Positive active material and nonaqueous electrolyte secondary battery produced using the same

Active Publication Date: 2005-01-26
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these schemes still have difficulties in significantly improving the high-temperature characteristics of non-aqueous electrolyte secondary batteries
In addition, when composite oxides of lithium and transition metals are used as positive electrode active materials, the internal resistance of the battery increases due to its relatively poor electronic conductivity.
Unfortunately, depending on the type of coating material used, the coating may further reduce the electronic conductivity of the positive active material

Method used

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  • Positive active material and nonaqueous electrolyte secondary battery produced using the same
  • Positive active material and nonaqueous electrolyte secondary battery produced using the same
  • Positive active material and nonaqueous electrolyte secondary battery produced using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] Embodiments of the present invention will now be described with reference to experimental results.

[0047] Sample 1

[0048] Synthesis of composite oxides of lithium and transition metals

[0049] The purchased aqueous solution of nickel nitrate and the purchased aqueous solution of manganese nitrate are mixed so that the ratio of nickel element to manganese element is 7:3. Next, aqueous ammonia was added dropwise to the mixed solution and vigorously stirred to prepare a composite hydroxide. This composite hydroxide was mixed with lithium hydroxide. The mixture was sintered in oxygen at 850° C. for 10 hours, and ground to prepare lithium-nickel-manganese oxide powder. Laser diffraction measurement revealed that the powder had an average particle diameter of 13 μm. In addition, X-ray diffraction measurements show that the specific structure of the powder is similar to that of LiNiO in ICDD 09-0063 2 specific structure. The similarity proves that the powder is ...

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Abstract

A positive active material is composed of particles of a compound oxide of lithium and a transition metal. This compound oxide has a layered structure. A coating layer of an inorganic compound and a carbonaceous material is formed on at least part of each surface of the particles. The inorganic compound is a lithium compound. The weight ratio of the inorganic compound to the carbonaceous material ranges between 99:1 and 60:40. The weight ratio of the particles to the coating layers ranges between 98:2 and 70:30.

Description

technical field [0001] The present invention relates to a positive electrode active material composed of a composite oxide of lithium and a transition metal, and the composite oxide has a layer structure. The invention also relates to a non-aqueous electrolyte secondary battery manufactured by using the positive electrode active material. More specifically, the present invention relates to a positive active material having superior high-temperature characteristics and a nonaqueous electrolyte secondary battery manufactured using the positive active material. Background technique [0002] A variety of portable electronic devices such as camcorders, cellular phones, and notebook computers are now commercially available. Demands for such devices are rapidly increasing, which further relate to a reduction in the size and weight of these devices. This reduction requires batteries, especially secondary batteries, to have higher energy density for use as portable power sources. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05H01M4/02H01M4/36H01M4/485H01M4/62
CPCH01M4/133H01M4/5825Y02E60/122H01M4/136H01M4/625H01M4/525H01M4/13H01M4/505H01M4/131H01M4/366H01M4/364H01M4/485Y02E60/10H04Q1/06H04Q1/146
Inventor 细谷洋介山本佳克
Owner MURATA MFG CO LTD
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