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Cell and method of producing the same

A battery and electronic technology, applied in the manufacture of electrolyte batteries, batteries, secondary batteries, etc., can solve problems such as short-circuit current increase and battery temperature rise

Inactive Publication Date: 2000-06-14
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Such a battery, as mentioned above, when the temperature of the battery rises to a temperature higher than the melting and flowing temperature of the separator due to reasons such as an internal short circuit, a short-circuit current will be generated between the positive electrode and the negative electrode at the part where the separator flows, so There is a problem that the temperature of the battery further rises due to heat generation, and the short-circuit current further increases

Method used

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  • Cell and method of producing the same
  • Cell and method of producing the same
  • Cell and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] (Manufacturing method of positive electrode)

[0080] Electron-conductive material (particles kneaded by carbon black and polyethylene in a ratio of 60:40 parts by weight) with a volume resistivity of 0.2Ω·cm at room temperature and a volume resistivity of 20Ω·cm at 135°C by jet grinding powder) was finely pulverized to obtain a particulate electronic conductive material. As a result of measuring the particle size of the electronic conductive material, the average particle diameter was 1 μm.

[0081] Then, five kinds of positive electrode active materials having different average particle diameters shown in Table 1 were prepared. Then by adding 12 parts by weight of particulate electronically conductive material, 85 parts by weight of positive electrode active material (LiCoO 2 ) and 3 parts by weight of the binder (PVDF) were dispersed in NMP as a dispersion medium and adjusted to obtain 5 positive electrode active material pastes.

[0082] Then, each of the above-me...

Embodiment 2

[0100] (Manufacturing method of positive electrode)

[0101] As in Example 1, a powder of an electronically conductive material having a volume resistivity of 0.2Ω·cm at room temperature and a volume resistivity of 20Ω·cm at 135°C was finely pulverized by jet milling. As a result of particle size measurement of this pulverized electronically conductive material, the average particle diameter was 1 micron.

[0102] Then, five kinds of positive electrode active materials having different average particle diameters shown in Table 1 were prepared.

[0103] First, by dispersing 6 parts by weight of an electronically conductive material with an average particle diameter of 1 micron, 91 parts by weight of five positive electrode active materials, and 3 parts by weight of a binder in NMP as a dispersion medium, and adjusting, Five positive electrode active material pastes with different average particle diameters were obtained.

[0104] This positive electrode active material paste ...

Embodiment 3

[0109] (Manufacturing method of positive electrode)

[0110] Unlike the jet grinding method used in Examples 1 and 2, a ball milling method was used. A powder of an electronically conductive material having a volume specific resistance of 0.2 Ω·cm and a volume specific resistance of 20 Ω·cm at 135°C was pulverized with a ball mill. As a result of particle size measurement of this powder, the average particle diameter was about 9 micrometers.

[0111] Then, five kinds of positive electrode active materials having different average particle diameters shown in Table 1 were prepared. First, by dispersing 6 parts by weight of an electronically conductive material with an average particle diameter of 9 microns, 91 parts by weight of five positive electrode active materials, and 3 parts by weight of a binder in NMP as a dispersion medium, and adjusting, Five kinds of positive electrode active material pastes having different average particle diameters were obtained.

[0112] This ...

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Abstract

Conventional batteries have a problem that, in case the battery temperature should rise to 100 DEG C or higher due to an internal short-circuit, etc., a large short-circuit current develops to generate heat. It follows that the battery temperature further increases, which can result in a further increase of the short-circuit current. Further, some of electrode structures involve reduction in discharge capacity. These problems are solved by a battery in which an electron conductive material (9), being in contact with an active material (8) in an electrode, comprises a conductive filler and a resin so that the electrode may increase its resistivity with a temperature rise, and the ratio of the particle size of the electron conductive material (9) to that of the active material (8) is in a range of from 0.1 to 20.

Description

technical field [0001] The present invention relates to a battery and a manufacturing method thereof, and more specifically, to a high-performance battery and a manufacturing method thereof that ensure safety by suppressing a temperature rise due to a short circuit or the like and maintain a high discharge capacity. technical background [0002] In recent years, along with the development of electronic equipment, the increase in capacity and power density of batteries used as power sources has been progressing. Lithium-ion secondary batteries are attracting attention as batteries satisfying these requirements. The high energy density of the lithium ion secondary battery is an advantage, but the disadvantage is that it needs to use a non-aqueous electrolytic solution and needs to take sufficient measures for safety. [0003] In the past, as a safety measure, people have proposed a plan: a PTC device is installed inside the battery to release the rise in internal pressure wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M6/50H01M10/05H01M10/058H01M10/42
CPCH01M4/624H01M10/4235H01M10/052H01M4/02H01M2200/106Y10T29/49108Y02E60/10Y02P70/50
Inventor 西村隆吉濑万希子吉冈省二荒金淳漆畑广明盐田久相原茂竹村大吾
Owner MITSUBISHI ELECTRIC CORP