摘要:
A novel supported bimetallic catalyst comprises a group VIII metal such as platinum, and tin, at least a portion of which interacts strongly with the group VIII metal in the catalyst in the reduced state. In the partially oxidized state, the catalyst of the invention contains at least 10% of tin in the form of a reduced tin species with oxidation state 0, said species having an isomer shift in the range 0.80 to 2.60 mm/s and a quadrupolar splitting in the range 0.65 to 2.00 mm/s. The invention also concerns the preparation of said catalyst, and processes using said catalyst for transforming hydrocarbons into aromatic compounds, such as gasoline reforming processes and aromatic production processes.
摘要:
A process for dehydrogenating organic compounds, in particular paraffins and naphthenes, is carried out in the presence of a supported catalyst comprising a group VIII metal such as platinum, and tin, at least a portion of which interacts strongly with the group VIII metal in the catalyst in the reduced state. In the partially oxidised state, the catalyst contains at least 10% of tin in the form of a reduced tin species with oxidation state 0, said species having an isomer shift in the range 0.80 to 2.60 mm/s and a quadrupolar splitting in the range 0.65 to 2.00 mm/s.
摘要:
The invention relates to active material for the negative electrode of secondary rechargeable lithium batteries, wherein the active material is based on doped or undoped carbon-bearing lithium titanium ramsdellite oxide with general formula Li2Ti3O7 or Li2.28Ti3.43O8. The active material comprises a carbon substituted ramsdellite phase having a general formula Li2−4cCc—Ti3O7, with 0.1
摘要翻译:本发明涉及二次可再充电锂电池负极的活性材料,其中活性材料是基于通式Li 2 Ti 3 O 7或Li2.28Ti3.43O8的掺杂或未掺杂的含碳的钛钛硫酸氧化物。 活性材料包括具有通式Li2-4cCc-Ti3O7,0.1
摘要:
The invention relates to active material for the negative electrode of secondary rechargeable lithium batteries, wherein the active material is based on doped or undoped carbon-bearing lithium titanium ramsdellite oxide with general formula Li2Ti3O7 or Li2.28Ti3.43O8. The active material comprises a carbon substituted ramsdellite phase having a general formula Li2−4cCc—Ti3O7, with 0.1
摘要翻译:本发明涉及二次可再充电锂电池负极的活性材料,其中活性材料是基于通式Li 2 Ti 3 O 7或Li2.28Ti3.43O8的掺杂或未掺杂的含碳的钛钛硫酸氧化物。 活性材料包括具有通式Li2-4cCc-Ti3O7,0.1
摘要:
The invention concerns a catalyst comprising at least one metal M from group VIII, tin, a phosphorus promoter, a halogenated compound, a porous support and at least one promoter X1 selected from the group constituted by gallium, indium, thallium, arsenic, antimony and bismuth. In 119Sn Mössbauer spectroscopy, the catalyst in the reduced form has a signal with a quadripole splitting value in the range 0 to 0.45 mm/s and an isomer shift, IS, in the range 1.5 to 2.4 mm/s with respect to CaSnO3, said signal representing in the range 1% to 30% of the total area of the signals.
摘要:
An active material for high-voltage negative electrodes (>1 V vs. Li) of secondary rechargeable lithium batteries is disclosed. Chemical composition is represented by the general formula Li2+vTi3−WFeXMyM′ZO7−α, where M and M′ are metal ions having an ionic radius between 0.5 and 0.8 A and forming an octahedral structure with oxygen, like Ti3+, Co2+, Co3+, Ni2+, Ni3+, Cu2+, Mg2+, Al3+, In3+, Sn4+, Sb3+, Sb5+, α is related to the formal oxidation numbers n and n′ of M and M′ by the relation 2α=v+4w −3x−ny−n′z and the ranges of values are −0.5≦V≦0.5, 0≦w≦0.2, x>0, y+z>0 and x+y+z≦0.7. The structure is related to that of ramsdellite for all the compositions. The negative active material is prepared by ceramics process wherein lithium oxide, titanium oxide, iron oxide, M and/or M′ oxide are used as starting material for synthesis. Inorganic or organic solid precursors of the oxides can also be used instead. After reactant dispersion the mixture is fired. The resulting electrochemically active material provides low working voltage and capacity with excellent cycling capabilities at both low and high current densities.
