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US 10,312,491 B2Granted
Separator and battery
AssigneeMurata Manufacturing Co., Ltd.
InventorsKazuki Chiba, Atsushi Kajita, Yukako Teshima, Masatake Hayashi
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Abstract
A separator includes a first layer that has a first principal face and a second principal face, and a second layer that is formed on at least one of the first principal face and the second principal face. The first layer is a microporous membrane including a first polymer resin, and the second layer is a microporous membrane including inorganic particles having an electrically insulating property and a second polymer resin.
Claims24
A separator comprising:
- a first resin layer having a first principal face and a second principal face;
- and
- a second resin layer provided on at least one of the first principal face and the second principal face;
- wherein the second resin layer includes inorganic particles, and a volume fraction of the inorganic particles in the second resin layer is equal to or greater than 60 vol % and equal to or lower than 90 vol %,
- wherein an average particle diameter D20 of the inorganic particles is larger than an average pore diameter of pores opening onto a surface of the first resin layer, and the average pore diameter of the pores ranges from 0.03 μm to 0.10 μm,
- wherein an average particle diameter D20 of the inorganic particles of the second resin layer ranges from 0.13 μm to 0.21 μm,
- wherein the average particle diameter D90 of the inorganic particles of the second resin layer ranges from 2.00 μm to 5.00 μm and is greater than the average particle diameter D20,
- wherein the second resin layer includes one or more of materials selected from the group consisting of polyvinylidene fluoride, polyhexafluoropropylene, polysiloxane, polyacrylic acid, polymethacrylate and nitrile butadiene rubber,
- wherein a difference between air permeability of the separator and air permeability of the first layer is equal to or less than 60 sec/100 ml, and
- wherein the second resin layer comprises fibrils having the average diameter of equal to or less than 1 μm.
7 more elements
A battery comprising:
- a positive electrode;
- a negative electrode;
- an electrolyte;
- and
- a separator,
- wherein the separator includes
- a first resin layer having a first principal face and a second principal face and
- a second resin layer provided on at least one of the first principal face and the second principal face;
- wherein the second resin layer includes inorganic particles, and a volume fraction of the inorganic particles in the second resin layer is equal to or greater than 60 vol % and equal to or lower than 90 vol %,
- wherein an average particle diameter D20 of the inorganic particles is larger than an average pore diameter of pores opening onto a surface of the first resin layer, and the average pore diameter of the pores ranges from 0.03 μm to 0.10 μm,
- wherein an average particle diameter D20 of the inorganic particles of the second resin layer ranges from 0.13 μm to 0.21 μm,
- wherein the average particle diameter D90 of the inorganic particles of the second resin layer ranges from 2.00 μm to 5.00 μm and is greater than the average particle diameter D20,
- wherein the second resin layer includes one or more of materials selected from the group consisting of polyvinylidene fluoride, polyhexafluoropropylene, polysiloxane, polyacrylic acid, polymethacrylate and nitrile butadiene rubber,
- wherein a difference between air permeability of the separator and air permeability of the first layer is equal to or less than 60 sec/100 ml, and
- wherein the second resin layer comprises fibrils having the average diameter of equal to or less than 1 μm.
12 more elements
Dependencies are inferred from the claim text.