Non-aqueous electrolyte secondary cell

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, lithium batteries, etc., can solve problems such as uneven precipitation, electrode fracture, etc., and achieve the effect of inhibiting electrode fracture

Active Publication Date: 2020-04-21
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a lithium secondary battery, there is a problem that due to the expansion of the negative electrode caused by the deposition of lithium metal and the uneven deposition of lithium metal on the surface of the negative electrode, stress is generated in the electrode, and each charge-discharge cycle Stress is repeatedly generated in the electrode, as a result of which the electrode breaks shortly after

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0059] [making of positive electrode]

[0060] Mix a lithium-containing transition metal oxide containing aluminum, nickel, and cobalt, acetylene black (AB) and polyvinylidene fluoride (PVDF) as the positive electrode active material in a mass ratio of 95:2.5:2.5, and then add an appropriate amount of N-methyl -2-pyrrolidone (NMP) and stirring, thus preparing the positive electrode mixture slurry. Next, this positive electrode mixture slurry was applied to both surfaces of a positive electrode current collector formed of aluminum foil, and the coating film was dried. After rolling the coating film with a roll, it was cut into a predetermined electrode size, and a positive electrode in which positive electrode mixture layers were sequentially formed on both surfaces of a positive electrode current collector was fabricated. The molar ratio of lithium to the sum of the transition metals in the lithium-containing transition metal oxide used as the positive electrode active materi...

Embodiment 2

[0068] In the production of the battery, for the strip-shaped positive electrode, negative electrode, and separator, materials with different lengths in the longitudinal direction (winding direction) were used respectively, and the volume of the hollow part was changed. 7250mm 3 A cylindrical battery T2 with a hollow part and a positive electrode capacity α of 3900 mAh.

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Abstract

The non-aqueous electrolyte secondary cell according to the present invention comprises: an electrode body constituted by a positive electrode having a positive electrode active material comprising alithium-containing transition metal oxide, a negative electrode having a negative electrode current collector onto which metallic lithium is deposited during charging, and a separator disposed betweenthe positive electrode and the negative electrode; and a non-aqueous electrolyte. The molar ratio of the total lithium content of the positive electrode and the negative electrode to the transition metal content of the positive electrode is 1.1 or less. During discharging, the positive electrode capacitance alpha (mAh) of the positive electrode and the volume X (mm<3>) of a hollow constituted bya space formed in the center of the electrode body 14 satisfy the relationship 0.5 <= X / alpha <= 4.0.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery, and more specifically, to a lithium secondary battery. Background technique [0002] In addition to ICT fields such as personal computers and smartphones, further increases in the capacity of non-aqueous electrolyte secondary batteries are required in the automotive field and the power storage field. Lithium-ion batteries are mainly used as high-capacity non-aqueous electrolyte secondary batteries. As a lithium ion battery, for example, a configuration using a lithium-containing transition metal oxide as the positive electrode and a negative electrode active material composed of graphite, a silicon compound, etc. as the negative electrode is known, but this configuration is gradually reaching a limit in terms of high capacity. [0003] Patent Document 1 discloses a lithium battery in which a part of the positive electrode is composed of a lithium transition metal oxide having...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M2/02H01M4/40H01M4/525H01M4/66H01M10/052H01M50/107
CPCH01M10/052H01M10/0587Y02E60/10Y02P70/50H01M4/134H01M2004/027H01M4/0447H01M4/1395H01M4/382H01M4/661H01M10/446H01M2010/4292H01M50/107H01M4/131H01M4/525H01M10/0525H01M2004/028
Inventor 原田朋宏南博之
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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