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Lithium difluorophosphate as an additive

Number of visits: Date:2018-05-24 16:28:20
LiPO 2 F 2 was investigated as an electrolyte additive in LiNi 0.5-
Co 0.2 Mn 0.3 O 2 /graphite cells. The CV curves suggested that LiPO 2 F 2
could stabilize the SEI film formed on graphite anode, and
significantly decreased the charge-transfer resistance as depicted
in EIS data. In addition, the XPS results had demonstrated that such a
low impedance was attributed to the richer content of LiF and the
presence of Li 2 CO 3 in SEI film. Moreover, TEM and SEM also
intuitively demonstrated that LiPO 2 F 2 had a tremendous impact on
graphite while it exerted no side effect on cathode. Therefore, the
addition of 1 wt% LiPO 2 F 2 could significantly enhance the discharge
characteristics of full cells at various low temperatures and the
capacity retention had been increased from 79.9% to 96.7% at 0.5C
rate after 100 cycles at 0 ? C. These results all powerfully supported
that the addition of LiPO 2 F 2 improved the stability and conductivity
of the SEI film on graphite, which is helpful for the intercalation of Li +
into graphite and the better lithium kinetics on graphite surface,
leading to an improved low temperature and long cyclic perfor-
mance in LiNi 0.5 Co 0.2 Mn 0.3 O 2 /graphite cells

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