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Positive electrode active material for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

A positive active material, secondary battery technology, applied in non-aqueous electrolyte batteries, active material electrodes, secondary batteries, etc., can solve the problem of lack of short-circuit resistance characteristics discussion and research

Pending Publication Date: 2021-01-12
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 discussion and research on the short-circuit resistance characteristics in any of the proposals

Method used

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  • Positive electrode active material for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Positive electrode active material for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Positive electrode active material for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0198] As the base material, a known technology obtained by mixing and firing a composite oxide containing Ni as the main component and lithium hydroxide was used. 1.01 Ni 0.80 co 0.10 mn 0.10 o 2 Represented lithium-nickel composite oxide particles.

[0199] Added to 150g of the base material, the ratio Li / W of the contained lithium (Li) to tungsten (W) was adjusted to 2, the tungsten concentration was 0.86mol / L, the pH was 8.4, and the temperature was 25°C 150mL of liquid tungsten-containing alkaline solution, and then stirred for 10 minutes.

[0200] In addition, when preparing a tungsten-containing alkaline solution, lithium hydroxide was used as a base, tungsten trioxide was used as a tungsten compound, and water was used as a solvent.

[0201] After stirring, solid-liquid separation was performed by filtering using a Buchner funnel (Nutche). The water content of the cake (cake) after solid-liquid separation, that is, the raw material mixture was 9.5% (mass ratio) (...

Embodiment 2

[0214] As the base material, the composition of Li 1.03 Ni 0.70 co 0.15 mn 0.15 o 2 The lithium nickel composite oxide was the same as in Example 1 except for this point, whereby a positive electrode active material was obtained and evaluated. The evaluation results are shown in Table 1.

[0215] It should be noted that the composition of the obtained positive electrode active material was analyzed by the ICP method, and it was confirmed that the molar ratio of Li:Ni:Co:Mn was 1.03:0.70:0.15:0.15, and the tungsten content relative to Ni, Co and The ratio of the total amount of substances of Mn was 0.9 at%.

[0216] From this, it can be confirmed that the ratio of the amount of lithium (Li), nickel (Ni), cobalt (Co), manganese (Mn) and tungsten (W) contained in the obtained positive electrode active material is Li:Ni:Co :Mn:W=1.03:0.70:0.15:0.15:0.009.

[0217] Observation of the obtained positive electrode active material with a scanning electron microscope (SEM) reveal...

Embodiment 3

[0220] Changing the composition of the base metal to Li 1.01 Ni 0.82 co 0.15 al 0.03 o 2 , was the same as in Example 1 except this point, whereby a positive electrode active material was obtained and evaluated. The evaluation results are shown in Table 1.

[0221] It should be noted that the composition of the obtained positive electrode active material was analyzed by the ICP method, and it was confirmed that the molar ratio of Li:Ni:Co:Al was 1.01:0.82:0.15:0.03, and the tungsten content relative to Ni, Co and The ratio of the total amount of substances of Al was 1.1 atomic %.

[0222] From this, it can be confirmed that the ratio of the amount of lithium (Li), nickel (Ni), cobalt (Co), aluminum (Al) and tungsten (W) contained in the obtained positive electrode active material is Li:Ni:Co :Al:W=1.01:0.82:0.15:0.03:0.011.

[0223] Observation of the obtained positive electrode active material with a scanning electron microscope (SEM) confirmed that the lithium-nickel ...

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Abstract

Provided is a positive electrode active material for a non-aqueous electrolyte secondary battery, the positive electrode active material comprising: particles of lithium-nickel composite oxide havinga layered hexagonal structure; and a lithium tungstate coating disposed on the surface of secondary particles of the lithium-nickel composite oxide particles, wherein the positive electrode active material contains, as metal elements, W and at least one element M selected from among Li, Ni, Co, Mn, V, Mg, Mo, Nb, Ti, Ca, Cr, Zr, Ta, and Al, the ratios of the elements satisfy Li:Ni:Co:M:W=a:1-x-y:x:y:z (0.97<= a <=1.25, 0<= x <=0.35, 0<= y <=0.35, 0.005<= z <=0.030), and the ratio of the maximum concentration of tungsten to the average concentration of tungsten in the particle cross-sections is5-25.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, with the popularization of portable electronic devices such as mobile phones and notebook computers, the development of a small and lightweight non-aqueous electrolyte secondary battery with high energy density has been strongly desired. In addition, there is also a strong desire to develop a high-output secondary battery for use as a battery for electric vehicles including hybrid vehicles. [0003] As a secondary battery that can meet such demands, a lithium ion secondary battery has been proposed. This lithium ion secondary battery is composed of, for example, a negative electrode, a positive electrode, an electrolytic solution, and the like, and a material capable of intercalating and releasing lithium is used for the active material of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/36H01M4/505
CPCH01M4/525Y02E60/10H01M4/366H01M10/052H01M4/1391H01M10/4235H01M4/62H01M4/505H01M2004/028H01M4/58
Inventor 小鹿裕希金田治辉横山润
Owner SUMITOMO METAL MINING CO LTD
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