Lithium metal composite oxide, lithium secondary battery positive electrode active material, positive electrode, and lithium secondary battery

A composite oxide and lithium secondary battery technology, which is applied in the direction of active material electrodes, secondary batteries, battery electrodes, etc., can solve the problems of easy power drop and battery internal resistance rise, and achieve less gas generation and low battery resistance , The effect of excellent power characteristics

Active Publication Date: 2020-10-16
SUMITOMO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when a lithium secondary battery is repeatedly charged and discharged, the internal resistance of the battery increases, making it easy to reduce power

Method used

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  • Lithium metal composite oxide, lithium secondary battery positive electrode active material, positive electrode, and lithium secondary battery
  • Lithium metal composite oxide, lithium secondary battery positive electrode active material, positive electrode, and lithium secondary battery
  • Lithium metal composite oxide, lithium secondary battery positive electrode active material, positive electrode, and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0242] Manufacture of positive electrode active material 1 for lithium secondary battery

[0243] [Manufacturing process of nickel-cobalt-manganese composite hydroxide]

[0244] After adding water to the reaction tank equipped with a stirrer and an overflow pipe, sodium hydroxide aqueous solution was added, and liquid temperature was maintained at 50 degreeC.

[0245] An aqueous nickel sulfate solution, an aqueous cobalt sulfate solution, and an aqueous manganese sulfate solution were mixed such that the atomic ratio of nickel atoms, cobalt atoms, and manganese atoms was 0.510:0.225:0.265, thereby preparing a mixed raw material solution.

[0246] Next, the mixed raw material solution and an aqueous solution of ammonium sulfate as a complexing agent were continuously added to the reaction tank under stirring so that the pH of the solution in the reaction tank when measured at 40° C. became 11.75. Aqueous sodium hydroxide solution was added. Then, feed an oxidizing gas mixed w...

Embodiment 2

[0254] Manufacture of positive electrode active material 2 for lithium secondary battery

[0255] [mixing process]

[0256] The nickel-cobalt-manganese composite hydroxide 1 and lithium carbonate powder were weighed and mixed so that the molar ratio became Li / (Ni+Co+Mn)=1.07.

[0257] [Firing process]

[0258] The mixture obtained in the above mixing step was fired at 930° C. for 5.6 hours under an oxygen atmosphere, thereby obtaining a fired product 2 .

[0259] [Coating process]

[0260] The calcined product 2 and alumina were weighed and mixed so that Al / (Ni+Co+Mn)=0.01, and heat-treated at 760° C. for 5 hours in an atmosphere to obtain a positive electrode active material for a lithium secondary battery 2.

[0261] Evaluation of Positive Electrode Active Material 2 for Lithium Secondary Batteries

[0262] Composition analysis was performed on the obtained positive electrode active material 2 for lithium secondary batteries, and when it corresponded to composition formul...

Embodiment 3

[0264] Manufacture of positive electrode active material 3 for lithium secondary battery

[0265] [Manufacturing process of nickel-cobalt-manganese composite hydroxide]

[0266] Except having mixed so that the atomic ratio of nickel atom, cobalt atom, and manganese atom might become 0.550:0.210:0.240, it carried out similarly to Example 1, and prepared the mixed raw material liquid.

[0267] Next, the mixed raw material solution and an aqueous solution of ammonium sulfate as a complexing agent were continuously added to the reaction tank under stirring so that the pH of the solution in the reaction tank when measured at 40° C. became 10.54. Aqueous sodium hydroxide solution was added. Then, feed an oxidizing gas mixed with nitrogen and air to adjust the various liquid amounts so that the reaction time becomes 20.1 hours to obtain nickel-cobalt-manganese composite hydroxide particles. After washing, it was dehydrated and separated with a centrifuge, and dried at 105° C., wher...

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Abstract

This lithium metal composite oxide that can be doped and undoped with lithium ions is characterized by including at least nickel and satisfying each of the following requirements (1)-(3): (1) A BET specific surface area is not more than 1.0 m<2> / g; (2) when an average secondary particle size D50 is X [mu]m and a calculated particle size is Y [mu]m, a ratio (X / Y) is 1.1-2.9, wherein, it is noted that the calculated particle size is calculated by the following method: calculated particle size (Y)=2*3 / (BET specific surface area * tap density); (3) the ratio (residual lithium amount / BET specific surface area) of an amount (mass%) of residual lithium contained in the lithium metal composite oxide relative to the BET specific surface area (m<2> / g) is not more than 0.25.

Description

technical field [0001] The present invention relates to a lithium metal composite oxide, a positive electrode active material for a lithium secondary battery, a positive electrode, and a lithium secondary battery. [0002] This application claims priority based on Japanese Patent Application No. 2018-036806 filed in Japan on March 1, 2018, the contents of which are incorporated herein. Background technique [0003] Lithium metal composite oxide powder is used as a positive electrode active material for lithium secondary batteries. Lithium secondary batteries have been put into practical use not only as small power sources for mobile phones and notebook computers, but also as medium and large power sources for automobiles and power storage. [0004] Lithium secondary batteries deteriorate due to repeated charging and discharging. For example, when charging and discharging a lithium secondary battery is repeated, the internal resistance of the battery increases, and the outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G53/00H01M4/505
CPCH01M4/525Y02E60/10H01M2004/028H01M2004/021C01G53/50C01P2006/12C01P2004/60C01P2004/61C01P2006/40C01P2006/80C01P2006/82C01P2002/54C01G53/006C01G53/42C01P2002/72C01P2002/70C01P2004/80C01P2006/11H01M4/505H01M10/052H01M10/0525
Inventor 高森健二小林亮太
Owner SUMITOMO CHEM CO LTD
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