Sanyo Electric Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Hiroshi Minami

Taizou Sunano

Atsushi Fukui

Tatsuya Akira

Yoshio Kato

Maruo Kamino

Yasuyuki Kusumoto

Naoki Imachi

Yohei Uchiyama

Norihisa Yamamoto

Katsunobu Sayama

Mariko Torimae

Shin Fujitani

Takeshi Ogasawara

Yoshinori Kida

Hiromasa Yagi

Taisuke Yamamoto

Yasunori Baba

Atsushi Kaiduka

Tadayoshi Tanaka

Tomohiro Harada

Toshio Yanagida

Shouichirou Sawa

Hisaki Tarui

Masaki Deguchi

Shigeki Matsuta

Daizo Jito

Kouhei Tuduki

Noriyuki Tamura

Takuya Sunagawa

Nobuhiro Sakitani

Satoshi Nishitani

Taisuke Asano

Kazunari Yasumura

Shigeru Hanaoka

Mai Yokoi

Kunihiro Iwai

Daisuke Imai

Shoichiro Sawa

A lithium ion battery including a negative electrode having a negative electrode active material layer that contains lithium silicate particles and a binder. The lithium silicate particles include composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, wherein a carbon material is present inside the composite particles, and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%. The binder includes at least a first resin, wherein the first resin is at least cue selected from the group consisting of polyacrylic acid, a polyacrylic acid salt, and their derivatives. The first resin is contained in an amount of 2 mass % or less in the negative electrode active material layer.

Lithium ion battery

Provided is an electrode treat rent method comprising a peeling step that involves grind ng, with a grinding means, an electrode in which an electrode mixture is held on a collector, and peeling the electrode mixture from the collector, the electrode treatment method Characterized in that the grinding means has a first member (3) that has a grinding surface and a second member (4) that has a grinding surface, and the first member (3) and the second member (4) are disposed so that the grinding surfaces of the first member (3) and the second member (4) face each other and a space for grinding the electrode is formed between the members, and at least one among the first member (3) and the second member (4) is a grinder that rotates around the direction in which the grinding surfaces face each other and which serves as the rotational axial direction.

Electrode treatment method

A positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode includes a negative electrode material, a binder, and a thickener, and the negative electrode material includes a lithium silicate phase, and Si particles dispersed in the lithium silicate phase. The ratio of the Si particles in the negative electrode material is 30 mass % or more. The binder includes a poly(meth)acrylic acid, the thickener includes a carboxyalkyl cellulose, and the amount of the poly(meth)acrylic acid relative to 100 parts by mass of the negative electrode material is 0.1 parts by mass or more and 5 parts by mass or less. The non-aqueous electrolyte includes a lithium salt, a non-aqueous solvent, and an acid that exhibits a pKa of 1 to 30 in water at 25° C. The non-aqueous electrolyte secondary battery can suppress the generation of gas during high-temperature storage, and secure excellent cycle characteristics.

Non-aqueous electrolyte secondary battery

The non-aqueous electrolyte secondary cell according to the present invention comprises: an electrode body constituted by a positive electrode including a positive electrode active material comprising a lithium-containing transition metal oxide, a negative electrode including a negative electrode current collector onto which metallic lithium is deposited during charging, and a separator disposed between the 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 &#x3b1;(mAh) of the positive electrode and the volume X (mm) of a hollow constituted by a space formed in the center of the electrode bodysatisfy the relationship 0.5&#x2264;X/&#x3b1;&#x2264;4.0.

Non-aqueous electrolyte secondary cell

The nonaqueous electrolyte secondary battery comprises the following: a positive electrode including a positive electrode active material that includes a lithium-containing transition metal oxide, a negative electrode including a negative electrode current collector wherein lithium metal deposits on the negative electrode current collector during charging, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The molar ratio of the total amount of lithium held by the positive electrode and the negative electrode to the amount of transition metal in the positive electrode is not more than 1.1. In addition, in the discharged state, a space layer is present between the negative electrode and the separator, and the positive electrode capacity per unit area, &#x3b1; (mAh/cm), of the positive electrode and the average in thickness, X (&#x3bc;m), of the space layersatisfy 0.05&#x2264;&#x3b1;/X&#x2264;0.2.

Nonaqueous electrolyte secondary battery and method for producing same

A non-aqueous electrolyte secondary battery includes: an electrode group including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; a tape for securing at least a wound end of the electrode group; and a non-aqueous electrolyte. The negative electrode, at least in a charged state, includes a lithium metal and/or a lithium alloy. The tape has a tensile strength of 20 N/10 mm or less at an elongation ratio of 200% or more.

Disclosed is a negative electrode material for a non-aqueous electrolyte secondary battery, including: a lithium silicate phase; silicon particles dispersed in the lithium silicate phase; and at least one element Me dispersed in the lithium silicate phase, and selected from the group consisting of a rare-earth element and an alkaline-earth metal. The composition of the lithium silicate phase is represented, for example, by the formula: LiSiO, and satisfies 0&#x3c;z&#x3c;2, and the element Me is dispersed in the lithium silicate phase, for example, as an Me oxide.

