Lithium ion secondary battery

A secondary battery, lithium ion technology, applied in secondary batteries, lithium storage batteries, batteries, etc., can solve problems such as battery performance degradation, and achieve the effect of improving life characteristics

Active Publication Date: 2020-04-24
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Correspondingly, lithium-ion secondary batteries with high energy density and good life characteristics are required, but in batteries with high energy density, degradation of battery performance due to decomposition of the electrolyte solvent becomes a problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2 and comparative example 1～5

[0148] (positive electrode)

[0149] Will Li 1.15 Ni 0.3 mn 0.55 o 2 , spherical carbon, flake carbon, and polyvinylidene fluoride (PVdF) were uniformly mixed to prepare a positive electrode mixture. Here, the weight ratio of each component in the positive electrode mixture is set as Li 1.15 Ni 0.3 mn 0.55 o 2 : Spherical carbon: Flake carbon: PVdF=93:3:1:3. The prepared positive electrode mixture was dispersed in N-methyl-2-pyrrolidone (NMP) to prepare positive electrode slurry. The positive electrode slurry is evenly coated on the aluminum foil used as the positive electrode current collector, dried at 120°C, and further pressed to obtain a positive electrode with a weight per unit area of ​​23.8g / cm 2 , Positive electrode density 3.0g / cm 3 positive pole.

[0150] (negative electrode)

[0151] 50% carbon-coated silicon oxide (SiOC) with a particle size of 5 μm (weight ratio is as follows. Coated carbon: silicon oxide = 5:95), fibrous carbon, and polyacrylic acid ...

Embodiment 3～4 and comparative example 6

[0166] (positive electrode)

[0167] Will Li 1.15 Ni 0.3 mn 0.55 o 2 , spherical carbon, flaky carbon, and polyvinylidene fluoride (PVdF) were uniformly mixed to prepare a positive electrode mixture. Here, the weight ratio of each component in the positive electrode mixture is set as Li 1.15 Ni 0.3 mn 0.55 o 2 : Spherical carbon: Flake carbon: PVdF=93:3:1:3. The prepared positive electrode mixture was dispersed in N-methyl-2-pyrrolidone (NMP) to prepare positive electrode slurry. The positive electrode slurry is evenly coated on the aluminum foil used as the positive electrode current collector, dried at 120°C, and further pressed to obtain a positive electrode with a weight per unit area of ​​23.8g / cm 2 , Positive electrode density 3.0g / cm 3 positive pole.

[0168] (negative electrode)

[0169] 50% carbon-coated silicon oxide (SiOC) with a particle size of 5 μm (weight ratio is as follows. Coated carbon: silicon oxide = 5:95), spherical carbon, and polyacrylic aci...

Embodiment 5～11 and comparative example 7

[0181] The preparation method of the electrolyte is the same as in Example 3, and the components are as listed in Table 3. In battery evaluation, the current value of constant current charging was set to 0.3C, the constant voltage charging was not performed, the current value of constant current discharge was set to 0.3C, and the number of cycles was set to 150. Other than that, batteries were fabricated and evaluated in the same manner as in Example 3. From the obtained results, the capacity retention rate and the resistance increase rate were calculated. The results are described in Table 3.

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Abstract

The purpose of the present invention is to provide a lithium ion secondary battery which has further improved service life characteristics. A lithium ion secondary battery according to the present invention is characterized by comprising: a positive electrode which contains a positive electrode active material that operates at 4.5 V or higher with respect to lithium; and an electrolyte solution which contains a cyclic sulfonic acid ester, LiN(FSO2)2, and an electrolyte solution solvent that contains a fluorinated ether.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery, a method for producing the same, and a vehicle equipped with the lithium ion secondary battery. Background technique [0002] Lithium ion secondary batteries are used in various applications. Accordingly, lithium ion secondary batteries with high energy density and good life characteristics are required, but in batteries with high energy density, degradation of battery performance due to decomposition of electrolyte solvents becomes a problem. Therefore, an electrolytic solution solvent with high durability is required. [0003] Known LiN(FSO 2 ) 2 It reacts with the positive electrode and / or the negative electrode to form a coating having an effect of inhibiting the decomposition of the electrolytic solution on the surface of the electrode. Therefore, in order to improve the life characteristics of the battery, LiN(FSO 2 ) 2 added to the electrolyte. In Patent Documents 1 and 2, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/505H01M4/525H01M10/0567H01M10/0568H01M10/0569H01M10/0585
CPCH01M4/505H01M4/525H01M10/0567H01M10/0569Y02E60/10C07D327/00H01M10/0525H01M2300/0034H01M2300/0037H01M2300/004Y02P70/50H01M4/386H01M10/0568H01M2220/20H01M2300/0091
Inventor 长谷川卓哉
Owner NEC CORP
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