摘要:
Provided is a novel lithium silicate-based material useful as a positive electrode material for lithium ion secondary battery.The lithium silicate-based compound is represented by Li1.5FeSiO4.25. The lithium silicate-based compound is a compound including: lithium (Li); iron (Fe); silicon (Si); and oxygen (O), and expressed by a composition formula, Li1+2δFeSiO4+δ−c (−0.25≦δ≦0.25, 0≦c≦0.5). The lithium silicate-based compound, of which iron (Fe) is trivalent, exerts a remarkable chemical stability as compared to Li2FeSiO4.
摘要:
Provided is a novel lithium silicate-based material useful as a positive electrode material for lithium ion secondary battery.The lithium silicate-based compound is represented by Li1.5FeSiO4.25 The lithium silicate-based compound is a compound including: lithium (Li); iron (Fe); silicon (Si); and oxygen (O), and expressed by a composition formula, Li1+2δFeSiO4+δ−c(−0.25≦δ≦0.25, 0≦c≦0.5). The lithium silicate-based compound, of which iron (Fe) is trivalent, exerts a remarkable chemical stability as compared to Li2FeSiO4.
摘要:
A production process for lithium-silicate-based compound is characterized in that: a lithium-silicate compound is reacted with a transition-metal-element-containing substance including iron and/or manganese at from 300° C. or more to 600° C. or less within a molten salt including at least one member being selected from the group consisting of alkali-metal salts under a mixed-gas atmosphere including carbon dioxide and a reducing gas; wherein said transition-metal-element-containing substance includes a deposit that is formed by alkalifying a transition-metal-containing aqueous solution including a compound that includes iron and/or manganese. In accordance with the present production process, lithium-silicate-based compounds including silicon excessively are obtainable. In accordance with the present invention, it is possible to produce materials, which have better battery characteristics than do conventional ones, by means of relatively easy means, regarding lithium-silicate-based materials that are useful as a positive-electrode material for secondary battery.
摘要:
The present invention provides a process for producing a lithium sulfide-carbon composite, the process comprising placing a mixture of lithium sulfide and a carbon material having a specific surface area of 60 m2/g or more in an electrically-conductive mold in a non-oxidizing atmosphere, and applying a pulsed direct current to the mold while pressurizing the mixture in a non-oxidizing atmosphere, thereby subjecting the lithium sulfide and the carbon material to heating reaction; and a lithium sulfide-carbon composite obtained by this process, the composite having a carbon content of 15 to 70 weight %, and a tap density of 0.4 g/cm3 or more when the carbon content is 30 weight % or more, or a tap density of 0.5 g/cm3 or more when the carbon content is less than 30 weight %. The present invention can improve the electronic conductivity of lithium sulfide, which is expected to be put into practical use as a high-capacity positive electrode active material, so as to further enhance the performance of lithium sulfide as a positive electrode active material for lithium ion secondary batteries.
摘要翻译:本发明提供一种硫化锂 - 碳复合材料的制造方法,其特征在于,在非导电性模具中将硫化锂和比表面积为60m 2 / g以上的碳材料的混合物, 氧化气氛,并且在非氧化性气氛中对混合物加压的同时向模具施加脉冲直流电流,从而使硫化锂和碳材料进行加热反应; 和通过该方法获得的硫化锂 - 碳复合材料,当碳含量为30重量%以上时,复合材料的碳含量为15〜70重量%,振实密度为0.4g / cm 3以上, 当碳含量小于30重量%时,密度为0.5g / cm 3以上。 本发明可以提高预期作为大容量正极活性物质实际使用的硫化锂的电子导电性,从而进一步提高作为锂离子的正极活性物质的硫化锂的性能 二次电池
摘要:
The present invention provides a process for producing a lithium sulfide-carbon composite, the process comprising placing a mixture of lithium sulfide and a carbon material having a specific surface area of 60 m2/g or more in an electrically-conductive mold in a non-oxidizing atmosphere, and applying a pulsed direct current to the mold while pressurizing the mixture in a non-oxidizing atmosphere, thereby subjecting the lithium sulfide and the carbon material to heating reaction; and a lithium sulfide-carbon composite obtained by this process, the composite having a carbon content of 15 to 70 weight %, and a tap density of 0.4 g/cm3 or more when the carbon content is 30 weight % or more, or a tap density of 0.5 g/cm3 or more when the carbon content is less than 30 weight %. The present invention can improve the electronic conductivity of lithium sulfide, which is expected to be put into practical use as a high-capacity positive electrode active material, so as to further enhance the performance of lithium sulfide as a positive electrode active material for lithium ion secondary batteries.
