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Lithium-ion secondary battery

一种二次电池、锂离子的技术，应用在二次电池、锂蓄电池、电池电极等方向，能够解决燃烧加速等问题，达到移动经路坚固、维持高率放电特性的效果

Inactive Publication Date: 2016-06-01
NTT FACILITIES INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, oxygen generated by the thermal decomposition reaction of the positive electrode active material may further accelerate the combustion of battery constituent materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In Example 1, as shown in Table 1 below, a phosphazene compound (manufactured by Bridgestone Corporation, trade name Phoslight (registered trademark) , liquid) of 15% by volume. 4% by mass of a phosphazene compound (manufactured by Bridgestone Corporation, trade name Phoslight (registered trademark), solid state) of a flame retardant blended in the positive electrode mixture, lithium manganate powder (average secondary particle size) of the positive electrode active material diameter 25 μm), 5 mass % of flake graphite, and 7 mass % of PVDF. The mode value of the pore diameter of the positive electrode mixture was measured using a mercury porosimeter (manufactured by Shimadzu Corporation, Autopore IV9520), and a lithium ion secondary battery 1 in which the mode value of the pore diameter of the positive electrode mixture was 0.5 μm was produced. A plurality of lithium ion secondary batteries having different mode values ​​of the pore diameters of the positive electrode ...

Embodiment 2

[0041] As shown in table 1, in embodiment 2, use the concentration of lithium salt to be the non-aqueous electrolytic solution of 1.5M, in addition, operate in the same way as embodiment 1, the mode value of the pore diameter of making positive electrode mixture is different multiple Li-ion secondary batteries. The mode values ​​of the pore diameters of the positive electrode mixtures of these lithium ion secondary batteries were 0.5 μm, 0.6 μm, 0.9 μm, 1.3 μm, 1.6 μm, 2.0 μm, 2.3 μm, and 3.2 μm, respectively.

Embodiment 3

[0043] As shown in Table 1, in Example 3, a non-aqueous electrolyte solution with a lithium salt concentration of 1.5M was used, and 2% by mass of the phosphazene compound was blended in the positive electrode mixture. In addition, it was the same as in Example 1. In this operation, a plurality of lithium ion secondary batteries having different mode values ​​of pore diameters of positive electrode mixtures were manufactured. The mode values ​​of the pore diameters of the positive electrode mixtures of these lithium ion secondary batteries were 0.5 μm, 1.0 μm, 1.3 μm, 1.9 μm, 2.0 μm, 2.2 μm, 2.8 μm, and 3.0 μm, respectively.

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Abstract

The present invention provides a lithium ion secondary battery capable of ensuring safety when the battery is abnormal and suppressing deterioration of high-rate discharge characteristics. The lithium ion secondary battery (1) has a positive electrode plate (2) on which a positive electrode mixture containing a positive electrode active material is formed on a current collector, and a negative electrode plate (3) on which a negative electrode mixture containing a negative electrode active material is formed on a current collector. An electrode group (5) in which a porous separator (4) is wound. A flame retardant is blended in the positive electrode mixture of the positive electrode plate (2), and the mode value of the diameter of pores formed in the positive electrode mixture measured by a mercury porosimeter is set in the range of 0.5 to 2.0 μm. When charging and discharging, the movement path of lithium ions and the movement path of electrons can be ensured at the same time.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery, in particular to an electrode group in which a positive electrode plate having a positive electrode mixture containing a positive electrode active material and a negative electrode plate having a negative electrode mixture containing a negative electrode active material are disposed through a separator and soaked in an organic solvent for mixing. A lithium-ion secondary battery containing a non-aqueous electrolyte solution of a lithium salt and housed in a battery container. Background technique [0002] Lithium-ion secondary batteries have high energy density, so they can be reduced in size and weight as power sources. Therefore, it is also used not only as a small power supply for portable use but also as a power supply for electric vehicles. In addition, it is also used for the effective utilization of natural energy such as sunlight and wind power, and the balance of power usage, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/505H01M4/62H01M10/052H01M10/0568
CPCH01M4/62H01M10/0525H01M2004/021H01M4/131H01M4/505H01M4/628H01M10/4235Y02E60/10H01M10/0568
Inventor 辻川知伸荒川正泰宫本佳树林晃司中原全基
Owner NTT FACILITIES INC
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