vacuum before use. Hexachlorocyclotriphosphazene (HCCP, 99%), aluminum
trichloride (AlCl3, 99.9%), 2-methoxyethylamine (99%),
3-methoxypropylamine (99%), n-butyllithium (2.5 M
in hexanes), and anhydrous tetrahydrofuran (THF; 99.9%) were purchased
from Sigma-Aldrich and used without further purification. 2,2,2-Trifluoroethylamine
(98%), Li foil (99.9%), trimethylamine (TEA, 99%), anhydrous acetonitrile
(ACN; 99.8%), and anhydrous dimethyl sulfoxide (DMSO; 99.8%) were
purchased from Fisher Scientific and used as received. LiFePO4 (LFP, 99.5%; Gelon) and Super C45 Carbon Black were dried
at 60 °C before use. All synthesis procedures were carried out
on a Schlenk line under N2, and all other air- and/or moisture-sensitive
procedures were carried out in an Ar-filled glovebox (H2O and O2 less than 1 ppm).