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Electrode material for lithium-ion secondary battery and lithium-ion secondary battery

A technology for electrode materials and secondary batteries, which is applied in the field of electrode materials for lithium-ion secondary batteries and lithium-ion secondary batteries, can solve problems such as poor input and output characteristics, Li ion diffusivity, and low electronic conductivity, and achieve charging Effect of improving discharge characteristics

Active Publication Date: 2018-10-09
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] On the other hand, lithium iron phosphate has low Li ion diffusivity and low electronic conductivity, so its input and output characteristics are inferior to those of oxide-based positive electrode materials.
This difference in characteristics is more pronounced when the operating temperature of the battery is low, so lithium iron phosphate is considered unsuitable for in-vehicle applications such as hybrid vehicles that require high input and output characteristics in low temperature regions.

Method used

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  • Electrode material for lithium-ion secondary battery and lithium-ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] Lithium phosphate (Li 3 PO 4 ) and iron(II) sulfate (FeSO 4 ) are mixed in a molar ratio of Li:Fe:P=3:1:1. Furthermore, distilled water for preparation was mixed to prepare 600 ml of raw material slurry.

[0134] Next, the raw material slurry was stored in a pressure-resistant airtight container, hydrothermally synthesized at 180° C. for 2 hours, and then cooled to room temperature (25° C.) to obtain cake-shaped electrode active material particles precipitated in the container. After sufficiently washing the electrode active material particles with distilled water several times, the electrode active material particles and distilled water were mixed so that the concentration of the electrode active material particles became 60% by mass to prepare a suspension slurry.

[0135] This suspension slurry is dropped into sand mixer together with the zirconia ball of diameter 0.1mm, with the particle diameter (D90) of cumulative volume percentage 90% in the accumulation parti...

Embodiment 2

[0139] To the slurry that has been subjected to dispersion treatment by a sand mixer, a citric acid aqueous solution adjusted to 30% by mass in advance of 1.0% by mass in terms of citric acid solids is mixed with respect to the electrode active material particles, and the electrode in the slurry is further mixed. Except having mixed distilled water so that the active material particle concentration might become 25 mass %, it carried out similarly to Example 1, and produced the positive electrode material for lithium ion secondary batteries of Example 2.

Embodiment 3

[0141] The suspension slurry that is adjusted to be 60 mass % with the zirconia ball of diameter 1mm is dropped into the sand mixer together with the zirconia ball that is adjusted to the electrode active material particle concentration, in the electrode active material particle in the suspension slurry, with ratio (D90 / D10 ) was 25, except that the treatment time of the ball mill was adjusted and dispersion treatment was performed, and the positive electrode material for lithium ion secondary batteries of Example 3 was produced in the same manner as in Example 1.

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Abstract

The present invention provides an electrode material for a lithium-ion secondary battery, being able to reduce the volume resistance value of an electrode mixture layer and the interface resistance value of the electrode mixture layer and an aluminum current collector, provides a lithium-ion secondary battery having improved charge / discharge characteristics. The electrode material for a lithium-ion secondary battery includes an electrode active material made of a transition metal lithium phosphate compound having an olivine structure and a carbonaceous film coating the electrode active material, the specific surface area of the electrode active material is 10 m<2> / g to 25 m<2> / g, the average particle diameter of spherical secondary particles formed by granulating the primary particles of the electrode active material is 0.5 mu m to 15 mu m, and, regarding the content of spherical secondary particles having a circularity of, measured using a flow-type particle image analyzer, of 0.90 to0.95, the proportion of the number of the spherical secondary particles in the total number of all of single particles and spherical secondary particles present during the measurement of the degree of circularity is 18% or more. In a lithium-ion secondary battery, a cathode includes a cathode mixture layer formed using the electrode material.

Description

technical field [0001] The present invention relates to an electrode material for a lithium ion secondary battery, and a lithium ion secondary battery including an electrode using the electrode material. Background technique [0002] Lithium-ion secondary batteries have higher energy density and output density than lead-acid batteries and nickel-metal hydride batteries, and are used in various applications such as household backup power supplies and electric tools, represented by small electronic devices such as smartphones. Furthermore, large-capacity lithium-ion secondary batteries are being put into practical use for storage of renewable energy such as solar power generation and wind power generation. [0003] A lithium ion secondary battery includes a positive electrode, a negative electrode, an electrolytic solution, and a separator. As the electrode material constituting the positive electrode, lithium cobaltate (LiCoO 2 ) or lithium manganate (LiMn 2 o 4 ), lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/0525
CPCH01M4/136H01M4/366H01M4/5825H01M4/625H01M10/0525C01B25/45H01M4/621H01M4/624H01M2004/021H01M2004/028Y02E60/10Y02T10/70
Inventor 休石纮史山屋竜太
Owner SUMITOMO METAL MINING CO LTD
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