Abstract: The invention relates to a lithium battery including a cell comprising: a positive electrode, a negative electrode, and an electrolyte consisting of an aqueous solution of a lithium salt, characterized in that the electrolyte has a pH of at least 14, the positive electrode has a lithium intercalation potential greater than 3.4 V, and the negative electrode has a lithium intercalation potential less than 2.2 V.

Abstract: The present invention relates to a crucible that can be used for solidifying a silicon ingot from molten silicon, characterized in that same is at least partially coated on the inner surface thereof with at least one layer consisting of a material produced by thermal decomposition of polysilizane(s), said layer having a shear strength greater than 1 Pa and no higher than 500 MPa, and being in the form of a stack of adjoining layers of non-contiguous tiles. The invention also relates to a method for preparing such crucibles.

Abstract: A material or compound is provided having a spinel structure and corresponding to the formula LiyNi0.5Mn1.5?xIVMnxIIIAzO4?d, where: 0.02?x?0.35; d>0; A is selected from the group comprising Na, K, Mg, Nb, Al, Ni, Co, Zr, Cr, Fe, Cu, Ti, Zn, Si and Mo; 0.8?y?1.2; 0?z?0.1; and has a mesh parameter of between 8.174 and 8.179 ?.

Abstract: A material or compound is provided having a spinel structure and corresponding to the formula LiyNi0.5Mn1.5?xIVMnxIIIAzO4?d, where: 0.02?x?0.35; d>0; A is selected from the group comprising Na, K, Mg, Nb, Al, Ni, Co, Zr, Cr, Fe, Cu, Ti, Zn, Si and Mo; 0.8?y?1.2; 0?z?0.1; and has a mesh parameter of between 8.174 and 8.179 ?.

Abstract: A lithium battery comprises at least a positive electrode containing a material whose lithium insertion and deinsertion potential is lower than or equal to 3.5 Volts in relation to the potential of the Li+/Li couple, a negative electrode and a non-aqueous electrolyte disposed between the positive and negative electrodes. The electrolyte comprises at least a lithium salt dissolved in an aprotic organic solvent wherein a polymerizable additive is added, chosen from carbazol and the derivatives thereof and being used to prevent the battery from operating as soon as the voltage at the terminal connections of the battery reaches a value resulting in polymerization of the additive.

Abstract: The present invention relates to a process for preparing composite materials comprising an electrode active compound of formula AaDdMmZzOoNnFf, such as an alkali metal ion, such as a lithium ion, insertion compound, and an electronically conducting compound, such as carbon, in which a homogeneous mixed precursor containing all the elements A, D, M, Z, O, N and F forming the electrode active compound and also one or more organic and/or organometallic compounds are thermally decomposed, in a short period of time, so as to obtain the composite material. These composite materials in particular find their application in devices containing said compounds and/or active materials, such as electrochemical devices and batteries, in particular lithium batteries.

Abstract: A powdery compound selected from the group consisting of Li4Ti5O12 and its derivatives selected from the group consisting of Li4?xMxTi5O12 and Li4Ti5?yNyO12 (x and y between 0 and 0.2, M and N selected from the group consisting of Na, K, Mg, Nb, Al, Ni , Co, Zr, Cr, Mn, Fe, Cu, Zn, Si and Mo), used as active material of an electrode for a lithium storage battery, consists of unitary particles having a diameter not greater than 1 ?m and 10-50% volume agglomerated particles having a diameter not greater than 100 ?m wherein the agglomerated particles formed by agglomeration of said unitary particles. The method for producing such a compound preferably consists in grinding the synthesized oxide for a duration comprised between 24 hours and 48 hours in a planetary mill and in then performing thermal treatment at a temperature comprised between 450° C. and 600° C.

Abstract: A separator for a battery in lithium. The separator is a thick membrane, of around 60 to 120 ?m in polyvinylidene fluoride copolymer, which has considerable porosity, of around 50 to 90%, with pores of size between 1 and 10 ?m. With these characteristics, it is possible to optimize the operation of a battery with an electrode in, e.g., Li4Ti5O12, in particular for rapid charges and discharges, in other words in power applications.

Abstract: A material or compound is provided having a spinel structure and corresponding to the formula LiyNi0.5Mn1.5-xIVMnxIIIAzO4-d, where: 0.02?x?0.35; d>0; A is selected from the group comprising Na, K, Mg, Nb, Al, Ni, Co, Zr, Cr, Fe, Cu, Ti, Zn, Si and Mo; 0.8?y?1.2; 0?z?0.1; and has a mesh parameter of between 8.174 and 8.179 ?.

Abstract: The invention relates to a lithium battery including a cell comprising: a positive electrode, a negative electrode, and an electrolyte consisting of an aqueous solution of a lithium salt, characterized in that the electrolyte has a pH of at least 14, the positive electrode has a lithium intercalation potential greater than 3.4 V, and the negative electrode has a lithium intercalation potential less than 2.2 V.

Abstract: A powdery compound of mixed titanium lithium oxide, preferably used as active material of an electrode for a lithium storage battery, consists of particles having a diameter smaller than or equal to 1 ?m and of at least 10% by volume of grains having a diameter smaller than or equal to 100 ?m. It is formed by agglomeration of said particles. The method for producing such a compound preferably consists in grinding the synthesized oxide for a duration comprised between 24 hours and 48 hours in a planetary mill and in then performing thermal treatment at a temperature comprised between 450° C. and 600° C.

Abstract: A lithium battery comprises at least a positive electrode containing a material whose lithium insertion and deinsertion potential is lower than or equal to 3.5 Volts in relation to the potential of the Li+/Li couple, a negative electrode and a non-aqueous electrolyte disposed between the positive and negative electrodes. The electrolyte comprises at least a lithium salt dissolved in an aprotic organic solvent wherein a polymerizable additive is added, chosen from carbazol and the derivatives thereof and being used to prevent the battery from operating as soon as the voltage at the terminal connections of the battery reaches a value resulting in polymerization of the additive.

Abstract: A separator for a battery in lithium. The separator is a thick membrane, of around 60 to 120 ?m in polyvinylidene fluoride copolymer, which has considerable porosity, of around 50 to 90%, with pores of size between 1 and 10 ?m. With these characteristics, it is possible to optimize the operation of a battery with an electrode in, e.g., Li4Ti5O12, in particular for rapid charges and discharges, in other words in power applications.

Abstract: The present invention relates to a process for preparing composite materials comprising an electrode active compound of formula AaDdMmZzOoNnFf, such as an alkali metal ion, such as a lithium ion, insertion compound, and an electronically conducting compound, such as carbon, in which a homogeneous mixed precursor containing all the elements A, D, M, Z, O, N and F forming the electrode active compound and also one or more organic and/or organometallic compounds are thermally decomposed, in a short period of time, so as to obtain the composite material. These composite materials in particular find their application in devices containing said compounds and/or active materials, such as electrochemical devices and batteries, in particular lithium batteries.