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Positive electrode active material and nonaqueous electrolyte secondary cell

A positive electrode active material, non-aqueous electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, active material electrodes, etc.

Inactive Publication Date: 2003-03-26
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] An object of the present invention is to solve the problems of conventional positive electrode active materials and provide a positive electrode active material for a cathode and a nonaqueous electrolyte secondary battery capable of achieving excellent electrode performance and nonaqueous electrolyte secondary battery performance, which There is no need to include an additional material that does not contribute to charge and discharge reactions and wherein excellent charge and discharge cycle performance and storage performance with a large capacity can coexist with suppression of battery temperature rise when overcharged

Method used

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  • Positive electrode active material and nonaqueous electrolyte secondary cell
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Experimental program
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Embodiment 1

[0060] The embodiments of the present invention will now be described based on specific experimental results. However, it can be understood that the present invention is not limited to the embodiments.

[0061] [Experiment 1-1]

[0062] First check Li m Co x Al y Mg z O 2 The numerical range of y and z in.

[0063] Sample 1

[0064] First, the positive electrode active material was produced as follows. Commercially available lithium carbonate, cobalt oxide, aluminum hydroxide and magnesium carbonate were mixed together in a molar ratio of Li, Co, Al and Mg of 1.02:0.98:0.01:0.01. The resulting mixture was sintered in a stream of dry air using a crucible made of alumina. When the obtained powder was quantitatively analyzed by atomic absorption analysis method, it was confirmed that LiCo 0.98 Al 0.01 Mg 0.01 O 2 Composition. When the powder was subjected to X-ray diffraction measurement, it was confirmed that the pattern of the powder was similar to LiCoO in 36-1004 of ICDD (Interna...

Embodiment 2

[0113] The cross-sectional structure of the non-aqueous secondary battery as the second embodiment of the present invention is given below. Because the non-aqueous secondary battery has figure 1 The non-aqueous electrolyte secondary battery shown has the same configuration, and the elements having the same operations and functions are denoted by the same reference numerals, so detailed explanations thereof are omitted.

[0114] By caulking the gasket 7, the battery cover 4, the safety valve device 5 and the positive temperature coefficient element (PTC element) 6 located in the battery cover 4 are connected to the open end of the same battery container 1. The inside of the battery container 1 is sealed. The battery cover 4 is made of, for example, the same material as the battery container 1. The safety valve device 5 is electrically connected to the battery cover 4 through the positive temperature coefficient element 6, so that when the internal pressure of the battery reaches a ...

Embodiment 3

[0139] The non-aqueous electrolyte secondary battery given as the third embodiment of the present invention has figure 1 The non-aqueous electrolyte secondary battery shown has the same structure, except that the anode includes a specific negative electrode active material. Therefore, elements having the same operations and functions as those of the non-aqueous electrolyte secondary battery of the first embodiment are denoted by the same reference numerals, and detailed explanations thereof are omitted.

[0140] In the non-aqueous electrolyte secondary battery given as the third embodiment, the cathode 11 is composed of, for example, a cathode composite mixture layer and a cathode current collector layer. The cathode composite mixture layer is located on both surfaces or one surface of the cathode current collector layer in the structure. The cathode current collector layer is composed of metal foil, for example, aluminum foil, nickel foil or stainless steel foil. In the cathode c...

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Abstract

The invention discloses a positive electrode active material which comprises a compound represented by the general formula: LimMxM'yM'' zO2, wherein M is at least one element selected from among Co, Ni and Mn, M' is at least one element selected from among Al, Cr, V, Fe, Cu, Zn, Sn, Ti, Mg, Sr, B, Ga, In, Si and Ge, M'' is at least one element selected from among Mg, Ca, B and Ga, 0.9 <=x <= 1, 0.001 <= y <= 0.5, 0 <= z <= 0.5 and 0.5 <= m; and the active material which further comprises a lithium manganese complex oxide represented by the general formula: LisMn2-tMatO4 wherein 0.9 <= s, 0.01 <= t <= 0.5, and Ma is one or more of Fe, Co, Ni, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si and Ge. The positive electrode active material allows the suppression of the rise in the temperature of a cell in the case of overcharging, while maintaining the capacity of the cell at a high level.

Description

Technical field [0001] The present invention relates to a positive active material capable of reversibly doping or dedoping lithium and a non-aqueous electrolyte secondary battery using the positive active material. Background technique [0002] In recent years, with the development of various small and wireless electronic devices, in order to have high capacity and reduce weight, secondary batteries have been required as a power source to drive them. As representative secondary batteries, there are well-known lead-acid batteries, alkaline storage batteries, lithium secondary batteries, and the like. Particularly among the above-mentioned secondary batteries, lithium secondary batteries are non-aqueous electrolyte secondary batteries using lithium ion doping and dedoping and can achieve high capacity, and they have been studied in various aspects. [0003] For example, for a lithium-ion secondary battery that can realize a non-aqueous electrolyte secondary battery capable of high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38C01G45/00C01G51/00C01G53/00H01M2/34H01M4/02H01M4/36H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525H01M10/36H01M10/42
CPCH01M4/505C01G45/1242H01M4/525C01G53/54H01M2/345C01P2006/40C01P2002/54H01M4/485H01M10/0525C01P2006/12Y02E60/122C01G51/54C01P2006/10H01M4/364H01M10/4235H01M2004/021C01P2006/80H01M50/578Y02E60/10H01M4/38
Inventor 田中健彦细谷洋介山本佳克铃木清彦古贺景三
Owner MURATA MFG CO LTD
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