Patent ID: 11923528
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A non-aqueous electrolyte secondary battery comprising: a positive electrode capable of electrochemically absorbing and desorbing lithium, a negative electrode capable of electrochemically absorbing and desorbing lithium; and a non-aqueous electrolyte,
wherein the negative electrode includes a negative electrode material, a binder, and a thickener,
the negative electrode material includes an LSX particle including a lithium silicate phase, and silicon particles dispersed in the lithium silicate phase,
a ratio of the silicon particles in the LSX particle is 30 mass % or more,
the binder includes a poly(meth)acrylic acid alkali metal salt,
the thickener includes a carboxyalkyl cellulose,
an amount of the poly(meth)acrylic acid alkali metal salt relative to 100 parts by mass of the negative electrode material is 0.1 parts by mass or more and 5 parts by mass or less, and
the non-aqueous electrolyte includes a lithium salt, a non-aqueous solvent that dissolves the lithium salt, and an acid that exhibits a pKa of 1 to 30 in water at 25 ° C.,
wherein a concentration of the acid in the non-aqueous electrolyte is 0.01 to less than 0.05 mass %, wherein the concentration of the acid in the non-aqueous electrolyte exists at least in an initial state of the battery,
wherein the acid includes polycarboxylic acid, and
wherein the polycarboxylic acid is selected from malonic acid, oxalic acid, fumaric acid, phthalic acid, or combinations thereof.