Lithium-ion secondary cell
A secondary battery and lithium ion technology, which is applied in the direction of secondary batteries, battery electrodes, battery components, etc., can solve problems such as lithium ion precipitation, achieve the effect of suppressing the rise of battery temperature and maintaining safety
Active Publication Date: 2018-03-27
ENVISION AESC JAPAN LTD
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- Description
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- Application Information
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Problems solved by technology
However, since there is a limit to the capacity of lithium ions that can be accommodated in the negative electrode (that is, the capacity of the negative electrode), there is a concern that lithium ions that are not accommodated in the negative electrode will be precipitated.
Method used
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Embodiment
[0037]
[0038] Add surface-coated natural graphite powder (specific capacity: 390mAh / g) as a negative electrode active material, carbon black powder as a conductive additive, and polycarbonate as a binder resin to ion-exchanged water at a ratio of solid content of 94:6. Vinylidene fluoride resin (PVDF, KUREHA W#7200, Kureha Battery Materials Japan Co., Ltd.) was stirred, and these materials were uniformly dispersed in water to prepare a slurry. The obtained slurry was coated on an 8 μm thick copper foil serving as a negative electrode current collector. Next, the electrode was heated at 125° C. for 10 minutes to evaporate water to form a negative electrode active material layer. Furthermore, the negative electrode active material layer was pressed so that the porosity was 35%, and the negative electrode in which the negative electrode active material layer was coated on one side of the negative electrode current collector was produced. This negative electrode is described ...
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Abstract
The lithium-ion secondary cell includes a power generation element that includes a positive electrode in which a positive electrode active material layer is disposed on a positive electrode collector,a negative electrode in which a negative electrode active material layer is disposed on a negative electrode collector, a separator, and a liquid electrolyte. The negative electrode active material layer contains graphite. The invention is characterized in that when a lithium-ion secondary cell according to an embodiment is charged to 5V, the excess ratio, which is the ratio between the positiveelectrode specific capacity and the negative electrode specific capacity, is equal to or greater than 1, and the heat shrinkage of the separator is 13% or less. The present invention provides a lithium-ion secondary cell with which it is possible to prevent generation of heat, which may occur when the cell is overcharged, and maintain safety.
Description
technical field [0001] The invention relates to a nonaqueous electrolyte battery, in particular to a lithium ion secondary battery. Background technique [0002] Non-aqueous electrolyte batteries are being put into practical use as batteries for automobiles including hybrid cars, electric cars, and the like. Lithium-ion secondary batteries are used as such batteries for vehicle power supplies. Lithium-ion secondary batteries have been increased in capacity as development progresses, and along with this, it is necessary to ensure safety. [0003] It is considered that a battery that has been further charged from a fully charged lithium ion secondary battery is usually in an overcharged state, and it can be said that it is in an unstable state. When a lithium ion secondary battery using a lithium composite oxide having a layered crystal structure with high energy density is placed as a positive electrode material in an overcharged state, lithium ions can move from the positi...
Claims
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IPC IPC(8): H01M10/0525H01M2/16H01M4/505H01M4/525H01M10/0566H01M50/417H01M50/443H01M50/489
CPCH01M4/505H01M4/525H01M4/131H01M4/133H01M2004/027H01M2004/028H01M2010/4292H01M10/0525Y02E60/10H01M50/417H01M10/486H01M50/443H01M50/489H01M4/661H01M10/0567
Inventor 小原健児须贺创平篠原功一堀内俊宏青柳成则西山淳子
Owner ENVISION AESC JAPAN LTD