A lithium ion secondary battery comprising a negative electrode comprising a negative electrode active material comprising a silicon material selected from the group of consisting of metal silicon, alloys comprising silicon, and silicon oxides, and a polyacrylic acid, and an electrolyte solution comprising a fluoroethylene carbonate, wherein a 50% particle size of the silicon material is 2 μm or less, the polyacrylic acid is a copolymer and comprises a monomer unit based on an ethylenically unsaturated carboxylic acid, and a monomer unit based on an ethylenically unsaturated carboxylic ester, wherein the ethylenically unsaturated carboxylic acid includes acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid or itaconic acid, wherein the ethylenically unsaturated carboxylic ester includes acrylic acid esters, methacrylic acid esters, crotonic acid esters, maleic acid esters, fumaric acid esters or itaconic acid esters, wherein the content of the monomer unit based on an ethylenically unsaturated carboxylic acid is 50% by mass or more, wherein the content of the monomer unit based on an ethylenically unsaturated carboxylic ester is 10% by mass or more and 20% by mass or less; and wherein the amount of the polyacrylic acid is 0.5 parts by mass or more and 10 parts by mass or less based on 100 parts by mass of the negative electrode active material, the content of the silicon material in the total amount of the negative electrode active material is 5% by mass or more and 30% by mass or less, and the content of the fluoroethylene carbonate in the electrolyte solution is 5% by mass or more and 30% by mass or less. a negative electrode comprising a negative electrode active material comprising a silicon material selected from the group of consisting of metal silicon, alloys comprising silicon, and silicon oxides, and a polyacrylic acid, and an electrolyte solution comprising a fluoroethylene carbonate, wherein a 50% particle size of the silicon material is 2 μm or less, the polyacrylic acid is a copolymer and comprises a monomer unit based on an ethylenically unsaturated carboxylic acid, and a monomer unit based on an ethylenically unsaturated carboxylic ester, wherein the ethylenically unsaturated carboxylic acid includes acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid or itaconic acid, wherein the ethylenically unsaturated carboxylic ester includes acrylic acid esters, methacrylic acid esters, crotonic acid esters, maleic acid esters, fumaric acid esters or itaconic acid esters, wherein the content of the monomer unit based on an ethylenically unsaturated carboxylic acid is 50% by mass or more, wherein the content of the monomer unit based on an ethylenically unsaturated carboxylic ester is 10% by mass or more and 20% by mass or less; and wherein the amount of the polyacrylic acid is 0.5 parts by mass or more and 10 parts by mass or less based on 100 parts by mass of the negative electrode active material, the content of the silicon material in the total amount of the negative electrode active material is 5% by mass or more and 30% by mass or less, and the content of the fluoroethylene carbonate in the electrolyte solution is 5% by mass or more and 30% by mass or less. <EOS>