Anode Properties of Lithium Storage Alloy Electrodes Prepared by Gas-Deposition

Abstract

To improve the charge-discharge cycle stability, we adopted a gas-deposition ͑GD͒ method to prepare lithium storage alloy electrodes. The resulting Mg 2 Ge GD film exhibited an increase in both charge and discharge capacities in comparison with the conventional bulk electrode, suggesting improvement of adhesion between the Mg 2 Ge layer and Cu foil. Furthermore, the cyclability of the GD film electrode was noticeably superior to that of the bulk electrode. The discharge capacity of the film electrode maintained 35% of the initial capacity, even at the 200th cycle. It is noteworthy that the GD-film electrode was able to operate at very large current densities.

Electrochemical Na-insertion/Extraction Properties of Sn–P Anodes

“…13 This method is very beneficial for evaluating an original electrochemical property of an active material because it does not require any binder and conductive additive to prepare electrodes. GD was performed by using a nozzle with 0.5 mm in diameter, an Ar carrier gas with a purity of 99.99% under a differential pressure of 7.0 © 10 5 Pa, and a current collector of Cu foil substrate with 20 µm in thickness.…”

Application of electrolyte using novel ionic liquid to Si thick film anode of Li-ion battery

“…An aerosol consisting of an Ar gas (differential pressure 7 × 10 5 Pa) and active material of a commercial Si powder was generated in the guide tube, and gushed from a nozzle with a diameter of 0.8 mm to the Cu substrate in the chamber with a base pressure of 8 Pa. The particle size of the Si powder (Wako Pure Chemical Industries, Ltd., 99%) mainly ranges from 0.2 to 2 m. Further detailed conditions of the gas-deposition have been described in our previous papers [6,7]. The weight of deposited Si on the substrate was 30-60 g. The film thickness of the active material was roughly estimated to be 3-6 m by a cross-sectional observation using a scanning electron microscope (SEM, JSM-5200; JEOL Ltd.).…”

“…In this method, an aerosol consisting of raw particles and a carrier gas gushes from a nozzle to a substrate with a high speed in the range of the sonic speed. For preparing electrodes, we have demonstrated that the GD method gives various advantages including (i) the strong adhesion between the active material particles as well as between the particles and the substrate, (ii) the nearly unchanged composition in thick film formed without atomization (e.g., vaporization) of the particles such as vaporization, and (iii) the formation of interstitial spaces between the particles, which is a favorable structure to release the stress induced by the volumetric change of the active material particles [6,7]. By using the gas-deposition of Si-based materials, we have prepared GD-film electrodes with both a large capacity and better cycling performance [8][9][10][11].…”

Improved Anode Performance of Ni-P-Coated Si Thick-Film Electrodes for Li-Ion Battery

“…Thick-film electrodes of Ni-P-coated Si were prepared on Cu foil substrates by the GD method. 11 The weight of the deposited active materials in this study was 0.0170.020 mg. The indentation elastic modulus of the electrodes before charge-discharge cycle was measured by an indentation test using a dynamic ultra-micro hardness tester (DUH-211S, Shimadzu Co. Ltd.).…”

“…As other approach, we have prepared composite thick-film electrodes of Si coated with Ru, 7 Cu, 8 Ni 9 layers, and Ni/Cu multilayer 10 by using an electroless deposition (ELD) method and a successive gas-deposition (GD) method. 11 It has been revealed that the coated metal layers on the Si particles can play important roles in increasing the electrical conductivity of active material 8 and in releasing the stress induced by the volumetric changes of Si. 9 Among some coated layers, we have obtained the best performance when Ni-P with the amount of 0.2 wt.% was coated on Si particles by ELD in an acid bath.…”