Positive electrode active material for lithium ion secondary batteries, method for producing the positive electrode active material for lithium ion secondary batteries, and lithium ion secondary battery

A positive electrode active material and secondary battery technology, applied in the direction of active material electrodes, secondary batteries, battery electrodes, etc., can solve problems such as helpless conduction, increase in interface resistance, damage, etc., and achieve high destructive strength and coating properties good effect

Active Publication Date: 2020-04-21
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the aggregation structure of the secondary particles of the lithium composite compound is easily broken by such stress, and therefore, there is a problem of generating isolated particles that do not contribute to the conduction of lithium and electrons, or increasing the interface resistance.

Method used

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  • Positive electrode active material for lithium ion secondary batteries, method for producing the positive electrode active material for lithium ion secondary batteries, and lithium ion secondary battery
  • Positive electrode active material for lithium ion secondary batteries, method for producing the positive electrode active material for lithium ion secondary batteries, and lithium ion secondary battery
  • Positive electrode active material for lithium ion secondary batteries, method for producing the positive electrode active material for lithium ion secondary batteries, and lithium ion secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0145] First, as starting materials, lithium carbonate, nickel hydroxide, cobalt carbonate, and manganese carbonate were prepared. Next, each raw material was weighed so that Li:Ni:Co:Mn in atomic ratio was 1.04:0.80:0.10:0.10, pulverized with a pulverizer, and wet mixed to prepare a slurry (mixing step S10).

[0146] Next, after drying the obtained slurry with a spray dryer, the dried mixture is fired to obtain fired powder of the lithium complex compound (fired step S20). Specifically, 300 g of the mixture obtained by drying the slurry was filled into an alumina container having a length of 300 mm, a width of 300 mm, and a height of 100 mm, followed by heat treatment in an atmospheric atmosphere at 350° C. for 1 hour in a continuous transport furnace to obtain a first precursor ( The first heat treatment step S21). Then, the first precursor was heat-treated at 650° C. for 4 hours in an oxygen stream in a calcining furnace replaced with an atmosphere having an oxygen concent...

Embodiment 2

[0149] A positive electrode active material was obtained in the same manner as in Example 1, except that the particle size of the positive electrode active material was changed, and the water washing step S30 and the drying step S40 were not performed.

Embodiment 3

[0151] A positive electrode active material was obtained in the same manner as in Example 2, except that the heat treatment temperature in the third heat treatment step S23 was set to 825°C.

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Abstract

The present invention provides: a positive electrode active material for lithium ion secondary batteries, which has good coating workability, and wherein secondary particles that constitute a powder have high breaking strength; a method for producing a positive electrode active material for lithium ion secondary batteries; and a lithium ion secondary battery. The positive electrode active materialfor lithium ion secondary batteries according to the present invention contains primary particles of a lithium composite compound represented by formula (1) and secondary particles, in each of whichthe primary particles aggregate; the ratio of the average particle diameter of the primary particles to the average particle diameter of the secondary particles is from 0.006 to 0.25 (inclusive); theamount of lithium carbonate is 0.4% by mass or less; and the breaking strength of the secondary particles is 30 MPa or more. The formula (1) is Li<1+a>NixCoyM1<1-x-y-z>M2<z>O<2+alpha>, wherein M1 represents at least one element selected from the group consisting of Mn and Al; M2 represents at least one element selected from the group consisting of Mg, Ti, Zr, Mo and Nb; -0.1 <= a <= 0.2; 0.7 <= x< 1.0; 0 <= y < 0.3; 0 <= z <= 0.25; 0 < 1-x-y-z< 0.3; and -0.2 <alpha<= 0.2.

Description

technical field [0001] The present invention relates to a positive electrode active material for lithium ion secondary batteries, a method for producing a positive electrode active material for lithium ion secondary batteries, and a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary batteries have been widely used as small and lightweight secondary batteries having high energy density. Compared with other secondary batteries such as nickel-metal hydride storage batteries and nickel-cadmium storage batteries, lithium-ion secondary batteries have the characteristics of high energy density and small memory effect. Therefore, from small power sources such as portable electronic equipment and household appliances to stationary power sources such as power storage devices, uninterruptible power supply devices, power leveling devices, etc., as well as ships, railway vehicles, hybrid railway vehicles, hybrid vehicles, electric vehicles, etc. The use o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G53/00H01M4/505
CPCH01M4/505H01M4/525C01G53/50C01G53/42C01P2004/03C01P2004/54C01P2006/12C01P2002/54C01P2002/52C01P2004/45C01P2004/51C01P2004/61C01P2004/62C01P2006/16H01M2004/028H01M4/131H01M10/052Y02E60/10C01G53/44C01P2004/50C01P2006/14C01P2006/40H01M10/0525H01M2004/021
Inventor 高野秀一军司章所久人中岛源卫远山达哉高桥心
Owner HITACHI METALS LTD
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