摘要翻译:本发明提供一种硫化锂 - 碳复合材料的制造方法,其特征在于,在非导电性模具中将硫化锂和比表面积为60m 2 / g以上的碳材料的混合物, 氧化气氛,并且在非氧化性气氛中对混合物加压的同时向模具施加脉冲直流电流,从而使硫化锂和碳材料进行加热反应; 和通过该方法获得的硫化锂 - 碳复合材料,当碳含量为30重量%以上时,复合材料的碳含量为15〜70重量%,振实密度为0.4g / cm 3以上, 当碳含量小于30重量%时,密度为0.5g / cm 3以上。 本发明可以提高预期作为大容量正极活性物质实际使用的硫化锂的电子导电性,从而进一步提高作为锂离子的正极活性物质的硫化锂的性能 二次电池
摘要:
The present invention provides a lithium manganese-based composite oxide represented by the compositional formula: Li1+x(Mnl-m-nFemTin)1-xO2, wherein 0
摘要翻译:本发明提供一种由以下组成式表示的锂锰基复合氧化物:Li 1 + x N(Mn 1 N m Fe 2 Ti Ti 其中0 sub> 0.75和0.01 <= m + n <1,并且包含层状岩盐型结构的结晶相。 复合氧化物能够在长的充电/放电循环中保持3V以上的平均放电电压。 复合氧化物可以使用较低成本的起始材料制备,并且与常规低成本正极材料相比表现出改善的充电/放电特性。
摘要:
A method of determining the charge and/or discharge capacities of non-aqueous batteries with an operating voltage of about 4 volts, is provided including determining an inverse molar susceptibility value at each of a plurality of different temperatures for a plurality of lithium manganese spinel oxide cathode materials having different respective Mn valencies; plotting the inverse molar susceptibility values against temperatures for each of the plurality of lithium manganese spinel oxide cathode materials; determining values of at least one of two paramagnetic parameters, Weiss temperature and effective magnetic moment, by obtaining the temperature dependence of the above inverse molar susceptibility from a plot derived from the Curie-Weiss law, the Weiss temperature corresponding to a temperature value extrapolated to a zero point of the inverse molar susceptibility and the effective magnetic moment being obtainable from the gradient value of the plot; producing plural rechargeable lithium batteries in which lithium manganese spinel oxides with well-defined Mn valencies are used as cathode materials, and finding at least one of the charge or discharge capacities around 4V for each of the batteries; providing at least one correlation curve between the above-found charge and/or discharge capacities and the above-found at least one paramagnetic parameter value; and obtaining charge and/or discharge capacities for a rechargeable lithium battery containing a lithium manganese spinel oxide whose charge and/or discharge capacities are being sought from the at lest one determined paramagnetic parameter value using the at least one correlation curve. A method of determining the charge and/or discharge capacities of non-aqueous batteries with an operating voltage of about 4 volts, is also provided which includes determining a spontaneous magnetization value for each of a plurality of lithium manganese spinel oxide cathode materials having a different respective Mn valency by determining a magnetization value of each of a plurality of magnetic fields at a constant temperature to obtain and thereafter use a correlation curve.
摘要:
The invention provides a lithium-manganese-based composite oxide containing Ti and Ni, which is represented by the compositional formula: Li1+x(Mn1−n−mNimTin)1−xO2, wherein 0
摘要:
A lithium cobalt oxide (LiCoO2) having a layered rock-salt type structure produced at low temperatures by hydrothermally treating at least one water-soluble cobalt salt in an aqueous solution containing a water-soluble lithium salt and an alkali metal hydroxide at 105 to 300° C. in the presence of an oxidizing agent. An inexpensive salt of divalent cobalt is used as a starting material in this process. The lithium cobalt oxide thus obtained is useful as a cathode material for rechargeable lithium batteries.
摘要:
The present invention provides a lithium manganese-based composite oxide represented by the compositional formula: Li1+x(Mn1-m-nFemTin)1−xO2, wherein 0