Abstract:
An alkali metal, solid cathode, nonaqueous electrochemical cell capable of delivering high current pulses, rapidly recovering its open circuit voltage and having high current capacity, is described. The stated benefits are realized by dissolving organic additives, preferably carbonate additives in the electrolyte. The carbonate additives have an O-X bond with a dissociation energy less than about 80 kcal/mol on either one or both sides of a carbonyl group wherein X is selected from the group consisting of C, O and N.
Abstract:
A high pulse power electrochemical cell comprising an alkali metal-aluminum alloy anode, a nickel anode current collector, a calendared mixed metal oxide cathode active material pressed onto a cathode current collector comprising aluminum and a nonaqueous electrolytic solution, is described. The electrolytic solution preferably comprises at least one ion-forming alkali metal salt of hexafluorophosphate with the alkali metal salt being similar to the alkali metal comprising the anode. Lithium is the preferred alkali metal. This cell system produces high current pulses and can be housed in a casing having a reduced volume with respect to conventional electrochemical systems. Additionally, the anode/electrolytic solution exhibits reduced voltage delay without comprising heat dissipation.
Abstract:
An electrolyte system (40) for use in connection with an electrochemical cell (10). The cell (10) includes a positive electrode (20) and a negative electrode (30) with the electrolyte system (40) disposed therebetween. The electrolyte system is a polymer gel electrolyte system including a liquid electrolyte species which may be either aqueous or non-aqueous and a polymer gel electrolyte support structure. The polymer gel electrolyte support structure includes at least a non woven first polymer and a second polymer which is adapted to absorb the electrolyte active species. The first polymer is a fibrous polymer to reduce swelling of the gel electrolyte in the presence of the electrolyte active species, and further to enhance mechanical integrity of the support structure.
Abstract:
A new non-aqueous electrolyte system for use in batteries, capacitors or electrochromic displays, and consisting essentially of an alkali or ammonium salt, a solvent mixture, and optionally a polymer is disclosesd. The new electrolyte system is characterised in that the solvent mixture comprises a mixture of ethylene carbonate (EC) and gamma -valerolactone ( gamma -VL), optionally containing one or more additional solvents selected from other organic carbonates, other lactones, esters and glymes, said system optionnaly being confined in a separator. The electrolyte system can be applied in a broad voltage range, has a conductivity higher than 10 S/cm at room temperature, and shows a high stability against reduction. The improved stability towards reduction is mirrored in a cycling efficiency which is superior to the cycling efficiency of known non-aqueous electrolyte systems.
Abstract translation:公开了一种用于电池,电容器或电致变色显示器,并且基本上由碱或铵盐,溶剂混合物和任选的聚合物组成的新的非水电解质体系。 新的电解质系统的特征在于溶剂混合物包含碳酸亚乙酯(EC)和γ-戊内酯(γ-VL)的混合物,任选地含有一种或多种另外的选自其它有机碳酸酯,其它内酯,酯和甘氨酸的溶剂, 所述系统选项被限制在分隔符中。 电解质体系可以在宽的电压范围内使用,导电率在室温下高于10 -3 S / cm,显示出高的抗还原稳定性。 改进的降低稳定性反映在循环效率上,其优于已知非水电解质体系的循环效率。
Abstract:
Novel fire-retardant electrolyte compositions are provided. These compositions comprise a lithium salt dissolved in a fire-retardant solvent selected from the group consisting of phosphates, phospholanes, cyclophosphazenes, silanes, fluorinated carbonates, fluorinated polyethers and mixtures thereof. The electrolyte composition optionally contains a CO2-generating compound. Also provided are fire-retardant batteries and fire-retardant conductive films formulated with such compositions, as well as methods of manufacturing such films.
Abstract:
Salts for use in nonaqueous electrolytes, and electrolytes and electrochemical generators including such materials. An exemplary compound for use as an electrolyte in an electrochemical cell has formula (I) wherein Mn+ is an ion of Li, Na, K, Ca, Mg, Zn, or Al; each of the moieties Y, Y', and Y'', are (a) or (b); the groups R and R' are separate halogenated alkyl groups of 1-4 carbon atoms, respectively or are joined together to constitute a unitary halogenated alkylene radical of from 2-4 carbon atoms linking Y and Y' and forming a ring structure which includes R, R', Y, Y', and the carbon atom to which Y and Y' are attached; the group R'' is an alkyl or haloalkyl radical of 1-4 carbon atoms or a halogenated phenyl group; n is an integer of 1-3 depending on the identity of the metal M; and metal ion Mn+ is an ion of Li, Na, Ca, Mg, Zn or Al when each of the Y-R, Y'-R', and Y''-R'' groups is SO¿2?CF3. In another exemplary compound, the -Y''-R'' group is replaced by Z, which is an electron-withdrawing substituent selected from the group consisting of -C(O)H, -NO2, -CN, -F, and perfluorinated alkyls and aryls containing no more than 8 carbons.
Abstract:
The addition of certain polymer compounds such as polybenzimidazole increases the capacity and cycle life of cadmium electrodes in nickel-cadmium batteries.
Abstract:
An Electrochemical cell having an oxidizable anode material (22), specifically lithium, a cathode current collector (24), and an electrolytic solution in contact with the anode material (22) and the cathode current collector (24). The solution comprises a solvent of a reducible liquid cathode material, specifically thionyl chloride, and an electrolyte solvent, specifically lithium tetrachloroaluminate, dissolved therein. The solute is present in an amount to produce in excess of 75% of its room temperature saturation concentration in the solvent.
Abstract:
A polymeric film useful as an interelectrode separator or electrolyte member in electrolytic devices, such as rechargeable batteries, comprises a copolymer of vinylidene fluoride and hexafluoropropylene, a medium to high-boiling plasticizer, and a finely divided inorganic filler which has been subjected to actinic radiation or thermal energy to cause crosslinking thereof in the presence of a crosslinking agent selected from the group consisting of an acrylate ester, di- or triallyl ester and a di- or triglycidyl ether.
Abstract:
This invention is directed to novel allyl carbonates and to solid electrolytes containing a solid matrix having incorporated therein allyl carbonates. The solid matrix is used in an electrolytic cell.