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Positive electrode active material, positive electrode, secondary battery, battery pack, and electric vehicle

A technology of secondary battery and positive electrode, which is applied in the direction of secondary battery, secondary battery repair/maintenance, electric vehicle, etc., can solve the problems of load characteristics decrease, increase, difficult insertion and extraction, etc., and achieve the effect of improving load characteristics

Active Publication Date: 2017-08-11
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, lithium ions are difficult to insert and extract mainly due to the increased resistance, and therefore, the load characteristics are degraded

Method used

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  • Positive electrode active material, positive electrode, secondary battery, battery pack, and electric vehicle
  • Positive electrode active material, positive electrode, secondary battery, battery pack, and electric vehicle
  • Positive electrode active material, positive electrode, secondary battery, battery pack, and electric vehicle

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Embodiment 1 to 15

[0211] [Synthesis of positive electrode active material]

[0212] A lithium-containing compound as a positive electrode active material was obtained by the following procedure. First, manganese sulfate (MnSO 4 ), cobalt sulfate (CoSO 4 ) and nickel sulfate (NiSO 4 )mix. After that, the mixture is processed by using a coprecipitation method to obtain a mixed hydroxide. Subsequently, the mixed hydroxide and lithium hydroxide (LiOH) were mixed, after which the mixture was calcined in air. Thus, as shown in Table 1, a lithium-rich lithium-containing compound having a layered salt type crystal structure was obtained. When obtaining the lithium-containing compound, the compounding ratio of the raw materials is adjusted so as to obtain a desired composition (molar ratio). In addition, by changing the pH of the co-precipitation method and the temperature during calcination, the surface area S (m 2 / g), crystallite diameter D (μm) and product SD (10 -6 m 3 / g) to adjust.

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Abstract

A cathode active material is a lithium-rich lithium-containing compound having a bedded salt-type crystal structure. A product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer is equal to or more than about 1.4×10−6 cubic meters per gram.

Description

technical field [0001] The present invention relates to a positive electrode active material as a lithium-containing compound, to a positive electrode and a secondary battery using the same, and to a battery pack, an electric vehicle, a power storage system, an electric tool, and an electronic device using the same . Background technique [0002] In recent years, various electronic devices such as mobile phones and personal digital assistants (PDAs) have been widely used, and it is required to further reduce the size and weight of the electronic devices and realize their long lifespan. Therefore, as a power source for electronic devices, batteries, particularly small and lightweight secondary batteries capable of providing high energy density, have been developed. Recently, application of such secondary batteries to various other applications other than the above-described electronic devices has been considered. Representative examples of such other applications include ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/131H01M4/386H01M4/505H01M4/525H01M4/587H01M10/0525H01M10/425H01M2220/10H01M2220/20Y02E60/10Y02T10/70
Inventor 本桥一成远藤一显辻洋悦细谷洋介
Owner MURATA MFG CO LTD