Nonaqueous electrolyte secondary cell

A non-aqueous electrolyte, secondary battery technology, used in non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., can solve problems such as different safety, fire or rupture properties, to ensure electronic conductivity and suppress discharge capacity. the reducing effect of

Inactive Publication Date: 2014-05-07
NTT FACILITIES INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, even if the safety of a portable small battery can be confirmed through an overcharge or nail penetration test, when the same test is performed on a large-capacity battery made of exactly the same material, there may be a risk of fire or rupture. Different serious security concerns

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0042] In Example 1, the amount of the phosphazene compound compounded with the positive electrode mixture was set to be 2.5% by weight relative to the positive electrode active material, and graphite powder (manufactured by Japan Graphite Industry Co., Ltd., trade name JSP, particle size: about 3 μm) and acetylene black (manufactured by Denki Kagaku Kogyo Co., Ltd., trade name HS, particle size: 48 nm) were used as conductive agents. The design capacity of the battery was set to 10 Ah by adjusting the number of laminated electrodes so that the total amount of the positive electrode active material was 130 g (see Table 1). Five types of lithium ion secondary batteries 20 were produced by varying the amount of the conductive agent relative to the amount of the phosphazene compound. The mass ratio of the conductive agent / phosphazene compound was set to 1.0, 1.1, 1.3, 1.5, 1.7.

[0043] Five types of lithium ion secondary batteries 20 were evaluated for high-rate discharge chara...

Embodiment 2）

[0046] In Example 2, the amount of the phosphazene compound compounded in the positive electrode mixture was set to be 5% by weight relative to the positive electrode active material. In the same way as in Example 1, five lithium ion secondary batteries were produced. 20.

[0047] Five types of lithium ion secondary batteries 20 were evaluated in the same manner as in Example 1 for high-rate discharge characteristics. Such as Figure 4 As shown, it was found that as the mass ratio of the conductive agent / solid flame retardant increases, the high-rate discharge characteristics, that is, the capacity ratio of 5C / 0.2C increases. In addition, it has been clarified that by setting the mass ratio of the conductive agent / solid flame retardant in the range of 1.3 to 1.7, high-rate discharge characteristics with a capacity ratio of 80% or more can be obtained. In other words, since the amount of the phosphazene compound was set at 5% by weight relative to the positive electrode activ...

Embodiment 3）

[0049] In Example 3, the amount of the phosphazene compound compounded in the positive electrode mixture was set to be 7.5% by weight relative to the positive electrode active material, and the same operation as in Example 1 was performed except that five kinds of lithium ion batteries were produced. Secondary battery 20.

[0050] About five kinds of lithium ion secondary batteries 20, it carried out similarly to the evaluation of Example 1, and evaluated the high-rate discharge characteristic. Such as Figure 5 As shown, it was found that as the mass ratio of the conductive agent / solid flame retardant increases, the high-rate discharge characteristics, that is, the capacity ratio of 5C / 0.2C increases. In addition, it was clarified that by setting the mass ratio of the conductive agent / solid flame retardant in the range of 1.3 to 1.7, high-rate discharge characteristics with a capacity ratio of basically 80% or more can be obtained. In other words, since the amount of the ph...

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Abstract

Provided is a nonaqueous electrolyte secondary cell with which high-performance discharge properties can be improved while guaranteeing safety. A lithium ion secondary cell has a stacked electrode group (10) sealed inside the laminated film of an outside casing. The stacked electrode group (10) is obtained by alternate stacking of positive pole plates (14) and negative pole plates (15). The positive pole plate (14) is obtained by forming, on both surfaces of an aluminum foil (W1), a positive electrode mix layer (W2) containing a lithium manganese compound oxide as the positive electrode active substance. In addition to the positive electrode active substance, a carbonaceous material as conductor and a phosphagen compound as a flame retarder are uniformly dispersed and mixed in the positive electrode mix layer (W2). The mass ratio of conductor with respect to the mass of flame retarder is adjusted to 1.3 or more. The negative pole plate (15) is obtained by forming, on both surfaces of rolled copper foil, a negative electrode mix layer containing a negative electrode active substance. Electron conductivity of the positive pole plate (14) is ensured by the conductor.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery, in particular to a nonaqueous electrolyte secondary battery with a positive electrode plate having a positive electrode mixture layer and a negative electrode plate having a negative electrode mixture layer containing a negative electrode active material, and a design capacity of 5Ah or more. Background technique [0002] Non-aqueous electrolyte secondary batteries represented by lithium-ion secondary batteries are widely used in consumer portable appliances because of their high voltage, high energy density, and excellent storage performance and low-temperature operation performance. In addition, it is not limited to portable small power supplies, but also power supplies for electric vehicles, household nighttime power storage devices, effective use of natural energy such as sunlight and wind power, balance of power usage, uninterruptible power supply (UPS) and construction ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/505H01M10/052H01M10/0566
CPCH01M4/131H01M4/505H01M4/62H01M4/625H01M4/661H01M10/0525H01M10/0585H01M10/4235Y02E60/10Y02T10/70H01M4/628
Inventor 荒川正泰辻川知伸宫本佳树林晃司
Owner NTT FACILITIES INC
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