摘要翻译:公开了二次可再充电锂电池的高电压负极(> 1V对Li)的活性材料。 化学成分由通式Li 2 + v 3 Ti 3 -W 3 Fe x M M'表示, 其中M和M'是离子半径在0.5和0.8A之间的金属离子,并且与氧形成八面体结构,如Ti 3+,3+,3+,3+,3+,3+,3+,3+,3+,3++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ,Cu 2+,Mg 2+,N 3+,3+,Sn 4+, Sb 3+,Sb 5+,α与M和M'的形式氧化数n和n'有关,其关系为2alpha = v + 4w -3x-ny-n'z,值的范围为-0.5 <= V <= 0.5,0 <= w <= 0.2,x> 0,y + z> 0,x + y + z < 0.7。 该结构与所有组合物的ramsdellite相关。 负极活性物质通过陶瓷工艺制备,其中使用氧化锂,氧化钛,氧化铁,M和/或M'氧化物作为合成起始材料。 也可以使用氧化物的无机或有机固体前体。 反应物分散后,将混合物烧制。 所得到的电化学活性材料在低电流密度和高电流密度下提供低工作电压和容量以及优异的循环能力。
摘要:
A negative electrode material, a method for producing this material, and to a negative electrode and a lithium-ion battery comprising this material are described. The material comprises an active phase consisting of a material M based on Al, Si, Sn, Sb or a mixture thereof, and a support phase consisting of a material XaYbOc, where: O is an oxygen; Y is a cation with oxidation degree m=3, 4, 5 or 6; X is a cation with oxidation degree d=1, 2, 3, 4 or 5, X ensuring the electroneutrality of XaYbOc; and where: c is such that 2≦c≦10; b is such that 1≦b≦4; and a=(2c−bm)/d. An interface of mixed composition exists between the XaYbOc material and the active phase M, the interface consisting of the elements M, X, Y and O.
摘要:
An active material for high-voltage negative electrodes (>1V vs. Li) of secondary rechargeable lithium batteries is disclosed. Chemical composition is represented by the general formula Li2+vTi3−WFeXMyM′ZO7−α, where M and M′ are metal ions having an ionic radius between 0.5 and 0.8 A and forming an octahedral structure with oxygen, like Ti3+, Co2+, Co3+, Ni2+, Ni3+, Cu2+, Mg2+, Al3+, In3+, Sn4+, Sb3+, Sb5+, α is related to the formal oxidation numbers n and n′ of M and M′ by the relation 2α=v+4w−3x−ny−n′z and the ranges of values are −0.5≦V≦0.5, 0≦w≦0.2, x>0, y+z>0 and x+y+z≦0.7. The structure is related to that of ramsdellite for all the compositions. The negative active material is prepared by ceramics process wherein lithium oxide, titanium oxide, iron oxide, M and/or M′ oxide are used as starting material for synthesis. Inorganic or organic solid precursors of the oxides can also be used instead. After reactant dispersion the mixture is fired. The resulting electrochemically active material provides low working voltage and capacity with excellent cycling capabilities at both low and high current densities.
摘要:
This invention relates to a negative electrode material, a method for producing this material, and to a negative electrode and a lithium-ion battery comprising this material. The material of the invention comprises an active phase consisting of a material M based on Al, Si, Sn, Sb or a mixture thereof, and a support phase consisting of a material XaYbOc, where: O is an oxygen; Y is a cation with oxidation degree m=3, 4, 5 or 6; X is a cation with oxidation degree d=1, 2, 3, 4 or 5, X ensuring the electroneutrality of XaYbOc; and where: c is such that 2≦c≦10; b is such that 1≦b≦4; and a=(2c−bm)/d. An interface of mixed composition exists between the XaYbOc material and the active phase M, the said interface consisting of the elements M, X, Y and O. XaYbOc may be for example BPO4. The production method comprises a first heat treatment of a mixture of oxides of X and Y to obtain a material XYO4; a cooling followed by a grinding of the material obtained; a mixing of the ground material with M; a second heat treatment of the mixture obtained to obtain the said material of the invention; and a cooling of the said material.
摘要翻译:本发明涉及一种负极材料,该材料的制造方法以及负极和包含该材料的锂离子电池。 本发明的材料包括由基于Al,Si,Sn,Sb或其混合物的材料M组成的活性相和由材料X a a B b组成的载体相 其中:O是氧; Y是氧化度m = 3,4,5或6的阳离子; X是具有氧化度d = 1,2,3,4或5的阳离子,X确保X sub> B sub> C sub>的电中性 >; 并且其中:c为2 <= c <= 10; b是1 <= B <= 4; 和A =(2C-bm)/ d。 混合组合物的界面存在于材料与活性相M之间,所述界面由元素M ,X,Y和O.可以是例如BPO 4 O。 制备方法包括对X和Y的氧化物的混合物进行第一次热处理以获得XYO 4的材料; 冷却,然后研磨所得材料; 研磨材料与M的混合; 获得的混合物的第二次热处理以获得本发明的所述材料; 和所述材料的冷却。
摘要:
An active material for a lithium battery electrode comprises a phase having the formula Li2+v−4cCcTi3−wFexMyM′zO7−α, in which M and M′ are metal ions of groups of 2 to 15 having an ionic radius between 0.5 and 0.8 Å in an octahedral environment, v, w, x, y, z and α being associated by the relationships: 2α=−v+4w−3x−ny−n′z, with n and n′ being the respective formal degrees of oxidation of M and M′; −0.5≦v≦0.5; y+z>0; x+y+z=w; and 0
摘要翻译:用于锂电池电极的活性材料包括具有式Li2 + v-4cCcTi3-wFexMyM'zO7-α的相,其中M和M'是离子半径在0.5和0.8之间的2至15的基团的金属离子 在八面体环境中,v,w,x,y,z和α通过以下关系相关联:2alpha = -v + 4w-3x-ny-n'z,其中n和n'分别是相应的正式氧化度 M和M'; -0.5 @ v @ 0.5; y + z> 0; x + y + z = w; 和0