Abstract:
In a nonaqueous electrolyte secondary battery including a positive electrode (11) whose surface has a positive electrode mixture layer containing a mixture of a conductive carbon material and a positive electrode active material containing a lithium-containing transition metal composite oxide having a layer structure and represented by the general formula LiaNixM(1-x)O2 (where M represents one or more kinds of elements, and a and x satisfy the conditions 0
Abstract:
A positive electrode active material of a nonaqueous electrolyte secondary battery is improved by using an inexpensive lithium transition metal oxide containing nickel and manganese as main components. Output characteristics of the battery under various temperature conditions are thereby improved, and the battery is suitable as a power supply of a hybrid vehicle. The battery includes a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, and a nonaqueous electrolyte prepared by dissolving a solute in a nonaqueous solvent. The positive electrode active material includes positive electrode active material particles composed of a lithium transition metal complex oxide having a layered structure containing nickel and manganese as main components, and at least one niobium-containing material selected from a Li—Nb—O compound and a Li—Ni—Nb—O compound, the at least one niobium-containing material being sintered onto surfaces of the positive electrode active material particles.
Abstract:
A method for producing with a high yield a high performance non-aqueous electrolyte secondary cell with a reduced cost is provided. The method includes the steps of: a baking step of baking a positive electrode active material precursor containing a lithium source and a nickel source in order to render the positive electrode active material precursor a lithium nickel composite oxide; a measuring step of measuring the amount of carbon dioxide gas occurring when the lithium nickel composite oxide is heated to 200° C. or higher and 1500° C. or lower in an inactive gas atmosphere; a selecting step of selecting a lithium nickel composite oxide satisfying the following formulas: y
Abstract:
A nonaqueous electrolyte secondary battery comprising a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte is characterized in that the positive electrode active material is composed of a lithium trasition metal oxide having a layer structure and containing Li and Co and further contains a group IVA element and group IIA element of the periodic table.
Abstract:
A method for producing a non-aqueous electrolyte secondary cell by preparing a positive electrode by applying a positive electrode mixture onto a positive electrode core material, the mixture containing a positive electrode active material mainly made of a lithium nickel composite oxide and a binding agent containing polyvinylidene fluoride; measuring the amount of carbon dioxide gas generated when a layer of the positive electrode mixture is removed out of the positive electrode and the layer is heated to 200° C. or higher and 400° C. or lower in an inactive gas atmosphere; selecting a positive electrode satisfying the following formulas: y
Abstract translation:一种通过在正极芯材上涂布正极合剂制备正极来制造非水电解质二次电池的方法,该混合物含有主要由锂镍复合氧化物制成的正极活性物质和含有 聚偏氟乙烯; 测量当正极混合物层从正极中除去并且在惰性气体气氛中将层加热至200℃以上且400℃以下时产生的二氧化碳气体的量; 选择满足以下公式的正极:y <(0.27x-51)/ 1000000(200&nlE; x <400)式1 y <57/1000000(400&nlE; x&nlE; 1500)式2其中x是加热温度 C.),y是测量每1g镍镍复合氧化物的二氧化碳气体量(摩尔/ g); 并通过使用所选择的正极制备非水电解质二次电池。
Abstract:
A nonaqueous electrolyte secondary battery in which a lithium transition metal complex oxide containing at least Ni and Mn as transition metals and having a layered structure is used as a positive active material, the lithium transition metal complex oxide containing at least Ni and Mn as transition metals and having a layered structure further containing zirconium.
Abstract:
A positive electrode active material quality judgment method that can easily and accurately judge the quality of a positive electrode active material used in a non-aqueous electrolyte secondary cell without having to complete the positive electrode. The positive electrode active material quality judgment method includes: heating a positive electrode active material mainly made of a lithium nickel composite oxide to a temperature x (° C.) of 200° C. or higher and 1500° C. or lower; measuring the amount of carbon dioxide gas occurring from the heating; and the positive electrode active material as a suitable positive electrode active material when the positive electrode active material satisfies formulas 1 and 2: y
Abstract translation:一种正极活性物质评价方法,其能够容易且准确地判断在非水电解质二次电池中使用的正极活性物质的质量,而无需完成正极。 正极活性物质判定方法包括:将主要由锂镍复合氧化物形成的正极活性物质加热至200℃以上且1500℃以下的温度x(℃) 测量从加热发生的二氧化碳气体的量; 正极活性物质为正极活性物质时,正极活性物质满足式1和2:y <(0.27x-51)/ 1000000(200&nlE; x <400)式1 y <57/1000000( 400&nlE; x&nlE; 1500)式2其中x是加热温度x(℃),y是在加热到加热时每1g正极活性物质发生的二氧化碳气体量(摩尔/克) 温度x(℃)。
Abstract:
A positive electrode active material quality judgment method that can easily and accurately judge the quality of a positive electrode active material used in a non-aqueous electrolyte secondary cell without having to complete the positive electrode. The positive electrode active material quality judgment method includes: heating a positive electrode active material mainly made of a lithium nickel composite oxide to a temperature x (° C.) of 200° C. or higher and 400° C. or lower; measuring the amount of carbon dioxide gas generated from the heating; and the positive electrode active material as a suitable positive electrode active material when the positive electrode active material satisfies formulas 3 and 4: y
Abstract translation:一种正极活性物质评价方法,其能够容易且准确地判断在非水电解质二次电池中使用的正极活性物质的质量,而无需完成正极。 正极活性物质判定方法包括:将主要由锂镍复合氧化物形成的正极活性物质加热至200℃以上且400℃以下的温度x(℃) 测量从加热产生的二氧化碳气体的量; 和正极活性物质当正极活性物质满足式3和4时,正极活性物质为:y <(1.31×258)/ 1000000(200&nlE; x <300)式3 y <1.20×225 公式4其中x是加热温度x(℃),y是每1g 1g正极活性物质在加热时产生的二氧化碳气体量(摩尔/克)(g / g) 加热温度x(℃)。
Abstract:
The storage characteristics in a charged state are improved in a non-aqueous electrolyte secondary battery containing a lithium cobalt oxide as a positive electrode active material. The non-aqueous electrolyte secondary battery includes a positive electrode containing a positive electrode active material; a negative electrode containing a negative electrode active material other than metallic lithium; and a non-aqueous electrolyte. The positive electrode active material contains a lithium cobalt oxide as its main component. The non-aqueous electrolyte contains 0.1 to 10 volume % of a compound having an ether group. The positive electrode active material and the negative electrode active material are contained so that the charge capacity ratio of the negative electrode to the positive electrode is from 1.0 to 1.2 when the battery is charged until the potential of the positive electrode reaches 4.4 to 4.5 V (vs. Li/Li+).
Abstract:
A nonaqueous electrolyte secondary battery including a negative electrode containing a graphite material as the negative active material, a positive electrode containing lithium cobalt oxide as a main component of the positive active material and a nonaqueous electrolyte solution, the battery being characterized in that the lithium cobalt oxide contains a group IVA element selected from the group consisting of Ti, Zr and Hf and a group IIA element of the periodic table, the nonaqueous electrolyte solution contains 0.2-1.5% by weight of a sulfonyl-containing compound and preferably further contains 0.5-4% by weight of vinylene carbonate.