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Positive electrode for nonaqueous electrolyte secondary batteries, positive electrode active material used for same, and secondary battery using same

A positive active material, secondary battery technology, applied in non-aqueous electrolyte batteries, active material electrodes, secondary batteries, etc., can solve the problem of not mentioning battery performance, etc., to achieve improved intercalation and extraction, high lithium ion conductivity, Weather resistant effect

Inactive Publication Date: 2018-11-09
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mention in Non-Patent Document 3 that the use of other than BaTiO 3 Effects on battery performance in the case of dielectrics other than

Method used

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  • Positive electrode for nonaqueous electrolyte secondary batteries, positive electrode active material used for same, and secondary battery using same
  • Positive electrode for nonaqueous electrolyte secondary batteries, positive electrode active material used for same, and secondary battery using same
  • Positive electrode for nonaqueous electrolyte secondary batteries, positive electrode active material used for same, and secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] In this example, LiCoO 2 The thin film is used as the positive electrode active material, and LiNbO, which is a lithium-ion conductive oxide with good dielectric properties, is formed on its surface 3 film.

[0093] LiCoO produced under the same conditions as in Comparative Example 1 2 LiNbO is formed on the thin film (cathode active material 13) 3 Thin film (lithium ion conductive oxide 14), manufacture positive electrode thin film electrode 1. with LiCoO 2 A thin film was produced by the PLD method in the same manner. Will Li 2 O and Nb 2 o 5 After mixing, sintering is performed to form particles, which serve as targets. Under the conditions of 25°C and oxygen partial pressure of 20Pa, the LiCoO 2 LiNbO with a thickness of about 300nm is further formed on the film 3 Thin film, manufacture positive electrode thin film, confirm LiNbO by XRD (X-ray diffraction, X-ray diffraction) 3 state, resulting in an amorphous state. In addition, the positive electrode fi...

Embodiment 1a

[0103] In this example, up to the use of LiCoO 2 The thin film is used as the positive electrode active material, and LiNbO, which is a lithium ion conductive oxide with good dielectric properties, is formed on the surface 3 The positive electrode thin film electrode 1 was manufactured in the same manner as in Example 1. In the same manner as in Comparative Example 1a, the positive electrode thin-film electrode 1 was exposed to a high-humidity environment with an ambient temperature of 80° C. and a relative humidity of 60% for 24 hours, and then a coin cell was manufactured, and impedance measurement was performed.

[0104] Table 2 shows the positive electrode interface resistance and rate characteristics of Example 1a. Compared with the case of Comparative Example 1a, the positive electrode interface resistance value is smaller, and the increase rate relative to Example 1 is also suppressed. The same can be said for the rate characteristics. Think this is because, LiCoO 2...

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Abstract

Provided is a positive electrode for nonaqueous electrolyte secondary batteries, which enables a battery to have a higher output power if used as a positive electrode of the battery, and which causesless deterioration in the battery performance. Provided is a positive electrode for nonaqueous electrolyte secondary batteries, which comprises a positive electrode element that is configured from a positive electrode active material composed of a lithium metal composite oxide and an amorphous coating layer that is formed on the surface of the positive electrode element from a compound containingniobium and lithium, and wherein the compound is a lithium ion conductor. Consequently, lithium ion conductivity in the electrode is able to be improved, and deterioration in the lithium ion conductivity and dielectric properties in the atmosphere is able to be suppressed. In addition, a positive electrode for nonaqueous electrolyte secondary batteries, which is able to achieve a higher output power and is not susceptible to deterioration in the high output performance if handled in the atmosphere can be obtained by using the above-described electrode.

Description

technical field [0001] The present invention relates to a positive electrode for a nonaqueous electrolyte secondary battery, a positive electrode active material used for the positive electrode, and a secondary battery using the positive electrode and the positive electrode active material. Background technique [0002] In recent years, along with the popularization of portable electronic devices such as mobile phones and notebook personal computers, the development of small and lightweight non-aqueous electrolyte secondary batteries with high energy density has been eagerly expected. In addition, as batteries for electric vehicles, mainly hybrid vehicles, the development of high-output secondary batteries is highly expected. As a secondary battery satisfying the above requirements, there is a lithium ion secondary battery. [0003] Lithium-ion secondary batteries are composed of a positive electrode mainly composed of a positive active material, a negative electrode mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/62
CPCH01M4/131H01M4/366H01M4/525H01M10/052H01M4/485H01M2004/028Y02E60/10Y02P70/50H01M10/0585
Inventor 加藤三香子林彻太郎栗原好治
Owner SUMITOMO METAL MINING CO LTD
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