Porous dielectric particle, electrode for lithium ion secondary battery, and lithium ion secondary battery

A secondary battery, dielectric technology, applied in the field of lithium ion secondary batteries, can solve the problems of reduced lithium ion conductivity, increased internal resistance, insufficient amount of electrolyte, etc.

Pending Publication Date: 2021-09-10
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the conductivity of lithium ions decreases and the internal resistance increases
[0005] In addition, lithium-ion secondary batteries generally tend to have lower output characteristics due to repeated charging and discharging.
The reason for this is that the electrolytic solution is decomposed due to repeated charging and discharging, and a passivation film is formed on the electrode, so that the internal resistance gradually increases, and the amount of the electrolytic solution is insufficient.

Method used

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  • Porous dielectric particle, electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Porous dielectric particle, electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Porous dielectric particle, electrode for lithium ion secondary battery, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9、 comparative example 1～4

[0224] [making of positive electrode]

[0225] Mix porous dielectric particles or dielectric oxide particles, acetylene black (AB) as a conductive additive, and polyvinylidene fluoride as a binder with the composition shown in Table 1 to Table 3, using a self-rotating revolving mixer. Ethylene (PVDF), N-methyl-2-pyrrolidone (NMP) as a solvent, thereby obtaining a premixed slurry. Next, NCM622 as the positive electrode active material and the pre-mixed slurry were mixed so as to have the compositions shown in Tables 1 to 3, and dispersed using a planetary mixer to obtain a positive electrode paste.

[0226] The obtained positive electrode paste was coated on one side of an aluminum current collector with a thickness of 15 μm, and after drying in a vacuum at 120° C. for 10 minutes, it was pressed with a linear pressure of 1 t / cm by a roller press, and further , and dried in a vacuum at 120° C., thereby producing a positive electrode for a lithium ion secondary battery.

[0227...

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Abstract

To provide a porous dielectric particle capable of achieving a lithium ion secondary battery having a high volumetric energy density, a high output, and being scarcely deteriorated in the output property even after charge and discharge are repeated, an electrode for a lithium ion secondary battery including the porous dielectric particle, and a lithium ion secondary battery using the electrode for a lithium ion secondary battery. A porous dielectric oxide is used, and this is dispersed and disposed in gaps between active material particles of an electrode. Specifically, as a particle to be blended in an electrode of a lithium ion secondary battery including an electrolytic solution, porous dielectric particles in which at least a part of a surface of porous core particles is coated with dielectric oxide is used.

Description

technical field [0001] The present invention relates to a porous dielectric particle, an electrode for a lithium ion secondary battery containing the porous dielectric particle, and a lithium ion secondary battery obtained by using the electrode for a lithium ion secondary battery. Battery. Background technique [0002] In the past, lithium ion secondary batteries have been widely used as secondary batteries having high energy density. A lithium ion secondary battery using a liquid as an electrolyte has a structure in which a separator is interposed between a positive electrode and a negative electrode and filled with a liquid electrolyte (electrolyte solution). [0003] Lithium ion secondary batteries have various requirements depending on applications. For example, when used in automobiles, it is desired to have a battery with a high volumetric energy density and a low decrease in output characteristics even if it is repeatedly charged and discharged. [0004] Here, for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/131H01M4/133H01M4/134H01M4/136H01M10/0525
CPCH01M4/62H01M4/628H01M4/131H01M4/136H01M4/13H01M4/134H01M4/133H01M10/0525Y02E60/10H01M4/485H01M2004/027H01M2004/028
Inventor 西面和希中川嵩士永地佑华藤野健
Owner HONDA MOTOR CO LTD
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