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Positive-electrode active material for nonaqueous-electrolyte secondary battery and positive electrode for nonaqueous-electrolyte secondary battery

A technology of positive electrode active material and non-aqueous electrolyte, applied in the field of positive electrode active material for non-aqueous electrolyte secondary battery and positive electrode for non-aqueous electrolyte secondary battery, can solve the problems of reduced discharge capacity, easy decomposition of electrolyte, etc. Dissolution effect

Active Publication Date: 2016-11-09
PANASONIC ENERGY CO LTD MORIGUCHI SHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the charging voltage of the battery is increased, there is a problem that the electrolyte is easily decomposed, especially when the battery is stored at a high temperature or the charge-discharge cycle is repeated at a high temperature, the problem of a decrease in the discharge capacity occurs.

Method used

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  • Positive-electrode active material for nonaqueous-electrolyte secondary battery and positive electrode for nonaqueous-electrolyte secondary battery
  • Positive-electrode active material for nonaqueous-electrolyte secondary battery and positive electrode for nonaqueous-electrolyte secondary battery
  • Positive-electrode active material for nonaqueous-electrolyte secondary battery and positive electrode for nonaqueous-electrolyte secondary battery

Examples

Experimental program
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Effect test

preparation example Construction

[0056] [Preparation of non-aqueous electrolyte]

[0057] Lithium hexafluorophosphate (LiPF 6 ) was dissolved so as to have a concentration of 1.0 mol / liter to prepare a nonaqueous electrolyte (nonaqueous electrolyte solution).

[0058] [Production of battery]

[0059] Install lead terminals on the above-mentioned positive and negative electrodes respectively, arrange a separator between these two poles, and after winding into a spiral shape, pull out the winding core to make a spiral electrode body, and then flatten the electrode body to obtain a flat shape the electrode body. Next, this flat electrode body and the above-mentioned non-aqueous electrolytic solution were inserted into a case made of an aluminum laminate, and sealed to fabricate a battery A1. The design capacity (discharge capacity when charged to 4.40 V and discharged to 2.75 V) of the battery A1 is 750 mAh.

[0060] (Experiment 2)

[0061] Battery A2 was fabricated in the same manner as in Experiment 1 abo...

experiment example 11

[0079] Instead of erbium nitrate pentahydrate, use samarium nitrate hexahydrate (Sm(NO 3 ) 3 ·6H 2 (0) 1.14 g, and the battery E1 was produced in the same manner as in Experiment 2 above. The attached amounts of samarium and fluorine were 0.085% by mass and 0.029% by mass, respectively, and the molar ratio of samarium to fluorine was 1:3.

experiment example 12

[0081] Instead of erbium nitrate pentahydrate, use neodymium nitrate hexahydrate (Nd(NO 3 ) 3 ·6H 2 (0) 1.12 g, and the battery F1 was fabricated in the same manner as in Experiment 2 above. The adhering amounts of neodymium and fluorine were 0.074% by mass and 0.029% by mass, respectively, and the molar ratio of neodymium to fluorine was 1:3.

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Abstract

This invention, which reduces elution of cobalt from a positive-electrode active material, provides a positive-electrode active material that is used in a nonaqueous-electrolyte secondary battery and contains a lithium-containing transition-metal oxide. Fluorine and at least one element selected from among zirconium, titanium, aluminum, magnesium, and the rare-earth elements are bound to the surface of said lithium-containing transition-metal oxide, which contains cobalt and has an average particle size of 10 [mu]m or less.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery and a positive electrode for a nonaqueous electrolyte secondary battery. Background technique [0002] In order to increase the energy density and output of lithium ion batteries, in addition to increasing the capacity of the active material and increasing the filling amount of the active material per unit volume, there is also a plan to increase the charging voltage of the battery. However, when the charging voltage of the battery is increased, there is a problem that the electrolyte is easily decomposed. In particular, when the battery is stored at a high temperature or repeatedly charged and discharged at a high temperature, the discharge capacity is reduced. [0003] Considering such a situation, a proposal for improving the surface of the positive electrode active material has been proposed. For example, Patent Document 1 proposes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G51/00H01M4/131H01M4/36C01F17/224
CPCH01M4/62H01M10/052C01G51/42C01P2004/51C01P2004/61C01P2004/86C01P2006/40C01P2004/64H01M4/525H01M4/366H01M4/621Y02E60/10C01F17/224C01G51/40H01M4/131H01M4/38H01M4/624H01M10/0525H01M2004/028
Inventor 佐藤大树小笠原毅砂野泰三
Owner PANASONIC ENERGY CO LTD MORIGUCHI SHI
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