Improving the Safety of Lithium-Ion Battery via a Redox Shuttle Additive 2,5-Di-tert-butyl-1,4-bis(2-methoxyethoxy)benzene (DBBB)

Abstract

2,5-Di- tert-butyl-1,4-bis(2-methoxyethoxy)benzene (DBBB) is studied as a redox shuttle additive for overcharge protection for a 1.5 Ah graphite/C-LFP lithium-ion pouch cell for the first time. The electrochemical performance demonstrated that the protecting additive remains inert during the extended standard cycling for 4000 cycles. When a 100% overcharge is introduced in the charging protocol, the baseline cell fails rapidly during the first abusive event, whereas the cell containing DBBB additive withstands 700 overcharge cycles with 87% capacity retention and no gas evolution or cell swelling was observed. It is the first time the effectiveness of the DBBB as overcharge protection additive in a large pouch cell format is demonstrated.

Transport of Ions, Molecules, and Electrons across the Solid Electrolyte Interphase: What Is Our Current Level of Understanding?

“…reported on a battery with redox molecules being oxidized at the cathode upon overcharging, diffusing to the graphite‐based anode, and being reduced at the anode despite the existence of the SEI. [ 61 ] Indeed, the charge flow while overcharging observed in this experimental study is too high to be caused by an oxidation of all redox molecules in the electrolyte at the cathode and a Li intercalation into the anode, since the charge flow would stop after oxidation of all redox molecules (see the Supporting information). Accordingly, a redox shuttle mechanism seems likely.…”

Accumulation of Glassy Poly(ethylene oxide) Anchored in a Covalent Organic Framework as a Solid-State Li+ Electrolyte

“…This is because of a low rate and resultant partial reduction of Fe 3+ in LiFePO 4 at the electrolyte–electrode interface. This is often observed in other organic polymer–LiFePO 4 systems, and chemical/engineering optimization is required to reduce the overcharge. − Although the tested current density was small, the demonstration in all-solid-state at 100 °C proves that COF-PEO- x -Li can act as solid-state Li electrolytes having sufficient thermal/chemical/mechanical properties.…”

Influence of the Formation Current Density on the Transport Properties of Galvanostatically Formed Model‐Type Solid Electrolyte Interphases

“…Furthermore, transport selectivities seem to play an important role for overcharge‐protection in lithium‐ion batteries. Several groups reported that overcharge‐protection additives, which are redox molecules, work successfully in conventional lithium‐ion batteries. In these batteries, overcharging leads to oxidation of the redox molecules at the positive electrode, diffusion of the redox molecules to the negative electrode and reduction of the redox molecules at the negative electrode, despite the existence of the SEI.…”