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Lithium primary battery

A lithium primary battery and lithium alloy technology, applied in battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of inability to suppress gas release and reduce the low-temperature characteristics of primary batteries, and achieve improved electrical characteristics, increased inhibition, and reliability Improved effect

Inactive Publication Date: 2006-02-01
PANASONIC CORP
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  • Abstract
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  • Claims
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Problems solved by technology

[0010] As mentioned above, in primary cells, although attempts are made to suppress the decomposition of the electrolyte and the dissolution of manganese on the positive electrode by reducing the specific surface area of ​​manganese oxide, the specific surface area can only be reduced to about 5m 2 / g, therefore, its impact is limited
In addition, when the specific surface area of ​​manganese oxide is reduced, the reaction area is also limited, so the method has the disadvantage of reducing the low temperature characteristics of the primary battery
In addition, when a lithium alloy is used on the negative electrode to reduce the internal resistance, the formation of the film on the surface of the negative electrode can be suppressed, but the gas release due to the decomposition of the electrolyte and the dissolution of manganese element, etc., in the positive electrode active material cannot be suppressed. Gas release is responsible for film formation

Method used

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  • Lithium primary battery

Examples

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Effect test

Embodiment 1

[0047] (i) Preparation of mixed crystalline manganese oxide comprising λ-manganese oxide and β-manganese oxide

[0048] First, manganese dioxide, lithium hydroxide, and lithium carbonate were mixed in a predetermined ratio, and the mixture was fired at 800° C. to prepare spinel-type lithium manganese oxide.

[0049] The obtained spinel-type lithium manganese oxide was immersed in a sulfuric acid solution to remove lithium in the lithium manganese oxide. Then, the obtained manganese oxide was washed and dried to obtain λ-manganese oxide with a lithium content of 1.5% by weight.

[0050] The resulting λ-manganese oxide was heat-treated in air at 200°C for 2 hours to obtain an average particle size of 15 μm and a specific surface area of ​​2.0 m 2 / g and mixed crystalline manganese oxide with a crystallinity of β-manganese oxide of 400. Lithium content and manganese content did not change before and after heat treatment.

[0051] The crystallinity, lithium content, average par...

Embodiment 2

[0086] Except that the heat treatment of λ-manganese oxide was carried out at 50°C for 2 hours, the mixed crystalline manganese oxide was prepared by the same method as in the preparation of manganese oxide in battery A1, the average particle size of the mixed crystalline manganese oxide was 15 μm, and the specific surface area 2.0m 2 / g, the crystallinity of β-manganese oxide is 100. Battery B1 was prepared in the same manner as battery A1 except that the above-mentioned manganese oxide was used.

[0087] Except that the heat treatment of λ-manganese oxide was carried out at 75°C for 2 hours, the mixed crystalline manganese oxide was prepared by the same method as in the preparation of manganese oxide in battery A1, the average particle size of the mixed crystalline manganese oxide was 15 μm, and the specific surface area 2.0m 2 / g, and the crystallinity of β-manganese oxide is 200. Battery B2 was prepared in the same manner as battery A1 except that the above-mentioned ma...

Embodiment 3

[0098] Except that the calcination temperature of the raw material mixture of spinel-type lithium manganese oxide is 950°C, a mixed crystalline manganese oxide is prepared by the same method as the manganese oxide in battery A1, and the average particle size of the mixed crystalline manganese oxide is 15 μm , the specific surface area is 0.2m 2 / g, and the crystallinity of β-manganese oxide is 400. Battery C1 was prepared in the same manner as battery A1 except that the above-mentioned manganese oxide was used.

[0099] Except that the calcination temperature of the raw material mixture of spinel-type lithium manganese oxide is 900°C, the same method as in the preparation of manganese oxide in battery A1 is used to prepare mixed crystalline manganese oxide, and the average particle size of the mixed crystalline manganese oxide is 15 μm , the specific surface area is 0.5m 2 / g, and the crystallinity of β-manganese oxide is 400. Battery C2 was prepared in the same manner as b...

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Abstract

The present invention provides a lithium primary battery including: a positive electrode containing a mixed crystalline manganese oxide; a negative electrode containing at least one selected from the group consisting of lithium and a lithium alloy; and a lithium-ion conductive non-aqueous electrolyte. The mixed crystalline manganese oxide contains at least -type manganese oxide and -type manganese oxide, and the -type manganese oxide has a crystallinity of 300 to 500. The mixed crystalline manganese oxide preferably has a specific surface area of 0.5 to 4 m 2 / g. The lithium alloy preferably contains at least aluminum in an amount of 0.2 wt% to 15 wt%.

Description

technical field [0001] The invention relates to a lithium primary battery using a non-aqueous electrolyte. More specifically, the present invention relates to the optimization of the physical properties of manganese oxide for use as anode active material in lithium primary batteries. This optimization improves the storage characteristics, electrical characteristics, reliability and versatility of lithium primary batteries, especially at high temperatures. Background technique [0002] Generally, lithium primary batteries are widely used in devices with an ambient temperature of about -20-60° C., which is close to the temperature range of human life. However, as the range of applications of battery-powered devices has expanded recently, the operating temperature range of these devices has also tended to expand accordingly. For example, in automotive equipment, primary batteries are increasingly required to be able to maintain their functionality for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M4/38H01M6/14
CPCY02E60/12
Inventor 住本大辅冈久贡吉田正彦池畠敏彦
Owner PANASONIC CORP
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