Nonaqueous electrolyte battery

A non-aqueous electrolyte and battery technology, which is applied in the manufacture of non-aqueous electrolyte batteries, electrodes of non-aqueous electrolyte batteries, and electrolyte batteries, and can solve problems such as side reactions and capacity reduction

Active Publication Date: 2015-03-25
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-nickel composite oxides are prone to side reactions on the electrode, which has the disadvantage of decreasing capacity when repeated cycles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0016] Embodiments provide a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive electrode current collector and a positive electrode active material-containing layer formed on the positive electrode current collector. The positive electrode active material-containing layer contains at least one lithium-nickel composite oxide and a conductive agent. In the particle size distribution obtained by the laser diffraction scattering method of the layer containing the positive electrode active material, the average particle diameter d 50 In the range of 1 μm to 5.5 μm, the maximum particle size is in the range of 10 μm to 100 μm, and the cumulative frequency from the small particle size side is 10% particle size d 10 It is in the range of 0.5 μm to 3 μm. By X=(d 50 -d 10 ) / d50 is in the range of 0.5 or more and less than 1.

[0017] The li...

Embodiment 1

[0118] In Example 1, follow the steps below to make Figure 1 ~ Figure 3 The non-aqueous electrolyte battery 1 shown.

[0119] [Production of positive electrode 6]

[0120] As the positive electrode active material, LiNi with an average particle size of 6 μm is used 7 / 10 co 2 / 10 mn 1 / 10 o 2 . The active material, acetylene black, graphite and polyvinylidene fluoride were mixed in a ratio of 100:8:5:3 according to the following steps. First, the active material, acetylene black and graphite are dry mixed using a Henschel mixer. After dry mixing, polyvinylidene fluoride and N-methyl-2-pyrrolidone were added to the obtained dry mixture, and wet mixing was performed with a planetary mixer. Thereby, a mixture containing each material in the above ratio was produced.

[0121] Next, the obtained mixture was put into an autorotation-revolution mixer THINKY Seinataro (ARE-250), and the rotation speed was set at 2000 rpm, and stirring was performed for 30 minutes. Next, the mix...

Embodiment 2

[0146] In Example 2, the nonaqueous electrolyte battery 1 was produced in the same procedure as in Example 1 except that the rotational speed of the sand mill was set to 1000 rpm.

[0147] Regarding the non-aqueous electrolyte battery 1 of Example 2, the charge-discharge cycle characteristics and particle size distribution were evaluated in the same manner as in Example 1.

[0148] The capacity retention rate after 300 cycles of the non-aqueous electrolyte battery 1 of Example 2 was 85%. In addition, in the particle size distribution related to the non-aqueous electrolyte battery 1 of Example 2, the average particle size d 50 3.9μm, particle size d 10 is 1.37 μm, the maximum particle size is 15.4 μm, and the value of X is 0.65.

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Abstract

Embodiments of the invention provide a nonaqueous electrolyte battery with good charge-discharge cycle performance. Embodiments provide a nonaqueous electrolyte battery (1) including a positive electrode (6), a negative electrode (7), and a nonaqueous electrolyte. The positive electrode (6) includes a positive electrode current collector (61) and a positive electrode active material-containing layer (62) formed on the positive electrode current collector (61). The positive electrode active material-containing layer (62) includes at least one lithium-nickel composite oxide and a conductive agent. The positive electrode active material-containing layer (62) has, in a particle size distribution obtained by a laser diffraction scattering method, an average particle diameter d50 within a range of 1 [mu]m to 5.5 [mu]m, a maximum particle diameter within a range of 10 [mu]m to 100 [mu]m, a particle diameter d10, with a cumulative frequency of 10% from the small particle size side, within a range of 0.5 [mu]m to 3 [mu]m, and X, represented by X = (d50 - d10 ) / d50, within a range of 0.5 to less than 1.

Description

[0001] This application is based on Japanese patent application 2013-193475 (filing date: September 18, 2013) and Japanese patent application 2014-177776 (filing date: September 2, 2014), and enjoys priority from the above applications. This application incorporates the above application in its entirety by reference to the above application. technical field [0002] Embodiments of the present invention relate to nonaqueous electrolyte batteries. Background technique [0003] Lithium-ion secondary batteries, which are non-aqueous electrolyte batteries, have been introduced into electronic devices such as smartphones and notebook personal computers, and vehicles such as hybrid cars, plug-in hybrid cars, and electric cars, and have become popular. A lithium ion secondary battery can be produced, for example, by laminating a positive electrode and a negative electrode through a separator to form an electrode group, or by winding the laminate formed as described above to obtain a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13
CPCH01M4/505H01M4/525H01M4/625H01M10/058C01P2004/51C01P2004/61H01M4/485H01M4/623H01M10/0525H01M2004/021Y02E60/10H01M4/131H01M4/366Y02T10/70
Inventor 吉川辉栗山和哉猿渡秀乡田中政典鹿野哲郎
Owner KK TOSHIBA
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