Toyota Jidosha Kabushiki Kaisha

Yoshitomo Takebayashi

Masahiro Yoshioka

Takeshi Abe

Yohei Shindo

Tetsuya Waseda

Sho Ando

Ippei Toyoshima

Yusuke Shimo

Nobukiyo Ito

A nonaqueous electrolyte secondary battery includes an electrode body and a nonaqueous electrolyte solution. An electrolyte solution passage is a flow passage through which the nonaqueous electrolyte solution flows between the inside and the outside of the electrode body. A region of a negative-electrode composite material layer in contact with the electrolyte solution passage is a damming portion and a region located on the center side relative to the damming portion is a liquid retaining portion. The damming portion contains a negative electrode active material of which an electrical potential relative to a positive electrode active material is high and a ratio of expansion or contraction due to an increase or decrease in SOC is high, when compared to a negative electrode active material contained in the liquid retaining portion. The electrolyte solution passage can be closed by the damming portion in a charge state where the damming portion expands.

Nonaqueous electrolyte secondary battery and battery module

A non-aqueous electrolyte secondary battery, in which a positive electrode includes a positive electrode mixture layer in which a mixture containing a positive electrode active material is formed and a positive electrode mixture layer non-forming portion in which the positive electrode mixture layer is not formed, and a negative electrode includes a negative electrode mixture layer in which a mixture containing a negative electrode active material is formed and a negative electrode mixture layer non-forming portion in which the negative electrode mixture layer is not formed. At least one of the positive electrode mixture layer non-forming portion and the negative electrode mixture layer non-forming portion has a resin portion substantially formed of a swellable resin having a property of swelling the non-aqueous electrolyte.

Non-aqueous electrolyte secondary battery

According to the present disclosure, it is possible to appropriately prevent a shortage of a nonaqueous electrolyte solution in an electrode body and keep battery performance of a nonaqueous electrolyte secondary battery at a favorable state. A nonaqueous electrolyte secondary battery disclosed herein includes an electrode body and a nonaqueous electrolyte solution. The electrode body includes an electrolyte solution passage that is a flow passage through which the nonaqueous electrolyte solution flows between the inside and the outside of the electrode body. When a region of a negative-electrode composite material layer that is in contact with the electrolyte solution passage is referred to as a damming portion and a region that is located on the center side relative to the damming portion is referred to as a liquid retaining portion, the damming portion contains a negative electrode active material of which an electrical potential relative to a positive electrode active material is high and a ratio of expansion or contraction due to an increase or decrease in SOC is high, when compared to a negative electrode active material contained in the liquid retaining portion. With this configuration, the electrolyte solution passage can be closed by the damming portion in a charge state where the damming portion expands, and therefore leakage of the nonaqueous electrolyte solution can be suppressed.

A lithium ion secondary battery is disclosed that can inhibit generation of gas due to decomposition of a non-aqueous electrolyte solution. The lithium ion battery includes a cathode, a non-aqueous electrolyte solution and an anode, wherein the cathode includes a conductive material, a layered niobium-containing oxide that coats a surface of the conductive material, and a lithium-containing oxide active material having an upper-limit potential to a redox potential of metal lithium of no less than 4.5 V (vs. Li/Li).

Method for manufacturing lithium ion battery

In a capacity recovery method for a secondary battery including a negative electrode active material layer having a facing portion that faces a positive electrode active material layer and a non-facing portion that does not face the positive electrode active material layer, the secondary battery is retained in a state where temperature of the non-facing portion is higher than temperature of the facing portion for a prescribed time.

Capacity recovery method and capacity recovery system for secondary battery

According to the present invention, a nonaqueous electrolyte secondary battery that includes a positive electrode, a negative electrode and a nonaqueous electrolyte is provided. The positive electrode has an operation upper limit potential of 4.3 V or more based on metal lithium and includes a positive electrode active material and an inorganic phosphate compound that has ion conductivity. The inorganic phosphate compound is in a particle state. A ratio of particles having a particle size of 20 &#x3bc;m or more is 1% by volume or less when an entirety of the inorganic phosphate compound is set to 100% by volume. Further, a ratio of particles having a particle size of 10 &#x3bc;m or more may be 10% by volume or less when an entirety of the inorganic phosphate compound is set to 100% by volume.

Nonaqueous electrolyte secondary battery

The nonaqueous electrolyte secondary battery provided by the present invention has a positive electrodethat has a positive electrode active material layer, a negative electrodethat has a negative electrode active material layer, and separatorsinterposed between the positive electrode active material layerand the negative electrode active material layer. The positive electrode active material layercontains a positive electrode active material and an inorganic phosphate compound that contains an alkali metal and/or an alkaline-earth metal. A phosphate ion scavenger that scavenges a phosphate ion is disposed between the positive electrode active material layerand the negative electrode active material layerand/or in the negative electrode active material layer

Provided is a nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a nonaqueous electrolytic solution. The positive electrode includes a positive electrode current collector and a positive electrode active material layer that is formed on the positive electrode current collector. The positive electrode active material layer contains a positive electrode active material, an inorganic phosphate compound having ion conductivity, and a conductive material. The volatile component content in the conductive material is at least 0.15 mass % when measured according to JIS K 6221 (1982).

In a case where high-rate deterioration of a secondary battery progresses before execution of external charging by a charging device, an electronic control unit (ECU) executes an SOC adjustment process of adjusting an SOC of the secondary battery such that the SOC falls within a predetermined range. The predetermined range is a range where an expansion-contraction change of a negative electrode of the secondary battery along with charge and discharge of the secondary battery is small as compared with a case where the SOC is out of the predetermined range. After the execution of the SOC adjustment process, the ECU executes a process of moderating the high-rate deterioration so as to moderate the high-rate deterioration, and then executes the external charging.

Battery system for vehicle and control method thereof

Provided is a non-aqueous electrolyte secondary battery excellent in durability, the non-aqueous electrolyte secondary battery including a positive electrode active material, the surface of which is coated with a film formed of an inorganic solid electrolyte, wherein a change in volume of the positive electrode active material during charge and discharge is reduced to prevent deterioration of the film with which the surface of the positive electrode active material is coated. In a non-aqueous electrolyte secondary battery including a positive electrode active material, the surface of which is coated with a film formed of an inorganic solid electrolyte, the positive electrode active material is a lithium-containing composite oxide having a spinel structure, and contains at least one of Ti and Mg as an additional element.

Non-aqueous electrolyte secondary battery comprising surface-coated positive electrode material

The present teaching provides a nonaqueous electrolytic solution secondary battery in which both a satisfactory high-rate characteristic and a high cycle characteristic (prevention of decrease in capacity) are realized. The nonaqueous electrolytic solution secondary battery of the present teaching includes a positive electrode provided with a positive electrode active material layer, a negative electrode provided with a negative electrode active material layer, and a nonaqueous electrolytic solution. The negative electrode active material layer includes a negative electrode active material and carbon black. A coating film made of a lithium transition metal composite oxide having lithium ion conductivity is formed on at least part of a surface of the carbon black.

Growing community of inventors

Toyota, Japan

Yoshitomo Takebayashi