摘要:
An electrochemical cell with an electrolyte of an ionically conductive material comprised of a salt diluted in a liquid solvent. The salt is represented by one of the following formulas: ##STR1##
摘要翻译:具有离子导电材料的电解质的电化学电池由在液体溶剂中稀释的盐组成。 盐由下式表示:M [RFSO 2 NSO 2 R'F]; M [RFSO2NCOR'F]; [RFCONCOR'F];
摘要:
Electrochemical generator, the electrolyte of which is made of a macromolecular material comprising a salt in solution and of which the positive electrode is a composite electrode which comprises as active material a metallic compound adapted to be reduced by the cation of the salt in solution by generating during this reduction new species which can include the zero oxidation degree metal, said generator being able to operate reversibly at ambient temperature.
摘要:
A process for preparing an alkali metal oxyanion electrode material having a carbon coating deposited by a thermal treatment, said process comprising a thermal step under a humidified atmosphere of: (i) said alkali metal oxyanion electrode material having a carbon coating deposited by a thermal treatment; (ii) precursors of said alkali metal oxyanion electrode material and an organic precursor of carbon; or (iii) said alkali metal oxyanion electrode material and an organic precursor of carbon, wherein said thermal step is performed at a temperature in the range of about 300° C. to about 950° C.
摘要:
A process for synthesizing particles of an oxide corresponding to a formula selected from: Li4Ti5O12; Li(4-α)ZβTi5O12; and Li4ZαTi(5-β)O12, said process including the steps of: a) preparing an intimately dispersed ternary mixture of TiOx—LiZY-carbon, wherein x is a number between 1 and 2, z is 1 or 2, Y is a radical chosen from the group consisting of CO3, OH, O and TiO3 or a mixture thereof, and the carbon is a carbon powder selected from the group consisting of natural or artificial graphite, carbon black, Shawinigan black, Ketjen black and cokes; b) heating the dispersion at a temperature of between 400 and 1,000° C.; and c) if appropriate, adding a source of at least one metal Z to the ternary mixture, wherein the operating conditions are chosen in such a way as to yield a conversion of the initial products respectively into Li4Ti5O12, Li(4-α)ZαTi5O12, Li4ZβTi(5-β)O12.
摘要翻译:一种合成相应于下式的氧化物颗粒的方法:Li 4 Ti 5 O 12; Li(4-α)Z&bgr; Ti5O12; 所述方法包括以下步骤:a)制备紧密分散的TiOx-LiZY-碳的三元混合物,其中x是1和2之间的数,z是1或2,Y是 选自CO 3,OH,O和TiO 3或其混合物的基团,碳是选自天然或人造石墨,炭黑,Shawinigan黑,Ketjen黑和焦炭的碳粉末; b)在400-1000℃的温度下加热分散体; 并且c)如果合适,向三元混合物中加入至少一种金属Z的源,其中选择操作条件以分别将初始产物分别转化为Li 4 Ti 5 O 12,Li(4-α)ZαTi5 O 12 ,Li4Z&bgr; Ti(5-&bgr))O12。
摘要:
The present invention relates to the physical or chemical specific purification of natural mineral graphite. This purification is preferably applied to the surface of natural graphite in order to allow the formation of a passivation film during the first electrical discharge or the insertion of lithium in the graphite when the latter is used in a lithium-ion cell. The grinding to a small size before purification allows the optimization of the distribution of the particles, resulting in a more uniform electrode. This grinding is carried out in the presence of the natural impurities of the graphite that play the role of a micro-abrasive and result in a hardness of the graphite that increases its mechanical properties.
摘要:
A method for the synthesis of compounds of the formula C—LixM1−yM′y(XO4)n, where C represents carbon cross-linked with the compound LixM1−yM′y(XO4)n, in which x, y and n are numbers such as 0≦x≦2, 0≦y≦0.6, and 1≦n≦1.5, M is a transition metal or a mixture of transition metals from the first period of the periodic table, M′ is an element with fixed valency selected among Mg2+, Ca2+, Al3+, Zn2+ or a combination of these same elements and X is chosen among S, P and Si, by bringing into equilibrium, in the required proportions, the mixture of precursors, with a gaseous atmosphere, the synthesis taking place by reaction and bringing into equilibrium, in the required proportions, the mixture of the precursors, the procedure including at least one pyrolysis step of the carbon source compound.
摘要:
The invention relates to an electrode material and a composite electrode including same. The electrode material consists of particles or particulate aggregates of a complex LiiMmM′m′ZzOoNnFf oxide, wherein M is at least one transition metal, M′ is at least one metal other than a transition metal, Z is at least one non-metal, coefficients i, m, m′, z, o, n and f are selected in such a way that the complex oxide is electrically neutral, with i=0, m>0, z=0, m′=0, o>0, n=0 and f=0. At least part of the complex oxide particle or particulate aggregate surface is coated with a carbon layer bound by chemical bonds and/or physical bonds to the carbon. The complex oxide has formula; the carbon has covalently bonded functional groups GF.
摘要:
A method for preparing a multilayer material based on active lithium, by depositing a film of active lithium on a protective layer at a sufficient speed so that substantially no oxidation of the lithium occurs, and/or during a sufficient time for the adhesion of the lithium to develop after contact with the protective layer. The multilayer material, when incorporated in an electrochemical battery as an anode, has excellent impedance stability and no formation of dendrites during the cycling. Batteries where the anode is the multilayer material are particularly efficient in terms of their coulomb efficiency.
摘要:
Synthesis process for new particles of Li4Ti5O12, Li(4-α)ZαTi5O12 or Li4ZβTi(5-β)O12, preferably having a spinel structure, wherein β is greater than 0 and less than or equal to 0.5 (preferably having a spinel structure), α representing a number greater than zero and less than or equal to 0.33, Z representing a source of at least one metal, preferably chosen from the group made up of Mg, Nb, Al, Zr, Ni, Co. These particles coated with a layer of carbon notably exhibit electrochemical properties that are particularly interesting as components of anodes and/or cathodes in electrochemical generators.
摘要翻译:Li 4 N 5 O 12的新颗粒的合成方法,Li(4-α)Z 5 u> u> sub> 5 u> u> u> β优选具有尖晶石结构,其中β大于0且小于或等于0.5(优选具有尖晶石结构),α表示大于零的数 并且小于或等于0.33,Z代表至少一种金属的源,优选选自由Mg,Nb,Al,Zr,Ni,Co组成的组。涂覆有碳层的这些颗粒特别表现出电化学性质 这在电化学发生器中作为阳极和/或阴极的组分是特别有意义的。
摘要:
The invention concerns novel ionic compounds with low melting point whereof the onium type cation having at least a heteroatom such as N, O, S or P bearing the positive charge and whereof the anion includes, wholly or partially, at least an ion imidide such as (FX1O)N−(OX2F) wherein X1 and X2 are identical or different and comprise SO or PF, and their use as solvent in electrochemical devices. Said composition comprises a salt wherein the anionic charge is delocalised, and can be used, inter alia, as electrolyte.