Research Development on Sodium-Ion Batteries

Electrolytes and interphases in Li-ion batteries and beyond.

Energy-storage technologies, including electrical double-layer capacitors and rechargeable batteries, have attracted significant attention for applications in portable electronic devices, electric vehicles, bulk electricity storage at power stations, and “load leveling” of renewable sources, such as solar energy and wind power. Transforming lithium batteries and electric double-layer capacitors requires a step change in the science underpinning these devices, including the discovery of new materials, new electrochemistry, and an increased understanding of the processes on which the devices depend. The Review will consider some of the current scientific issues underpinning lithium batteries and electric double-layer capacitors.

Challenges Facing Lithium Batteries and Electrical Double‐Layer Capacitors

Nano- and bulk-silicon-based insertion anodes for lithium-ion secondary cells

A review of the electrochemical performance of alloy anodes for lithium-ion batteries

Carbon-coated Si has been prepared by a thermal vapor decomposition method. Its electrochemical performance has been investigated by charge/discharge tests, cyclic voltammetric experiments, differential scanning calorimetry, and -nuclear magnetic resonance, etc. This kind of material demonstrates good electrochemical performance as an anode material for lithium-ion batteries. The improvement in the electrochemical performance of Si is mainly attributed to the effect of carbon coating. © 2002 The Electrochemical Society. All rights reserved.

https://iopscience.iop.org/article/10.1149/1.1518988/pdf

Carbon-Coated Si as a Lithium-Ion Battery Anode Material

The kinetics of lithium ion transfer at an interface between graphite and liquid electrolyte was studied by ac impedance spectroscopy. Using highly oriented pyrolytic graphite (HOPG) as a model electrode, we evaluated the activation energies of the interfacial lithium ion transfer from the temperature dependences of the interfacial conductivities. When a binary electrolyte consisting of LiClO4 dissolved in a mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC) (1:1 by volume) was used, the activation energy of the interfacial lithium ion transfer was 58 kJ mol−1, while an electrolyte consisting of LiClO4 dissolved in DMC gave an activation energy of 40 kJ mol−1. A calculation with the density functional theory clarified that the solvation ability of EC is higher than that of DMC. Therefore, we concluded that the activation energies of the interfacial lithium ion transfer at graphite reflected the energies for the desolvation of lithium ion from the solvent molecule. Furthermore, the activation ...

Kinetics of lithium ion transfer at the interface between graphite and liquid electrolytes: effects of solvent and surface film.

The kinetics of the electrochemical insertion and extraction of lithium ion at silicon monoxide (SiO) were investigated by ac impedance spectroscopy. The resultant Nyquist plots showed two semicircles at high and middle frequency regions. These two semicircles were attributed to lithium-ion transport resistance in a surface film and alloying reaction resistance (charge-transfer resistance), respectively. We evaluated the activation energies of the charge-transfer reaction from the temperature dependences of the interfacial conductivities. When an ethylene-carbonate-based electrolyte was used, the activation energy of the charge transfer was 32 kJ mol ―1 . This activation energy was much smaller than those at graphite electrode or positive electrode materials (around 50 kJ mol ―1 or more). Based on these results, the charge transfer at SiO is exceptionally fast compared to those at other insertion materials. Furthermore, the activation energies of the charge transfer at SiO remained unchanged in various electrolytes. These results suggest that the charge-transfer kinetics at SiO is not influenced by the desolvation of lithium ion from solvent molecules.

/pdf/kinetics-of-electrochemical-insertion-and-extraction-of-k99m3zq0nr.pdf

Kinetics of Electrochemical Insertion and Extraction of Lithium Ion at SiO

The charge−discharge behaviors of natural graphite in propylene carbonate (PC):dimethyl carbonate (DMC) mixed solutions were investigated after a solid electrolyte interface (SEI) was formed in an ...

Correlation between Charge−Discharge Behavior of Graphite and Solvation Structure of the Lithium Ion in Propylene Carbonate-Containing Electrolytes

Lithium-ion transfer through the lanthanum lithium titanate/LiClO4-concentrated propylene carbonate (PC) solution interface was investigated by the ac impedance method. Charge-transfer resistance (Rct) across the solid/liquid interface was observed and the interfacial activation energy was calculated from temperature dependency of Rct. The activation energies for interfacial Li+-ion transfer were invariable for 1 mol dm−3 and Li+/PC = 1/3 (by molar ratio) solution, but about 10 kJ mol−1 higher for Li+/PC = 1/2 solution. Raman spectra showed that the contact ion pair was formed in the Li+/PC = 1/2 solution. These results suggest that the activation energy for the cleavage of the ion−ion interaction process was higher than that for the desolvation process; that is, the cleavage of the ion−ion interaction was the rate-determining step for the solid/concentrated solution.

Zempachi Ogumi

Papers

Carbon-Coated Si as a Lithium-Ion Battery Anode Material

Kinetics of lithium ion transfer at the interface between graphite and liquid electrolytes: effects of solvent and surface film.

Kinetics of Electrochemical Insertion and Extraction of Lithium Ion at SiO

Correlation between Charge−Discharge Behavior of Graphite and Solvation Structure of the Lithium Ion in Propylene Carbonate-Containing Electrolytes

Li+-Ion Transfer through the Interface between Li+-Ion Conductive Ceramic Electrolyte and Li+-Ion-Concentrated Propylene Carbonate Solution