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Positive electrode active material for lithium ion secondary battery, method for producing same, and lithium ion secondary battery

A positive electrode active material and secondary battery technology, applied in the direction of active material electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of gas generation, achieve the effect of inhibiting gas generation and improving cycle characteristics

Active Publication Date: 2021-09-24
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, lithium-ion secondary batteries also have cases where the electrolyte is decomposed during battery use, which may cause gas generation.

Method used

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  • Positive electrode active material for lithium ion secondary battery, method for producing same, and lithium ion secondary battery
  • Positive electrode active material for lithium ion secondary battery, method for producing same, and lithium ion secondary battery
  • Positive electrode active material for lithium ion secondary battery, method for producing same, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0174] Hereinafter, the present invention will be described in more detail based on examples and comparative examples, but the present invention is not limited to the following examples.

[0175] It should be noted that in the following experimental examples, unless otherwise specified, various special-grade samples manufactured by Wako Pure Chemical Industries, Ltd. were used in the preparation of the nickel-manganese composite compound and the positive electrode active material.

[0176] Among them, first, the evaluation method of the positive electrode active material and the secondary battery obtained in the following experimental examples will be described.

[0177] (Evaluation of positive electrode active material)

[0178] The obtained positive electrode active material was evaluated as follows.

[0179] (a) Composition

[0180] The composition of the positive electrode active material was evaluated by analysis using an ICP emission spectrometer (manufactured by VARIA...

experiment example 1

[0221] (1) Manufacture of nickel manganese composite compound

[0222] (Crystalization process)

[0223] First, half the amount of water was put into a reaction tank (60 L), and the temperature in the tank was set to 49° C. while stirring. At this point, nitrogen gas (N 2 ) and air (Air), and adjust the N concentration so that the dissolved oxygen concentration in the reaction tank becomes 1.5 mg / L or more and 2.5 mg / L or less. 2 The flow of / Air has been adjusted.

[0224] Add an appropriate amount of alkaline aqueous solution, that is, 25% by mass of sodium hydroxide aqueous solution, and a complexing agent, that is, 25% by mass of ammonia water, to the water in the reaction tank, and the pH value becomes 12.4 at a liquid temperature of 49° C. The initial aqueous solution was prepared so that the concentration became 12 g / L.

[0225] At the same time, nickel sulfate, manganese sulfate, and cobalt sulfate were dissolved in pure water so that the ratio of nickel, manganese...

experiment example 2

[0259] When producing the positive electrode active material, in the mixing process, the ratio of the number of atoms of lithium (Li) contained in the obtained raw material mixture to the metal (Me) other than lithium, that is, Li / Me becomes 1.015, and nickel-manganese composite The same raw materials as in Experimental Example 1 were weighed and mixed so that the ratio of the atomic number of zirconium to the total atomic number of zirconium in the oxide particles and the zirconium oxide was 0.35 at.%.

[0260] Except for this, a positive electrode active material was produced and evaluated in the same manner as in Experimental Example 1, and a secondary battery was produced and evaluated using this positive electrode active material.

[0261] The composition and heterogeneous phases of the obtained positive electrode active material were confirmed, thus confirming that the positive electrode active material obtained in this experimental example is composed of the general form...

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Abstract

Provided is a positive electrode active material for a lithium ion secondary battery, the positive electrode active material containing particles of a lithium composite oxide containing Li, Ni, Mn, Zr, and additive element M at a material amount ratio of Li:Ni:Mn:Zr:M=a:b:c:d:e (0.95<=a<=1.20, 0.70<=b<=0.98, 0.01<=c<=0.20, 0.0003<=d<=0.01, 0.01<=e<=0.20, and additive element M is at least one element selected from among Co, W, Mo, V, Mg, Ca, Al, Ti, and Ta), wherein the unit lattice volume V (A3) obtained from lattice constants a and c is 117.5 A3 to118.0 A3, and the ratio of the peak intensity of (003) plane to the peak intensity of (104) plane is at least 1.70, as calculated from the X-ray diffraction pattern of the lithium composite oxide.

Description

technical field [0001] The present invention relates to a positive electrode active material for a lithium ion secondary battery, a method for producing a positive electrode active material for a lithium ion secondary battery, and a lithium ion secondary battery. Background technique [0002] In recent years, with the popularization of portable electronic devices such as mobile phones and laptop computers, there has been an increasing demand for the development of small and lightweight secondary batteries with high energy density and durability. In addition, there is an increasing demand for the development of high-output secondary batteries as batteries for electric tools and electric vehicles including hybrid vehicles. In addition, in addition to the above-mentioned required characteristics, there is also a demand for a secondary battery that does not deteriorate easily and has high durability even after repeated use. [0003] As a secondary battery that can satisfy such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525
CPCH01M4/525Y02E60/10C01G53/50C01P2004/60C01P2004/61C01P2006/12C01P2006/40C01P2004/32C01P2004/03C01P2002/77C01P2002/72C01P2002/74C01G53/006C01P2006/80H01M10/0525H01M4/62H01M2004/028H01M4/0471H01M4/505H01M2004/021C01G45/1228
Inventor 金田治辉小鹿裕希
Owner SUMITOMO METAL MINING CO LTD