Overcharge Protection up to 5.0 Volts
Batteries currently operate at around 4,2 volts but the objective is to arrive at up to 5V. However, well-known compounds for overcharge protection such as BP (Biphenyl) and CHB (Cyclcohexyl benzene) start to work already at 4.5/4.6v the CHB which leads to battery shutdown. TAB has a higher oxidation voltage so it's safe to use between 4.2 and 4.9 volts without damaging the battery.
At the stage of overcharge in the battery, TAB can prevent the ignition and explosion of the battery through the following mechanisms, such as CID-reverse and an increase in internal impedance.
Particularly, through oxidation of TAB, it can directly generate gas along with heat generation, or it can cause the shut-down of a separator by an increase in internal temperature that results from heat generation.
Therefore, TAB contributes to the improvement in the risk of the battery under overcharge or thermal runaway situation.
Safety Without Compromising on Performance
Battery additives need to increase safety but not at the expense of performance. As illustrated by the graphs below, the addition of TAB does not affect cell cycling.
TAB also has better high temperature storage performance with less gas generation and better residual capacity compared to CHB.
Effective Overcharge Protection at Lower Usage Levels
TAB acts as a radical interceptor and redox shuttle to increase the safety of lithium batteries. CHB works like a monomer that gets polymerized and is therefore consumed as it is used and can eventually run out. However, TAB works more like an initiator and is not consumed, which is why TAB can be used at lower levels.