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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of low initial charge and discharge efficiency, and achieve high initial charge and discharge efficiency, gas The effect of reducing the amount of production and excellent safety

Inactive Publication Date: 2012-05-16
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] However, since the initial charge-discharge efficiency of a battery using silicon oxide as the negative electrode material is low, in Patent Document 10, a lithium (Li) foil is attached to the fabricated negative electrode sheet to fill up the part of the irreversible capacity
However, this method has the following problems, that is, the process of pasting the Li foil or the treatment of the pasted electrode must be carried out in an extremely dry gas environment, so further improvement is necessary.

Method used

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  • Non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088]

[0089] Mix 90% by mass of silicon nanoparticles with an average particle size of 5 μm and a carbon coverage of 15% by mass dispersed in silicon oxide, and 10% by mass of polyimide, then add N-methylpyrrolidone, Make a slurry.

[0090] The slurry was coated on both sides of a copper foil with a thickness of 11 μm, dried at 100° C. for 30 minutes, and then the electrode was press-formed by a roll press machine, and the electrode was vacuum-dried at 400° C. for 2 hours. Thereafter, it was cut into a size of 5.8 cm in length and 75 cm in width, and used as a negative electrode. At this time, cutting was performed so that both ends of the electrode had portions not coated with the slurry having a width of 2 cm and a length of 6 cm.

[0091] Next, 94% by mass of lithium cobaltate, 3% by mass of acetylene black, and 3% by mass of polyvinylidene fluoride were mixed, and then N-methylpyrrolidone was added to make a slurry, and the slurry was coated on an aluminum foil with ...

Embodiment 2

[0105] Batteries were fabricated and evaluated by the following methods.

[0106] As a non-aqueous electrolytic solution, LiBOB was dissolved in a mixed solution of ethylene carbonate:diethyl carbonate=1:1 (volume ratio) to make it 10% by mass, and was prepared. In addition, in order to prevent moisture in the atmosphere from diffusing into the electrolyte solution, the work of preparing the electrolyte solution is performed in a glove box filled with argon gas.

[0107] Then, a cylindrical lithium-ion secondary battery for evaluation was produced in the same manner as in Example 1 using the negative electrode and positive electrode prepared in the same manner as in Example 1, and the prepared non-aqueous electrolyte solution.

[0108] The prepared lithium ion secondary battery was subjected to battery evaluation, acupuncture test, and gas generation test in the same manner as in Example 1. The test results are shown in Table 1.

Embodiment 3

[0110] Batteries were fabricated and evaluated by the following methods.

[0111] As a non-aqueous electrolyte, it is used to make LiPF 6 In a solution having a concentration of 1 mol / L dissolved in a mixed solution of ethylene carbonate:diethyl carbonate=1:1 (volume ratio), LiFOB was dissolved to make it 5% by mass relative to the electrolytic solution. In addition, in order to prevent moisture in the atmosphere from diffusing into the electrolyte solution, the work of preparing the electrolyte solution is performed in a glove box filled with argon gas.

[0112] Then, a cylindrical lithium-ion secondary battery for evaluation was produced in the same manner as in Example 1 using the negative electrode and positive electrode prepared in the same manner as in Example 1, and the prepared non-aqueous electrolyte solution.

[0113] The prepared lithium ion secondary battery was subjected to battery evaluation, acupuncture test, and gas generation test in the same manner as in Exa...

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Abstract

The present invention is a non-aqueous electrolyte secondary battery including at least a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive and negative electrodes being capable of occluding and emitting lithium ions, wherein the negative electrode is composed of particles each having a structure that silicon nanoparticles are dispersed to silicon oxide, each of the particles is coated with a carbon coating, and the non-aqueous electrolyte includes lithium oxalatoborate in the range of 5 to 10 mass %, as the electrolyte. As a result, there is provided a non-aqueous electrolyte secondary battery having high capacity, superior first charge and discharge efficiency, superior cycle performance, and high safety, while a manufacturing method and structure thereof are not complex.

Description

technical field [0001] The invention relates to a non-aqueous electrolyte secondary battery with high capacity, high safety and good cycle characteristics. Background technique [0002] In recent years, with the remarkable development of portable electronic devices, communication devices, and electric vehicles, a high-capacity, high-energy-density non-aqueous electrolytic liquid secondary battery. [0003] The method of using silicon oxide in the negative electrode material of this secondary battery, such as the method reported in Patent Document 1, or the method of covering carbon on the surface of silicon oxide particles reported in Patent Document 2 and Patent Document 3 layer method. However, the above-mentioned conventional methods have improved the charge-discharge capacity and energy density, but the cycle performance is not sufficient, and the characteristics required by the market are still not sufficient, so it is not always satisfactory. Therefore, it is expecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48H01M4/13H01M10/056
CPCH01M10/0567Y02E60/122H01M4/625H01M10/052H01M4/386H01M4/366Y02E60/10H01M4/02H01M4/36H01M10/05H01M10/0568
Inventor 谷口一行宫胁悟山田佳益
Owner SHIN ETSU CHEM IND CO LTD
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