Negative electrode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

Disclosed is a negative electrode material including: a lithium silicate phase that contains a lithium silicate; and silicon particles that are dispersed in the lithium silicate phase, wherein the silicon particles have a crystallite size of 10 nm or more, and the lithium silicate has a composition represented by the following formula: LiSiO.(x&#x2212;2)SiO, where 2&#x3c;x&#x2264;18 is satisfied.

Negative electrode material and non-aqueous electrolyte secondary battery

In a nonaqueous electrolyte secondary battery containing a silicon material as a negative electrode active material, the initial charge-discharge efficiency is improved. Negative electrode active material particles () according to an embodiment each contain a lithium silicate phase () represented by LiSiO(where 0&#x3c;z&#x3c;2) and silicon particles () dispersed in the lithium silicate phase (). In base particles () each containing the lithium silicate phase () and the silicon particles (), preferably, a peak originating from SiOis not observed at 2&#x3b8;=25&#xb0; in an XRD pattern obtained by XRD measurement of the particles.

Negative electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery that contains a silicon material as a negative-electrode active material has improved initial charge/discharge efficiency. A negative-electrode active material particle () according to an embodiment contains a base particle (), which includes a lithium silicate phase () represented by LiSiO{0&#x3c;z&#x3c;2} and silicon particles () dispersed in the lithium silicate phase (). The base particle () has a porosity of 25% or less, preferably 15% or less.

Negative-electrode active material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

There is provided a negative electrode active material for a nonaqueous electrolyte secondary battery, the negative electrode active material including a base particle containing Si and SiO, a mixed phase coating that covers a surface of the base particle and contains SiOand carbon, and a carbon coating that covers a surface of the mixed phase coating. The base particle is preferably formed of SiO(0.5&#x2264;X&#x2264;1.5). The mixed phase coating preferably contains carbon dispersed in a phase formed of SiO. The cycle characteristics of a nonaqueous electrolyte secondary battery including negative electrode active material particles containing Si and SiOare improved.

Negative electrode active material for nonaqueous electrolyte secondary battery

The initial charge/discharge efficiency and cycle characteristics of a non-aqueous electrolyte secondary battery that contains a silicon material as a negative-electrode active material are improved. A negative-electrode active material particle () according to an embodiment includes a lithium silicate phase () represented by LiSiO{0&#x3c;z&#x3c;2} and silicon particles () dispersed in the lithium silicate phase (). The silicon particles () have a crystallite size of 40 nm or less. The crystallite size is calculated using the Scherrer equation from the half-width of the diffraction peak of the Si (111) plane in an XRD pattern obtained by XRD measurement of the negative-electrode active material particle

The initial charge/discharge efficiency and cycle characteristics of a non-aqueous electrolyte secondary battery that contains a silicon material as a negative-electrode active material are improved. A negative-electrode active material particle () according to an embodiment contains a base particle (), which includes a lithium silicate phase () represented by LiSiO{0&#x3c;z&#x3c;2} and silicon particles () dispersed in the lithium silicate phase (). The symmetry determined by an image analysis of a backscattered electron image of a cross section of the base particle () is 1.5 or less. The symmetry refers to the ratio (b/a) of the half width at half maximum b of a peak on the high-gray-scale side to the half width at half maximum a of the peak on the low-gray-scale side in a histogram of color distinction based on 256 gray levels for each pixel of the backscattered electron image.

In a nonaqueous electrolyte secondary battery containing SiOas a negative electrode active material, initial charge/discharge efficiency and cycle characteristics are increased. A negative electrode active material for nonaqueous electrolyte secondary batteries is provided. The negative electrode active material contains particles comprising of SiOx (0.8&#x2264;X&#x2264;1.2). The particles have cracks therein. SiOpreferably contains a lithium silicate phase, a Si-M compound, or an oxide of M (M is at least one selected from the group consisting of Al, Ti, Fe, and Ni). The cracks preferably extend radially from inner portions of the particles.

Negative electrode active material for nonaqueous electrolyte secondary batteries and nonaqueous electrolyte secondary battery containing negative electrode active material

A non-aqueous electrolyte battery is provided that shows good cycle performance and good storage performance under high temperature conditions and exhibits high reliability even with a battery configuration featuring high capacity. A method of manufacturing the battery is also provided. A non-aqueous electrolyte battery includes: a positive electrode having a positive electrode active material layer containing a positive electrode active material; a negative electrode having a negative electrode active material layer containing a negative electrode active material; a separator interposed between the positive electrode and the negative electrode; an electrode assembly including the positive electrode, the negative electrode, and the separator; and a non-aqueous electrolyte impregnated in the electrode assembly, characterized in that: the positive electrode active material contains at least cobalt or manganese; and a coating layer is formed on a surface of the negative electrode active material layer, the coating layer including filler particles and a binder.

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Hyogo, Japan

Hiroshi Minami