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 GF groups.
摘要:
The invention relates to a process for preparing an at least partially lithiated transition metal oxyanion-based lithium-ion reversible electrode material, which comprises providing a precursor of said lithium-ion reversible electrode material, heating said precursor, melting same at a temperature sufficient to produce a melt comprising an oxyanion containing liquid phase, cooling said melt under conditions to induce solidification thereof and obtain a solid electrode that is capable of reversible lithium ion deinsertion/insertion cycles for use in a lithium battery. The invention also relates to lithiated or partially lithiated oxyanion-based-lithium-ion reversible electrode materials obtained by the aforesaid process.
摘要:
The invention relates to a material C-A x M(XO 4 ) y that consists of particles of a compound of the formula A x M(XO 4 ) y , wherein said particles comprise a carbon deposit deposited by means of pyrolysis on at least a portion of the surface thereof, and where: A is Li alone or partially replaced by at most 10 atomic % of Na or K; M is Fe(II), or Μn(II), or mixtures thereof alone or partially replaced by at most 30 atomic % of one or more metals selected from Mn, Ni and Co and/or at most 5 % of Fe(III); XO 4 is PO 4 alone or partially replaced by at most 10 molar % of at least one group selected from SO 4 , Si0 4 and MoO 4 ; and where said material has a calcium impurity content of lower than about 1000 ppm.
摘要:
A particle composition comprising particles having a complex oxide core and a conductive carbon deposit on at least part of the surface of the core, wherein the particles comprise elementary nanoparticles having a nanoscale size and agglomerates or aggregates of elementary nanoparticles having a submicron to micron scale particle size; said conductive carbon deposit is a non powdery deposit, and is present on at least part of the surface of the elementary particles and on the surface of the aggregates.
摘要:
The invention relates to a method for preparing a carbonated complex oxide having a very low water content, and to the use thereof as a cathode material. The carbonated complex oxide is made of particles of an olivine-structure AMXO4 compound bearing on a portion at least of their surface a carbon film deposited by pyrolysis. A is Li alone or partially replaced with at most 10 at % of Na or K. M is FeII alone or partially replaced with at most 50 at % of one or more other metals selected from Mn, Ni and Co and/or with at most 10 at % of one or more aliovalent or isovalent metals other than Mn, Ni or Co and/or with at most 5 at % of FeIII. XO4 Is PO4 alone or partially replaced with at most 10 molar % of SO4 and SiO4. the material has a water content lower than 1000 ppm.
摘要:
Process for improving the electrochemical performance of an alkali metal oxyanion electrode material having a pyrolitic carbon deposit thereon, comprising a heat treatment under a humidified atmosphere where the heat treatment is performed at a temperature in the range of about 300°C to about 950°C.
摘要:
The invention relates to a process to induce polymerization of an organic electronically conductive polymer in the presence of a partially delithiated alkali metal phosphate which acts as the polymerization initiator.
摘要:
The invention concerns a synthesis method for a material consisting of particles comprising a core and a coating and/or being interconnected by a carbon cross-linkage, the core of said particles including at least a compound of formula LixM1-yM'y(XO4)n wherein: x, y and n are numbers such that 0≤ x ≤2, 0 ≤ y ≤0.6 and 1 ≤ n ≤1.5; M is a transition metal; M' is a element of fixed valency, and the synthesis being performed by reacting and balancing the mixture of precursors, with a reducing gas atmosphere, so as to bring the transition metal(s) to the desired degree of valency, the synthesis being carried out in the presence of a carbon source called conductive carbon which is pyrolyzed. The resulting materials exhibit excellent electrical conductivity and a highly enhanced chemical activity. M' can be selected among Mg?2+, Ca2+ Al3+, Zn2+¿ or a combination of those elements, X is selected among S, P, and Si. Said material can be used as active electrode material in batteries.