Impact of tripropyl borate on life and impedance of lithium-ion cells

Insight into the capacity fading of layered lithium-rich oxides and its suppression via a film-forming electrolyte additive

“…Furthermore, our previous work demonstrated that boracic electrolyte additives, such as trimethyl borate (TMB) and triethyl borate (TEB), show great capability to enhance the cycling stability of LLOs. 33,35 Although tripropyl borate (TPB), whose structure is similar to that of TMB and TEB, has been demonstrated to improve the capacity retention and rate capability of a MCMB/Li 1.1 [Mn 1/3 Ni 1/3 Co 1/3 ] 0.9 O 2 full cell as an anion receptor additive, 46 no prior study has been performed to investigate its lm-forming capability and inuence on the cycling stability of high voltage LLOs.…”

Effect of Anion Receptor Additives on Electrochemical Performance of Lithium-Ion Batteries

“…Figure also shows the molecular structure of TPFPB and tripropyl borate (TPB), whose electrochemical data had been reported previously , and were further investigated by ab initio calculations in the present study.…”

“…Anion receptors are a class of organic ligand that can efficiently and selectively coordinate with anions and negatively charged functional groups like carboxylate and phosphate through π−π coordination bonds or hydrogen bonds. − The fundamental research on this subject, anion coordination chemistry, can be traced back to the 1960s, during which Simmons and co-workers reported that macrobicyclic amines with the proper cavity diameter can efficiently coordinate with halide anions . Simmons’s report immediately triggered increasing interest in exploring new anion receptors for higher efficiency and selectivity. − After decades of research in this area, anion receptors have successfully gained important applications in chemical and biochemical systems for anion coordination, recognition, and transportation , as well as nonaqueous electrolytes for lithium batteries. − …”

High Performance Lithium-Ion Batteries Using Fluorinated Compounds

“…It was reported that the type of substitution group R has a significant effect on the electrochemical performance of lithium-ion cells using anion receptors as the electrolyte additive. Chen et al found that the addition of a small amount of tripropyl borate (TPB, R = -OC 3 H 7 ) (≤0.1 wt%) could lead to improved capacity retention, as well as a slight reduction of the cell impedance [31]. However, a high concentration of TPB degraded cell performance, which was speculated to originate from the oxidation of TPB at elevated temperature.…”

“…Therefore, the addition of a small amount of anion receptor to the nonaqueous electrolyte can improve both the rate capabilities [28] and the capacity retention [28][29][30][31] of lithium-ion cells.…”