Toyota Jidosha Kabushiki Kaisha

Daikin Industries, Ltd.

Hiroto Asano

Toshiyuki Kawai

Shigeaki Yamazaki

Shinichi Kinoshita

Shimpei Kondo

Shinsuke Matsuhara

Ryuta Sugiura

Kunihiko Hayashi

Tomoya Hidaka

Chikaaki Okuda

Tsuyoshi Sasaki

Akira Kohyama

Shinpei Kondo

Akira Koyama

A method of producing a lithium ion secondary battery disclosed here, includes a process of preparing an electrode body which includes a positive electrode and a negative electrode and in which the negative electrode contains a negative electrode material containing graphite having open pores and SiOdisposed in the open pores; a process of producing a battery assembly including the electrode body and a non-aqueous electrolytic solution containing LiPFwith a concentration of 1 mol/L or more; a process of initially charging the battery assembly; and a process of performing an aging treatment on the initially charged battery assembly in an environment of a temperature of 50&#xb0; C. or higher.

Method of producing lithium ion secondary battery and negative electrode material

The disclosure provides an electrolyte solution that enables a lithium ion secondary battery to have reduced initial resistance, a small increase in resistance at high-temperature cycles, and reduced gas generation at high temperature. The electrolyte solution for a lithium ion secondary battery contains lithium difluorophosphate, an oxalic acid ion, and a compound (1) represented by the following formula (1): wherein Rand Rare each independently a methyl group, an ethyl group, a propyl group, or a butyl group.

Electrolyte for lithium ion secondary battery, lithium ion secondary battery, and module

Provided is a nonaqueous electrolyte solution to which lithium tetraborate is added, for a lithium secondary battery, the nonaqueous electrolyte solution being capable of reducing the resistance of a lithium secondary battery. A nonaqueous electrolyte solution for a lithium secondary battery disclosed herein contains lithium tetraborate as a first additive, and a difluorophosphate salt as a second additive.

Nonaqueous electrolyte solution for lithium secondary battery

A battery includes at least an electrode array and an electrolyte solution. The electrolyte solution contains at least a solvent and a supporting salt. The electrode array includes at least a positive electrode, a porous insulating layer, and a negative electrode. The porous insulating layer is interposed between the positive electrode and the negative electrode. The porous insulating layer contains at least a group of inorganic nanoparticles and a group of polymer particles. Each inorganic nanoparticle in the group of inorganic nanoparticles is a dielectric. Each inorganic nanoparticle in the group of inorganic nanoparticles is in contact with the electrolyte solution.

Battery and method of producing the same

Provided is an electrolyte solution for lithium secondary batteries that allows lowering the resistance of a lithium secondary battery, and suppressing characteristic degradation of the lithium secondary battery under high temperature. The electrolyte solution for lithium secondary batteries disclosed herein contains 0.05 mass % to 2.0 mass % of a compound represented by Formula (1) below. (In the formula, Mrepresents a quaternary ammonium cation or a nitrogen-containing heteroaromatic ring cation, and Rrepresents a C-Calkyl group in which an ether oxygen is optionally inserted.) 

Electrolyte solution for lithium secondary batteries, and lithium secondary battery

A negative electrode which includes graphite particles and which is capable of imparting superior input resistance characteristics to a nonaqueous lithium-ion secondary battery is provided. The negative electrode of a nonaqueous lithium-ion secondary battery disclosed herein includes graphite particles as negative electrode active materials and a supported material being supported by the graphite particles. The graphite particles have phenolic hydroxy groups. The supported material has surface hydroxy groups. A ratio of an amount B (mmol/g) of the surface hydroxy groups in the supported material to an amount A (mmol/g) of the phenolic hydroxy groups in the graphite particles is 30 or more and 150 or less.

Negative electrode of nonaqueous lithium-ion secondary battery and nonaqueous lithium-ion secondary battery using same

Provided is a non-aqueous electrolytic solution for a lithium ion secondary cell that can reduce the initial resistance of the lithium ion secondary cell and can suppress the increase in resistance when the lithium ion secondary cell is allowed to stand at high temperature. The non-aqueous electrolytic solution for a lithium ion secondary cell disclosed herein includes a light metal salt represented by the following formula (I) and a silyl sulfate compound represented by the following formula (II). The content of the light metal salt in the non-aqueous electrolytic solution for a lithium ion secondary cell is 0.1% by mass or more and 1.5% by mass or less. The content of the silyl sulfate compound in the non-aqueous electrolytic solution for a lithium ion secondary cell is 0.1% by mass or more and 5.0% by mass or less (each symbol in the formulas is as defined in the specification). 

Non-aqueous electrolytic solution for lithium ion secondary cell

The present disclosure provides a nonaqueous electrolyte solution that is used in a nonaqueous electrolyte secondary battery. The nonaqueous electrolyte solution contains a fluorinated solvent, a predetermined additive A and a predetermined additive B. A ratio (C/C) of concentration C(mol/L) of the additive A and concentration C(mol/L) of the additive B lies in a range of 1 to 30.

Nonaqueous electrolyte solution and method for producing nonaqueous electrolyte secondary battery

A nonaqueous electrolyte solution used for a nonaqueous electrolyte secondary battery includes a cyclic carbonate and a fluorinated carboxylate ester including two fluorine atoms on an alpha carbon atom derived from a carboxylic acid as a nonaqueous solvent.

Nonaqueous electrolyte solution, nonaqueous electrolyte secondary battery, and method of producing nonaqueous electrolyte secondary battery

The present invention provides an electrolyte solution in which a decrease in capacity retention is suppressed and an increase in gas production is suppressed even when stored at high temperatures. Provided is an electrolyte solution containing: a compound (1) represented by formula (1): CFCFXCOOR, wherein Xis a hydrogen atom, a fluorine atom, or a C1-C3 alkyl group in which hydrogen atoms are optionally replaced by fluorine atoms, and Ris a C1-C3 alkyl group in which hydrogen atoms are optionally replaced by fluorine atoms; a fluorinated carbonate; and a cyclic acid anhydride.

Electrolyte solution, electrochemical device, lithium ion secondary battery, and module

Provided is an electrolyte solution for a lithium secondary battery, which can lower the resistance of a lithium secondary battery and impart the lithium secondary battery with high cycle characteristics. The electrolyte solution for a lithium secondary battery disclosed here includes an electrolyte salt consisting essentially of a lithium imide salt, a solvent containing methyl difluoroacetate, and an unsaturated carboxylic acid anhydride compound represented by formula (1) below as an additive (in the formula, Rand Reach independently denote a hydrogen atom, a fluorine atom, or an alkyl group that may be fluorine-substituted, or Rand Rbond to each other to form a ring structure). 

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Nisshin, Japan

Hiroto Asano