Charge–Discharge Behavior of Lithium-Ion Batteries Using a Polymer Electrolyte Bearing High-Density Functional Groups

Abstract

Lithium-ion batteries (LIBs) have become crucial for various applications, but carbonate-based liquid solvents, commonly used in their electrolytes, suffer from the flammability and exchange dynamic of lithium-ion movement in electrolytes. To address these issues, poly(ethoxycarbonylmethylene) (PECM) with a dense distribution of functional ester groups was evaluated as a polymer electrolyte in LIBs. The polymer was shown to be polar aprotic with an E T (30) value of 43.85 kcal mol −1 and to offer improved solvation of cations. Polymer electrolytes (PEs) in combination with LiTFSI showed a glass transition temperature in the range of 10−33 °C. PEs demonstrated good ionic conductivity within the range of 9.76 × 10 −5 −3.08 × 10 −4 S cm −1 at 51 °C, lithium-ion transference number between 0.80 and 0.98, and activation energy of diffusion within 27.4−43.0 kJ mol −1 . The PECM-based cathodic half-cell exhibited good rate capacity at varied current densities, and long-cycle performance showed 80% capacity retention at 0.2 C for more than 100 cycles. The effect of polarity on the conductivity and transport number and interfacial compatibility with the cathode show promise as an alternative electrolyte material for future lithium-ion battery applications.

Water-soluble densely functionalized poly(hydroxycarbonylmethylene) binder for higher-performance hard carbon anode-based sodium-ion batteries

“…The growing demand for energy storage systems has led to a search for low-cost rechargeable batteries based on abundant resources. 1 SIBs have become a promising alternative to lithium ion batteries, 2 potassium ion batteries 3 and zinc ion batteries 4 due to the unlimited sodium resources in seawater and salt deposits 5,6 and safe shipping at 0 V when Al is used as a current collector on the anode. 7 Moreover, the chemistry of lithium and sodium is similar; sodium is the lightest and smallest alkali metal after lithium.…”

Robust Electrochemical Performance of LIBs Using a Polymethylene-Based High-Density Carboxylic Acid Binder in Graphite Anodes

“…Carbon-based graphite anodes have revolutionized energy storage and are widely used in various lithium-ion battery (LIB) applications. LIBs offer several advantages including high energy density, long cycle life, and low self-discharge, leading to their ever-increasing market demand. , The continuous pursuit of enhancing LIB performance, energy density, and safety has prompted researchers to explore various aspects of battery components. − …”