Abstract:
A non-aqueous electrolyte secondary cell is provided having superior high temperature-operation properties and excellent large current-discharge properties. The non-aqueous electrolyte secondary cell has a positive electrode composed of a positive electrode collector and positive electrode active material layers formed thereon. A positive electrode active material contained in the above layer is formed of a first composite oxide and a second composite oxide mixed therewith. The first composite oxide is formed of grains of a first lithium transition metal composite oxide containing at least nickel as a transition metal and a cover layer formed on at least part of the surface of each of the grains for suppressing decomposition of an electrolyte caused by the first lithium transition metal composite oxide. The second composite oxide is composed of grains of a second lithium transition metal composite oxide.
Abstract:
A non-aqueous electrolyte secondary cell is provided having superior high temperature-operation properties and excellent large current-discharge properties. The non-aqueous electrolyte secondary cell has a positive electrode composed of a positive electrode collector and positive electrode active material layers formed thereon. A positive electrode active material contained in the above layer is formed of a first composite oxide and a second composite oxide mixed therewith. The first composite oxide is formed of grains of a first lithium transition metal composite oxide containing at least nickel as a transition metal and a cover layer formed on at least part of the surface of each of the grains for suppressing decomposition of an electrolyte caused by the first lithium transition metal composite oxide. The second composite oxide is composed of grains of a second lithium transition metal composite oxide.
Abstract:
A cathode active material having a large capacity and improved charge/discharge cycle characteristics is disclosed. A battery has a cathode (2) having a cathode active material, an anode (3) and a non-aqueous electrolyte, and uses a cathode active material composed of a mixture of a first lithium-transition metal composite oxide containing Ni and Co and comprising a layer structure and a second lithium-transition metal composite oxide containing Ni and Mn and comprising a layer structure.
Abstract:
A positive active material including a compound expressed by a general formula LimMxM'yM"zO2 (here, M designates at least one kind of element selected from Co, Ni and Mn, M' designates at least one kind of element selected from Al, Cr, V, Fe, Cu, Zn, Sn, Ti, Mg, Sr, B, Ga, In, Si and Ge, and M" designates at least one kind of element selected from Mg, Ca, B and Ga. Further, x is designated by an expression of 0.9 ≤ x
Abstract:
Gas generation in a battery is suppressed, and high safety is realized. The battery is composed of a positive electrode in which a positive electrode active material layer including a positive electrode active material is formed on a positive electrode collector, a negative electrode in which a negative electrode active material layer including a negative electrode active material is formed on a negative electrode collector, a separator provided between the positive electrode and the negative electrode, and an electrolyte impregnated in the separator; and includes a heteropoly acid and/or heteropoly acid compound as an additive at least in one of the positive electrode, the negative electrode, the separator, and the electrolyte.
Abstract:
PROBLEM TO BE SOLVED: To provide a secondary battery which allows excellent battery characteristics to be achieved.SOLUTION: A secondary battery comprises a positive electrode including an active material, a negative electrode, and an electrolyte. The active material includes primary particles composed of active material particles, and a carbon material. The active material particles include a polyanion-based compound. The carbon material includes a first carbon material which is present on surfaces of the active material particles, and a second carbon material which is present between the active material particles with the first carbon material provided thereon. The ratio B/A of a surface carbon amount B to a total carbon amount A of the active material satisfies the condition: 7
Abstract:
PROBLEM TO BE SOLVED: To provide a negative-electrode active material for nonaqueous electrolytic secondary batteries which allows the achievement of a high level both in battery property and input property.SOLUTION: The negative-electrode active material for nonaqueous electrolytic secondary batteries comprises a complex graphite material. The complex graphite material includes a spherical graphite material having a lithium-occludable titanium-containing inorganic oxide on its surface and thereinside; the titanium-containing inorganic oxide is present in a range from the surface of the graphite material to a depth as deep as 4% or more of the average particle diameter of the graphite material when observed by means of element mapping on a cross section of the graphite material. The complex graphite material is produced by: impregnating a spheroidized natural graphite with a liquid solution containing a titanium-containing organic compound and a solvent under a negative pressure environment; then removing the solvent to prepare a precursor with the titanium-containing organic compound present on the surface of and inside the spheroidized natural graphite; and sintering the precursor. Alternatively, the complex graphite material may be produced by: impregnating a graphite material composed of a scale-like or bulk natural graphite with a liquid solution containing a titanium-containing organic compound and a solvent; then removing the solvent; spheroidizing the graphite material with the titanium-containing organic compound deposited on its surface to prepare a precursor; and sintering the precursor.
Abstract:
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery capable of stably obtaining high battery capacity even if charge/discharge is performed repeatedly by achieving both compensation of irreversible capacity during the first charge/discharge and securing of high energy density during charge/discharge after the first charge/discharge.SOLUTION: A positive electrode active material layer 21B of a positive electrode 21 contains first and second lithium composite oxides as a positive electrode active material. The second lithium composite oxide is represented by Li(MnCoNi)O(a is 0
Abstract translation:要解决的问题:为了提供一种能够稳定地获得高电池容量的锂离子二次电池,即使通过在第一次充电/放电期间实现不可逆容量的补偿并且确保高能量密度期间重复执行充电/放电 第一次充电/放电后的充放电。 解决方案:正极21的正极活性物质层21B含有作为正极活性物质的第一和第二锂复合氧化物。 第二锂复合氧化物由Li 1 + a SB>(Mn b SB> Co Ni 1-bc SB>) 1-a SB> O 2 SB> a为0
Abstract:
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery endowed with both high battery capacity and charge and discharge cycle characteristics. SOLUTION: The nonaqueous electrolyte battery is produced by using a positive electrode active material wherein at least one kind of a metal element M1 different from a primary transition metal element A exists on at least a part of the surface of lithium-containing transition metal oxide including the primary transition metal element A and a compound of a metal element M2 different from the metal element M1 is adhered to at least a part of the surface of lithium-containing transition metal oxide including the primary transition metal element A or a compound of the metal element M2 different from the metal element M1 exists in the vicinity of the lithium-containing transition metal oxide. It is preferable that a whole composition of the positive electrode active material has a relationship of 0.001 COPYRIGHT: (C)2011,JPO&INPIT