Sumitomo Chemical Company, Limited

Chikara Murakami

Toshihiko Ogata

Kosuke Kurakane

Ichiro Arise

Chikae Yoshimaru

Junji Suzuki

Hiroki Hashiwaki

Takahiro Okugawa

Eiko Kashiwazaki

Yutaka Suzuki

Tomoaki Ozeki

Daizaburo Yashiki

Taketsugu Yamamoto

Jun-ichi Kageura

Hiroshi Inukai

Syusaku Hara

Takahiro Matsuo

Hidekazu Yoshida

Maiko Saka

Jun-Ichi Kageura

Hideaki Nakajima

Takuya Kadowaki

Shigekazu Ohmori

Daisuke Nakaji

Provided is a solid electrolyte-containing layer capable of preventing a short circuit caused by the formation of a dendrite. A solid electrolyte-containing layers () in accordance with an aspect of the present invention includes (i) an inorganic solid electrolyte (), (ii) a heat-resistant resin (), and (iii) at least one selected from the group consisting of an ionic liquid, a mixture of an ionic liquid and a lithium salt, and a polymer electrolyte.

Solid electrolyte-containing layer

The present invention provides a positive electrode active material for an all-solid-state lithium-ion battery, an electrode, and an all-solid-state lithium-ion battery capable of smoothly exchanging lithium ions with a solid electrolyte at a positive electrode and improving battery performance. A positive electrode active material for an all-solid-state lithium-ion battery formed of particles includes crystals of a lithium metal composite oxide, in which the lithium metal composite oxide has a layered structure and contains at least Li and a transition metal, and the particles have an average crush strength of more than 50 MPa and satisfy Expression (1).1.0 &#x3bc;m&#x2264;&#x2003;&#x2003;(1)

Positive electrode active material for all-solid-state lithium-ion battery, electrode, and all-solid-state lithium-ion battery

The present invention provides a nonaqueous electrolyte secondary battery in which a decrease in discharge capacity after a charge-discharge cycle is reduced. The nonaqueous electrolyte secondary battery in accordance with an aspect of the present invention includes (i) a positive electrode plate and a negative electrode plate whose results of a scratch test carried out in the TD and the MD fall within predetermined ranges, (ii) a nonaqueous electrolyte secondary battery separator that includes a porous film whose temperature rise ending period with respect to a resin amount per unit area at irradiation with microwave falls within a predetermined range, and (iii) a porous layer that contains an &#x3b1;-form polyvinylidene fluoride-based resin of a polyvinylidene fluoride-based resin at a predetermined proportion. The porous layer is arranged between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate.

Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery including: a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; a positive electrode plate whose active material layer is not peeled from the positive electrode plate until the positive electrode plate is bent 130 or more times; and a negative electrode plate whose active material layer is not peeled from the negative electrode plate until the negative electrode plate is bent 1650 or more times, wherein: diethyl carbonate dropped on the polyolefin porous film diminishes at a rate of 15 sec/mg to 21 sec/mg; the diethyl carbonate has a spot diameter of not less than 20 mm 10 seconds after the diethyl carbonate was dropped on the polyolefin porous film; and the polyvinylidene fluoride-based resin contains an &#x3b1;-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

A nonaqueous electrolyte secondary battery which satisfies four requirements is provided. A porous layer contains &#x3b1;-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol % with respect to 100 mol % of a total amount of (i) the &#x3b1;-form polyvinylidene fluoride-based resin and (ii) &#x3b2;-form polyvinylidene fluoride-based resin. A porous film has a temperature rise ending period of 2.9 sec&#xb7;m/g to 5.7 sec&#xb7;m/g with respect to an amount of a resin per unit area when the porous film is impregnated with N-methylpyrrolidone containing water in an amount of 3% by weight and then (ii) irradiated, at an output of 1,800 W, with a microwave having a frequency of 2,455 MHz. A positive electrode plate has a capacitance of 1 nF to 1000 nF per measurement area of 900 mm. A negative electrode plate has a capacitance of 4 nF to 8500 nF per measurement area of 900 mm.

A nonaqueous electrolyte secondary battery including: a nonaqueous electrolyte secondary battery separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; a positive electrode plate having a capacitance falling within a specific range; and a negative electrode plate having a capacitance falling within a specific range, wherein: the polyolefin porous film has a given rate of diminution of diethyl carbonate and a given spot diameter of the diethyl carbonate; the porous layer is provided between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate; and the polyvinylidene fluoride-based resin contained in the porous layer contains an &#x3b1;-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

A laminated separator for a nonaqueous electrolyte secondary battery, (i) includes a porous film and a porous layer containing a polyvinylidene fluoride-based resin and (ii) has an excellent rate characteristic. The laminated separator includes the porous film containing a polyolefin-based resin as a main component and the porous layer containing the polyvinylidene fluoride-based resin, in which a surface of the porous layer has a 60-degree specular gloss of 3% to 26%.

