Oxidation/reduction chemical diffusion coefficients of Li⁺ from cyclic voltammetry.

Sample	D ox (cm2 s−1)	D red (cm2 s−1)
0% Cu	2.41 × 10−13	2.66 × 10−13
2.7% Cu	1.45 × 10−12	6.79 × 10−13
5.1% Cu	2.51 × 10−12	1.10 × 10−12
7.2% Cu	4.56 × 10−12	2.59 × 10−12