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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte, secondary batteries, etc., can solve the problems affecting battery cycle performance, storage performance, charge and discharge efficiency, safety, etc.

Active Publication Date: 2018-03-27
ENVISION AESC JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that the SEI film formed by such additives will greatly affect the cycle performance, storage performance, charge and discharge efficiency, and safety of the battery.

Method used

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Experimental program
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Effect test

Embodiment

[0158] Hereinafter, although an Example and a comparative example are used and it demonstrates in more detail, this invention is not limited at all by the following Example. In addition, unless otherwise stated, the following experiment was performed at 25 degreeC.

[0159] "Making of Laminated Batteries"

reference example 1

[0161] (1) Production of positive electrode

[0162] 95% by mass of NMC composite oxide (LiNi 0.5 mn 0.3 co 0.2 o 2 , average secondary particle size (D50) = 10 μm), 2% by mass of conductive carbon black (super-P) as a conductive additive, 3% by mass of polyvinylidene fluoride (PVdF) as a binder, and an appropriate amount N-methyl-2-pyrrolidone (NMP) used as a slurry viscosity adjusting solvent was mixed to prepare a positive electrode active material slurry.

[0163] The obtained positive electrode active material slurry was coated on both sides of an aluminum foil (thickness: 20 μm) as a positive electrode current collector, dried at 120° C. for 3 minutes, and then compression molded with a roll press to produce one side of the positive electrode active material layer. Coating amount (excluding current collector) is 18mg / cm 2 , The density of the positive electrode active material layer is 3.1g / cm 3 positive pole.

[0164] (3) Production of negative electrode

[0165...

reference example 2

[0174] As the negative electrode active material, natural graphite (with an amorphous coating layer on the surface, average particle size (D50) = 10 μm, BET specific surface area (SSA) = 3.5 m) was used instead. 2 / g), except that, the laminated battery of Reference Example 2 was produced by the same method as that of Reference Example 1 above. In addition, here, the negative electrode active material used is also called "active material (2)".

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Abstract

A nonaqueous electrolyte secondary battery, wherein: an electrolyte is configured to contain an electrolyte salt, a nonaqueous solvent into which the electrolyte salt is able to be dissolved, a firstadditive selected from among specific oxalate compounds and disulfonic acid ester compounds, and a second additive that has a reduction potential lower than the reduction potential of the first additive and is selected from among vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propene sultone, succinonitrile and adiponitrile;and 0.21 <= A * L / SSA <= 0.69 and 0.51 <= B * L / SSA <= 1.5 are satisfied, where SSA (m2 / g) is the BET specific area of the negative electrode active material, L is the ratio (liquid coefficient) of the electrolyte amount to the total void volume of the positive electrode, the negative electrode and the separator, A (mass%) is the ratio of the addition amount of the first additive to the total amount of the nonaqueous solvent and the electrolyte salt in the electrolyte, and B (mass%) is the ratio of the addition amount of the second additive to the total amount of the nonaqueous solvent and theelectrolyte salt in the electrolyte.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery. Background technique [0002] Nonaqueous electrolyte secondary batteries, especially lithium ion secondary batteries, are widely used as power sources for mobile devices due to their high energy density, high durability, charge and discharge efficiency, and the like. [0003] In recent years, against the background of vigorous development of the environmental protection movement, the use of lithium-ion secondary batteries has expanded to large-scale system power supplies such as electric vehicles and stationary power storage systems. Batteries used for these power sources are required to increase the size of batteries, improve battery characteristics such as higher energy density, and high production efficiency to economically realize these battery performances. [0004] As far as the lithium-ion secondary battery is concerned, when the battery is repeatedly charged and disch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0567H01M50/105H01M50/437H01M50/463H01M50/489
CPCH01M10/0567H01M10/0568H01M2300/0025H01M10/0525Y02E60/10H01M50/463H01M50/105H01M50/489H01M50/437H01M10/052Y02T10/70H01M50/44H01M10/0562H01M2004/027H01M2004/028
Inventor 小原健児胁宪尚新田芳明青柳成则
Owner ENVISION AESC JAPAN LTD
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