Method of producing laminated separator for nonaqueous electrolyte secondary battery

With a nonaqueous electrolyte secondary battery separator having a radical concentration of 5000&#xd7;10spins/mg to 90000&#xd7;10spins/mg, wherein the concentration is calculated from a peak at a g-value of not less than 2.010 in an electron spin resonance spectrum obtained through electron spin resonance analysis using a microwave having a frequency of 9.4 GHz, it is possible to provide a nonaqueous electrolyte secondary battery having a high battery resistance decreasing rate before and after battery formation.

Nonaqueous electrolyte secondary battery separator

A nonaqueous electrolyte secondary battery includes: a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; a positive electrode plate; and a negative electrode plate, wherein a sum of interface barrier energies being a predetermined value, the polyolefin porous film having a puncture strength of a predetermined value, the value represented by Formula (1) below being not less than 0.00 and not more than 0.54,|1&#x2212;&#x2003;&#x2003;Formula (1),and the polyvinylidene fluoride-based resin containing an &#x3b1;-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

As a nonaqueous electrolyte secondary battery whose battery performance is prevented from being deteriorated by charge and discharge, provided is a nonaqueous electrolyte secondary battery including: a nonaqueous electrolyte secondary battery separator having ion permeability barrier energy of not less than 300 J/mol/&#x3bc;m and not more than 900 J/mol/&#x3bc;m per unit film thickness; and a nonaqueous electrolyte containing a given additive in an amount of not less than 0.5 ppm and not more than 300 ppm.

A nonaqueous electrolyte secondary battery in accordance with an embodiment of the present invention includes: a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; and a positive electrode plate and a negative electrode plate each of which has a capacitance in a specific range, the polyolefin porous film having a parameter X of not more than 20, and the polyvinylidene fluoride-based resin containing not less than 35.0 mol % of an &#x3b1;-form polyvinylidene fluoride-based resin.

As a nonaqueous electrolyte secondary battery separator used to produce a nonaqueous electrolyte secondary battery which is low in resistance increasing rate in a case where the nonaqueous electrolyte secondary battery is repeatedly subjected to a charge-discharge cycle, the present invention provides a nonaqueous electrolyte secondary battery separator which includes a polyolefin porous film, the nonaqueous electrolyte secondary battery separator having ion permeability barrier energy of not less than 300 J/mol/&#x3bc;m and not more than 900 J/mol/&#x3bc;m.

Provided is a separator including a first later consisting of a porous polyolefin and a secondary battery utilizing the separator. The first layer exhibits a temperature-increase convergence time equal to or longer than 2.9 s&#xb7;m/g and equal to or shorter than 5.7 s&#xb7;m/g when the first layer is irradiated with a microwave having a frequency of 2455 MHz and an output power of 1800 W after being dipped in N-methylpyrrolidone containing 3 wt % of water. A minimum height of a ball placed over the first layer and having a diameter of 14.3 mm and a weight of 11.9 g is equal to or more than 50 cm and equal to or less than 150 cm, the minimum height causing a split in the first layer when the ball freely falls on the first layer.

Separator and secondary battery including the separator

Provided is a separator capable of suppressing an increase in internal resistance and a decrease in a battery performance. A separator having a first layer consisting of a porous polyolefin and an organic antioxidant and a secondary battery including the separator are provided. The first layer has a parameter X, defined by the following equation, equal to or more than 0 and equal to or less than 20, where MD tan &#x3b4; and TD tan &#x3b4; are respectively a loss tangent in a flow direction and a loss tangent in a width direction which are obtained by a viscoelasticity measurement of the first layer at a temperature of 90&#xb0; C. and a frequency of 10 Hz. A white index of the first layer is equal to or more than 85 and equal to or less than 98.

A nonaqueous electrolyte secondary battery insulating porous layer usable as a member of a nonaqueous electrolyte secondary battery having an excellent cycle characteristic is provided. A nonaqueous electrolyte secondary battery insulating porous layer includes a thermoplastic resin, porosity of the nonaqueous electrolyte secondary battery insulating porous layer being not less than 25% and not more than 80%, and a ratio of a displacement amount of the nonaqueous electrolyte secondary battery insulating porous layer at tenth loading-unloading cycle to a displacement amount of the nonaqueous electrolyte secondary battery insulating porous layer at fiftieth loading-unloading cycle being not less than 100% and less than 115%.

Growing community of inventors

Osaka, Japan

Chikara Murakami