Conductivity and applications of Li-biphenyl-1,2-dimethoxyethane solution for lithium ion batteries

Abstract

The total conductivity of Li-biphenyl-1,2-dimethoxyethane solution (Li x Bp(DME) 9.65 , Bp = biphenyl, DME = 1,2dimethoxyethane, x = 0.25, 0.50, 1.00, 1.50, 2.00) is measured by impedance spectroscopy at a temperature range from 0 • C to 40 • C. The Li 1.50 Bp(DME) 9.65 has the highest total conductivity 10.7 mS/cm. The conductivity obeys Arrhenius law with the activation energy (E a(x=0.50) = 0.014 eV, E a(x=1.00) = 0.046 eV). The ionic conductivity and electronic conductivity of Li x Bp(DME) 9.65 solutions are investigated at 20 • C using the isothermal transient ionic current (ITIC) technique with an ion-blocking stainless steal electrode. The ionic conductivity and electronic conductivity of Li 1.00 Bp(DME) 9.65 are measured as 4.5 mS/cm and 6.6 mS/cm, respectively. The Li 1.00 Bp(DME) 9.65 solution is tested as an anode material of half liquid lithium ion battery due to the coexistence of electronic conductivity and ionic conductivity. The lithium iron phosphate (LFP) and Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 (LATP) are chosen to be the counter electrode and electrolyte, respectively. The assembled cell is cycled in the voltage range of 2.2 V-3.75 V at a current density of 50 mA/g. The potential of Li 1.00 Bp(DME) 9.65 solution is about 0.3 V vs. Li + /Li, which indicates the solution has a strong reducibility. The Li 1.00 Bp(DME) 9.65 solution is also used to prelithiate the anode material with low first efficiency, such as hard carbon, soft carbon and silicon.

Molecularly Tailored Lithium–Arene Complex Enables Chemical Prelithiation of High‐Capacity Lithium‐Ion Battery Anodes

“…This is consistent with the partially improved initial CE of Si (Supporting Information, Table S1) or the results in previous attempts using chemical reagents with redox potentials higher than that of Si. [11,15] Thus,o ur result supports that the chemical prelithiation with tailored LACs allowing active Li accommodation in SiO x is necessary…”

Insight into the Evolution of Voids at the NASICON/Na Interface and Suppressing Void Accumulation by a Semiliquid Wetting Strategy

“…The ionic and electronic conductivities of NBP were measured by the isothermal transient ionic current (ITIC) method with a constant voltage of 0.1 V, as described in the literature. , The results are shown in Figure S2. As 2 M NBP shows the highest ionic conductivity of ∼3.9 × 10 –3 S cm –2 , it was used to prepare the semiliquid wetting agent in this work.…”

Application of Liquid Metal Electrodes in Electrochemical Energy Storage

“…27−30 In addition, this type of liquid anode has been applied to other battery systems, such as seawater batteries, 31,32 liquid flow batteries, 33 organic liquid cathode batteries, 34 and LiFePO 4 half-solid batteries. 35 Peng et al 36,37 has recently demonstrated the best cycle stability and highest efficiency to date of liquid lithium metal solution batteries using high-voltage solid cathodes on the basis of systematic and comprehensive solubility and conductivity analysis of Li-BP-DME liquid anodes. In 2023, Peng et al assembled the organic lithium battery with Li 7 P 3 S 11 , and the liquid lithium metal anode Li-BP-DME showed a longer cycle life and higher capacity compared with the organic lithium battery using the liquid electrolyte.…”