Improving the electrical performance of Lithium-ion battery using
SilicaCarbon anode through technique
Abstract
Nowadays, a hybrid composite SiO2/C has been paid attention to improving
battery performance in Li-ion batteries (LIBs) as the anode. However,
this material unexpectedly suffers from initial active lithium loss
caused by the solid electrolyte interface (SEI) formation leading to low
initial Coulombic efficiency and significantly reducing the initial
capacity. In order to solve these issues, pre-lithiation has been
considered an effective approach to limit active lithium loss and
increase cycling performance. This work focuses on the two most common
techniques, including the direct contact method (CM) and the
electrochemical method in half-cell (EM). After the pre-lithiation
process, the anodes would be evaluated in full-cell with
LiNi0.6Mn0.2Co0.2O2 (NMC622) cathode. According to electrochemical
properties evaluations, pre-lithiation could enhance discharged capacity
and initial coulombic efficiency. Without the pre-lithiation method, the
discharged capacity in full-cell only witnessed 66.9 mAh.g-1, while CM
and EM methods illustrated a better battery performance. In detail, EM
exhibited a higher discharged capacity and initial coulombic efficiency
(137.06 mAh.g-1 and 99.08%, respectively) compared to CM (99.08 mAh.g-1
and 93.23%) method. Besides, the capacity retention using EM achieved
71.4% and the discharged capacity illustrated 97.87 mAh.g-1 after 100
cycles, which is better than using CM, which only showed 71.40 mAh.g-1.