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Lithium ion secondary battery

A secondary battery and lithium ion technology, applied in secondary batteries, secondary battery components, battery electrodes, etc., can solve problems such as deterioration and promotion of battery characteristics, increase the proportion of active materials, prevent the reduction of negative electrode capacity, and improve The effect of battery capacity

Active Publication Date: 2007-10-24
ENVISION AESC ENERGY DEVICES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, for the vapor-grown carbon fiber that is recorded as an active material and a conductive agent, if the interplanar spacing of the [0002] plane is 0.336-0.337nm, the degree of graphitization is high, and it is actually a mixture of carbon materials and graphite, which can inhibit The reduction of the capacity of the negative electrode, but in order to ensure the conductivity, the mixing ratio is 5-30%, which is more, and it may promote the side effects of deteriorating the battery characteristics such as the decomposition of the electrolyte caused by the reaction of the graphite and the electrolyte

Method used

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  • Lithium ion secondary battery

Examples

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Embodiment

[0035] battery production

[0036] Positive electrode production

[0037] A positive electrode active material and a conductivity-imparting agent were mixed and uniformly dispersed in N-methyl-2-pyrrolidone (NMP) in which a binder was dissolved to prepare a slurry. As the positive electrode active material, LiMn is used 2 o 4 , as the conductivity imparting agent, carbon black was used, and as the binder, polyvinylidene fluoride (PVdF) was used. This slurry was coated on an aluminum foil for a current collector with a thickness of 25 μm, and then NMP was evaporated to form a positive electrode layer. The solid content ratio in the positive electrode layer was: positive electrode active material:conductivity imparting agent:binder=80:10:10 (% by mass).

[0038] Production of negative electrode

[0039] For Examples 1 to 11 and Comparative Examples 1 to 10, a carbonaceous material with a volume average particle diameter of 3 μm or less and a moisture absorption value shown ...

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Abstract

The invention provides a lithium ion secondary battery comprising a positive electrode, a negative electrode and an electrolysis solution containing an aprotic solvent having an electrolyte dissolved in it, wherein the negative electrodes uses an amorphous carbon material as a negative electrode active material. The amorphous carbon material has (A) an average particle diameter (median size of 7 mum to 20 mum inclusive as measured by a laser diffraction scattering method and (B) a particle size distribution as measured by a laser diffraction scattering method, in which distribution the ratio of particles of less than 3 mum in diameter is 1% by mass to 10% mass inclusive, and is free of an electrical conducting material.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery, particularly to a lithium ion secondary battery using a negative electrode material that prevents capacity reduction. Background technique [0002] Non-aqueous electrolyte lithium-ion secondary batteries or lithium secondary batteries that use lithium-containing composite oxides for the positive electrode and carbon materials or lithium metal for the negative electrode are used as power sources for mobile phones, notebook computers, etc. because they can achieve high energy density. Furthermore, because it can realize high input and output characteristics, it is attracting attention as a power supply for hybrid vehicles. [0003] In these lithium ion secondary batteries, a negative electrode active material layer is usually used for the negative electrode. It is mixed with a binder to ensure the adhesion between particles. [0004] For example, Japanese Patent No....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M10/40H01M4/02H01M4/38H01M2/02H01M4/133H01M4/587H01M10/05H01M10/0525H01M10/0566
CPCH01M2004/021H01M2004/027H01M10/0525H01M2/0222H01M4/505Y02E60/122H01M4/133Y02T10/7011H01M50/109Y02E60/10H01M4/60H01M10/02Y02T10/70
Inventor 坂内裕沼田达治笠原龙一
Owner ENVISION AESC ENERGY DEVICES LTD
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