Battery anode

Anode Corrosion Reaction. Ziac might at first appear to be an unusual choice for battery anode material, because the metal is thermodynamically unstable ia contact with water... 

The cast grids are made into battery anode and cathode plates by the application of a lead oxide paste of 70 percent lead oxide (PbO) and 30 percent metallic lead. Lead ingots are tumbled in a ball mill with airproducing lead oxide and fine lead dust (referred to as leady oxide ). Leady oxide particulates are entrained in the mill exhaust air, which is treated sequentially by a cyclone separator and fabric filter. The used fabric filter bags are shipped to a RCRA-permitled commercially operated ha2ardous waste landfill located in Colorado. The leady oxide production process does not produce wastewater. 

AnnulUeren, v.t. annul, cancel, strike out. Anoden-batterie, /. anode battery, B battery, -dichte, /. anode density, anodic density, -raum, m. anode region, space around the Anode, -schlamm, m. anode slime, anode... 

Aluminum is directly applied in its metallic form when it serves as battery anode. The battery concepts considered are in general single-use types (primary batteries). The most developed systems belong to the metal-air batteries, using the reduction of atmospheric oxygen as the cathode reaction, e.g., (-) A1 / KOH / 02 (+) or (-) A1 / seawater / 02 (+). The main discharge reactions are ... 

Although one of the most common storage batteries is called the nickel/cadmium system ( NiCad ), correctly written (-)Cd/KOH/NiO(OH)(+), cadmium is not usually applied as a metal to form a battery anode. The same can be said with regard to the silver/cadmium [(-) Cd / KOH / AgO (+)] and the MerCad battery [(-)Cd/KOH/HgO(+)]. The metallic negative in these cases may be formed starting with cadmium hydroxide, incorporated in the pore system of a sintered nickel plate or pressed upon a nickel-plated steel current collector (pocket plates), which is subsequently converted to cadmium metal by electrochemical reduction inside the cell (type AB2C2). This operation is done by the customers when they start the application of these (storage)... 

However, under these conditions, the energy density is lower than with the (CH> ), electrode, whereas, on the other hand, the coulombic efficiencies attain values of 98 %. In some cases PA in its n-doped form has also been used as battery anode (cell type 3) 190,191,241) -j-jjg discharging reaction in a cell with a TiS2 cathode is as follows ... 

H. J. Santner, M. R. Wagner, G. Fauler, P. Raimann, C. Veit, K. C. Moller, J. O. Besenhard, M. Winter (2003). An Overview on SEI Formation Processes of Lithium Battery Anodes in Organic Solvent Based Electrolytes, Taipei Power Forum and Exhibition (TPF2003), December 1-3, 2003, Taipei (Taiwan) Invited lecture. 

Barsukov I., Henry F., Doninger J., Gallego M., Huerta T., Girkant R. and Derwin D. On the electrochemical performance of lithium-ion battery anodes based on natural graphite with various surface properties. ITE Letters on Batteries, New Technologies Medicine, V.4, N.2 (2003), 163-166. 

Yoshio, M., Wang, H., Fukuda, Abe, T., and Ogumi, Z., Soft carbon-coated hard carbon beads as a lithium-ion battery anode material, Chemistry Letters (2003) Vol. 32, No. 12, 1130-1131. 

Yoshio, M., Wang, H., Fukuka, K., Hara, Y., and Adachi, Y., Effect of carbon coating on electrochemical performance of treated natural graphite as lithium-ion battery anode material, J. of Electrochem. Soc. (2000) 147 (4) 1245-1250. 

Cadmium hydroxide is used in storage battery anodes, in nickel-cadmium and silver-cadmium storage batteries, and in cadmium plating. It also is used to prepare other cadmium salts. 

Danilov M.O., Melezhyk A.V. Carbon nano-structures as hydrogen-adsorbing materials for battery anodes. Russian J. of Applied Chemistry, 2004, 77(12), 1980-1984. 

Electrochemical deposition of lithium usually forms a fresh Li surface which is exposed to the solution phase. The newly formed surface reacts immediately with the solution species and thus becomes covered by surface films composed of reduction products of solution species. In any event, the surface films that cover these electrodes have a multilayer structure [49], resulting from a delicate balance among several types of possible reduction processes of solution species, dissolution-deposition cycles of surface species, and secondary reactions between surface species and solution components, as explained above. Consequently, the microscopic surface film structure may be mosaiclike, containing different regions of surface species. The structure and composition of these surface films determine the morphology of Li dissolution-deposition processes and, thus, the performance of Li electrodes as battery anodes. Due to the mosaic structure of the surface... 

There are reports that the surface chemistry of Li alloys is indeed largely modified, compared with Li metal electrodes [303], It appears that they are less reactive with solution species, as is expected. The morphology of Li deposition on Li alloys may also be largely modified and smooth, compared with Li deposition on Li substrates [302,304], A critical point in the use of Li alloys as battery anodes is the lithium diffusion rates into the alloys. Typical values of Li diffusion coefficient into alloys are 3-LiAl —> 7 16 9 cm2/s [305], Li44Sn —> 2 10 9 cm2/s [306], LiCd and LiZn —> 1010 cm2/s [307], It should be emphasized that it is very difficult to obtain reliable values of Li diffusion coefficient into Li alloys, and thus the above values provide only a rough approximation for diffusion rates of Li into alloys. However, it is clear that Li diffusion into Li alloys is a slow process, and thus is the rate-limiting process of these electrodes. Li deposition of rates above that of Li diffusion leads to the formation of a bulk metallic lithium layer on the alloy s surface which may be accompanied by mas-... 

FIGURE 17.9 In a lead-acid storage battery, anodes made of Pb alternate with cathodes of Pb coated with Pb02. The electrolyte is sulfuric acid. 

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