Lithium ion battery

A lithium ion battery including a positive electrode, a negative electrode, and an electrolyte,

• the negative electrode having a current collector, and a negative electrode active material layer disposed on the current collector and containing lithium silicate particles and a binder,
• the lithium silicate particles comprising 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 including at least a first resin, wherein the first resin is at least one selected from the group consisting of polyacrylic acid, a polyacrylic acid salt, and their derivatives, and
• the first resin being contained in an amount of 2 mass % or less in the negative electrode active material layer.