Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of greatly improving the rate characteristics, the large activation energy barrier of electrode reactions, etc., and achieve battery characteristics Improved effect

Active Publication Date: 2016-05-11
THE UNIV OF TOKYO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is generally considered that it is difficult to greatly improve the rate characteristics when using carbonate-based solvents.
That is, as described in the following non-patent documents 1 to 3, the activation energy barrier of the electrode reaction in carbonate-based solvents such as ethylene carbonate and propylene carbonate is large, and in order to improve the rate characteristics, it is necessary to completely change the solvent composition of the electrolyte solution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0547] The nonaqueous electrolyte secondary battery of Example 1-1 was fabricated using electrolytic solution E8.

[0548]

[0549] SECCARBON Co., Ltd. SNOGrade (average particle size: 15 μm) graphite (hereinafter sometimes referred to as graphite (A)), polyvinylidene fluoride (PVdF) and N-methyl-2-pyrrolidone (NMP) were added and mixed to prepare Slurry negative electrode mixture. The composition ratio of each component (solid content) in a slurry is graphite:PVdF=90:10 (mass ratio).

[0550] In addition, Raman spectroscopic analysis was performed on the graphite (A) powder used. As a device, RAMAN-11 manufactured by Nanophoton Corporation (excitation wavelength λ=532 nm, grating: 600 gr / mm, laser power: 0.02 mW) was used. The G / D ratio which is the intensity ratio of the peaks of the G band and the D band in the Raman spectrum was 12.2.

[0551] This slurry was applied to the surface of an electrolytic copper foil (current collector) having a thickness of 20 μm using a ...

Embodiment 1-2

[0558]Use the graphite of SNOGrade (average particle diameter 10 μ m) of SECCARBON Co., Ltd. (hereinafter, sometimes also referred to as graphite (B)) instead of graphite (A), except that, make the negative electrode in the same manner as in Example 1-1, and others are the same as in the implementation Example 1-1 The nonaqueous electrolyte secondary battery of Example 1-2 was obtained in the same manner. The graphite (B) used was subjected to Raman spectroscopic analysis in the same manner as in Example 1-1. As a result, the G / D ratio, which is the intensity ratio of the peaks of the G band and the D band, was 4.4.

Embodiment 1-3

[0560] Using graphite (C) with an average particle diameter of 10 μm instead of graphite (A), except that, a negative electrode was produced in the same manner as in Example 1-1, and the nonaqueous electrolyte of Example 1-3 was obtained in the same manner as in Example 1-1. secondary battery. In addition, Raman spectroscopic analysis was performed on the graphite (C) used in the same manner as in Example 1-1. As a result, the G / D ratio, which is the intensity ratio of the peaks of the G band and the D band, was 16.0.

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Abstract

The invention addresses the problem of improving battery characteristics by the optimum combination of an electrolyte and a negative electrode active material. In a non-aqueous electrolyte secondary battery, an electrolyte is used that contains a metal salt and an organic solvent having a heteroatom and satisfies the relationship Is>Io, where, for peak intensities derived from the organic solvent in a vibrational spectrum, Io is the intensity of a peak inherent in the organic solvent and Is is the intensity of a peak to which the peak inherent in the organic solvent shifts. As a negative electrode, any of the followings (1) to (5) is used: (1) graphite having a G / D ratio of 3.5 or more, said G / D ratio being the ratio of the peak of the G-band and the peak of the D-band in a raman spectrum, (2) carbon material having a crystallite size of 20 nm or less, said crystallite size being calculated from the half width of a peak appearing at 2theta = 20 DEG to 30 DEG in an x-ray diffraction profile measured by an x-ray diffraction method, (3) silicon element and / or tin element, (4) metal oxide that can absorb and release lithium ions, and (5) graphite having a major axis to minor axis ratio (major axis / minor axis) of 1 to 5.

Description

technical field [0001] The present invention relates to nonaqueous electrolyte secondary batteries such as lithium ion secondary batteries. Background technique [0002] For example, a lithium ion secondary battery is a secondary battery that has a high charge and discharge capacity and can achieve high output. Currently, it is mainly used as a power source for portable electronic devices, notebook computers, and electric vehicles, and smaller and lighter secondary batteries are being pursued. In particular, in automotive applications, it is necessary to perform charge and discharge at a large current, and the development of a secondary battery having high rate (rate) characteristics capable of high-speed charge and discharge is required. [0003] The positive electrode and the negative electrode of the lithium ion secondary battery have active materials capable of intercalating and deintercalating lithium (Li), respectively. And it operates by moving lithium ions through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/587H01M10/0566H01M10/0568H01M10/0569
CPCH01M4/587H01M10/0525H01M10/0568H01M10/0569H01M2300/0025H01M2300/0028Y02E60/10H01M4/485H01M10/052H01M10/0567H01M2004/027Y02T10/70
Inventor 山田淳夫山田裕贵中垣佳浩河合智之长谷川雄纪间濑浩平合田信弘
Owner THE UNIV OF TOKYO
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