Non-aqueous electrolyte secondary battery and method for manufacturing the same
AssigneesJtekt Corporation, Toyota Jidosha Kabushiki Kaisha
InventorsAtsushi SUGIHARA, Takashi KONO, Tetsuya WASEDA, Masanori KITAYOSHI, Tsubasa MATSUDA, Shuji TSUTSUMI, Naoyuki WADA
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Abstract
A non-aqueous electrolyte secondary battery includes a mixture layer of a negative electrode. The mixture layer contains carboxymethyl cellulose. A product of a median diameter (μm) of a negative electrode active material contained in the negative electrode and a ratio of a weight (wt %) of the carboxymethyl cellulose adsorbed on the negative electrode active material to a weight of the negative electrode active material is not less than 2.2 and not larger than 4.2.
Claims4
A non-aqueous electrolyte secondary battery comprising
- a mixture layer of a negative electrode, the mixture layer containing carboxymethyl cellulose,
- wherein a product of a median diameter (μm) of a negative electrode active material contained in the negative electrode and a ratio of a weight (wt %) of the carboxymethyl cellulose adsorbed on the negative electrode active material to a weight of the negative electrode active material is not less than 2.2 and not larger than 4.2.
A method for manufacturing a non-aqueous electrolyte secondary battery, the method comprising:
- kneading a raw active material, carboxymethyl cellulose, and water to produce a primary kneaded body;
- diluting the primary kneaded body by adding water to produce a negative electrode paste;
- coating the negative electrode paste onto metal foil and drying the negative electrode paste;
- pressing the dried negative electrode paste to form a negative electrode;
- specifying an oil adsorption amount of linseed oil to the raw active material to not lower than 50 ml and not higher than 60 ml per 100 g of the raw active material in producing the primary kneaded body, wherein the oil adsorption amount is an amount at the time when a viscosity characteristic of the raw active material exhibits a 70% torque of a maximum torque produced when linseed oil is titrated into the raw active material;
- forming the negative electrode so that a median diameter of a negative electrode active material contained in the formed negative electrode is set to not smaller than 8 μm and not larger than 13 μm;
- and
- specifying a product of the median diameter (μm) of the negative electrode active material and a ratio of a weight (wt %) of the carboxymethyl cellulose adsorbed on a negative electrode active material to a weight of the negative electrode active material to a value not less than 2.2 and not larger than 4.2.
Dependencies are inferred from the claim text.