x 10-9 |
LixNa0.20WO3 | 0.32 | 2.00 x 10-9 |
LixNa0.30WO3 | 0.05 | 5.13 x 10-14 |
LixNa0.30WO3 | 0.10 | 1.48 x 10-12 |
LixNa0.30WO3 | 0.16 | 2.75 x 10-12 |
LixNa0.30WO3 | 0.23 | 5.89 x 10-12 |
LixNa0.30WO3 | 0.29 | 3.47 x 10-11 |
LixNa0.30WO3 | 0.34 | 5.50 x 10-11 |
LixNa0.30WO3 | 0.40 | 6.17 x 10-11 |
LixNa0.30WO3 | 0.45 | 4.68 x 10-11 |