Coating of NCM 851005 Cathode Material with Al0@Al2O3 and Subsequent Treatment with Anhydrous HF

The volatile alane (H 2 AlO t Bu) 2 decomposes into amorphous HAlO or Al 0 @Al 2 O 3 nanoparticles upon heating, depending on the time and temperature. By coating the Ni-rich cathode material NCM851005 with this compound, the NCM’s cycling stability and electric conductivity were increased. Thus, the coating not only yielded Al 0 @Al 2 O 3 nanoparticles but also, by reaction with surface Li 2 O/LiOH/Li 2 CO 3 , a Li + conductive LiAlO 2 layer. The coatings with 0.3 and 0.1 wt% (H 2 AlO t Bu) 2 , respectively, significantly reduced the resistance build-up to 70/115% after 280 cycles at 1 C (351% without coating). Upon treatment of the 0.3 wt% Al-coating with two equivalents of anhydrous HF, the Al 2 O 3 and LiAlO 2 parts were transformed into a Li[AlO(OH)F] layer, which yielded better capacity retention, retaining the low impedance build-up of only +120% (280 cycles at 1 C). This treatment, however, proved to have the same effect as simply reducing the amount of (H 2 AlO t Bu) 2 for the coating to 0.1%.