摘要:
An electrochemical generator comprising thin films including a positive electrode and its collector, and a sheet of a host metal intended to later on constitute a negative electrode, as well as an electrolyte which is conductive towards alkaline ions and also a source of alkali ions. The sheet of the host metal has voids whose quantity and arrangement are capable of locally absorbing any lateral expansion of the sheet of host metal and thereby substantially preventing all cumulative change in the plane of the sheet of host metal when there is an initial formation of alloy in the sheet between the host metal and an alkali metal which is brought about by the alkaline ions. A method of manufacturing such a generator is also described.
摘要:
The invention concerns an aprotic electrolytic composition located in the separator and in at least one composite electrode containing a powder of an active electrode material, and if necessary an electronic conduction additive of an electrochemical generator. The electrolytic composition comprises a first polymer matrix consisting of a polyether and at least a second polymer matrix, macroscopically separated, and also at least an alkaline salt as well as a polar aprotic solvent: The polymer matrices are capable of being swollen by at least one of the polar aprotic solvents. The solvent or mixture of solvents is unevenly distributed between the polymer matrices. The invention also concerns an electrochemical generator comprising a negative electrode and positive electrode reversible to alkaline ions and a separator with polymer electrolyte, the electrolytic component of which is the composition described above. The invention further concerns the manufacture in two or three steps of a sub-assembly of an electrochemical generator by coating an electrode support with a composite electrode containing the second matrix, followed by a surface coating on the electrode resulting from the preceding step with a solution containing the first polymer matrix so as to form the separator wholly or partly.
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), a 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(S-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),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 an aprotic electrolytic composition located in the separator and in at least one composite electrode containing a powder of an active electrode material, and if necessary an electronic conduction additive of an electrochemical generator The electrolytic composition comprises a first polymer matrix consisting of a polyether and at least a second polymer matrix, macroscopically separated, and also at least an alkaline salt as well as a polar aprotic solvent: The polymer matrices are capable of being swollen by at least one of the polar aprotic solvents. The solvent or mixture of solvents is unevenly distributed between the polymer matrices. The invention also concerns an electrochemical generator comprising a negative electrode and positive electrode reversible to alkaline ions and a separator with polymer electrolyte, the electrolytic component of which is the composition described above. The invention further concerns the manufacture in two or three steps of a sub-assembly of an electrochemical generator by coating an electrode support with a composite electrode containing the second matrix, followed by a surface coating on the electrode resulting from the preceding step with a solution containing the first polymer matrix so as to form the separator wholly or partly.
摘要:
Synthesis process for new particles of Li4Ti5O12, Li(4-α)ZαTi5O12 or Li4ZβTi(5-β)O12, wherein β is >0 and ≦0.5, α is a number >0 and ≦0.33, Z is 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. The process may involve the steps of a) preparing a dispersion of a mixture of TiOx—LizY-carbon, wherein x is a number between 1 and 2, z is 1 or 2, and Y is a radical chosen among CO3, OH, O and TiO3 or a mixture thereof; and 2) heating of the dispersion, preferably to a temperature of between about 400° C. and about 1000° C.
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 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:
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:
Process for the purification of an ionic electrolyte comprising at least one alkali metal salt, the process having at least one stage in which particles of at least one calcium salt are brought into contact. The process makes it possible to obtain electrolytes characterized in particular by a particularly low water content. The corresponding electrochemical generators which incorporate the electrolyte as constituent component are characterized by a noteworthy stability and are particularly safe.