Non-aqueous electrolyte secondary battery and method for manufacturing non-aqueous electrolyte secondary battery
AssigneeMurata Manufacturing Co., Ltd.
InventorToshikazu NAKAMURA
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Abstract
A non-aqueous electrolyte secondary battery includes at least a negative electrode including a negative electrode mixture, a positive electrode, and an electrolytic solution including an electrolyte and a solvent. The negative electrode mixture includes a negative electrode active material powder, the negative electrode active material powder includes a carbon-based material and a silicon-based material, a mixing ratio of the carbon-based material to the silicon-based material (carbon-based material (mass %)/silicon-based material (mass %)) is 90 mass %/10 mass % to 0 mass %/100 mass %.
Claims16
A non-aqueous electrolyte secondary battery comprising:
- a negative electrode including a negative electrode mixture;
- a positive electrode;
- and
- an electrolytic solution including an electrolyte and a solvent,
- wherein the negative electrode mixture includes a negative electrode active material powder,
- the negative electrode active material powder includes a carbon-based material and a silicon-based material,
- a mixing ratio of the carbon-based material to the silicon-based material (carbon-based material (mass %)/silicon-based material (mass %)) is from 90 mass %/10 mass % to 0 mass %/100 mass %,
- a negative electrode potential at a point of a battery voltage of 0 V is 3.2 Vvs(Li/Li+) or less in a deep discharging at a current rate of 0.001 ItA reaching the battery voltage of 0 V, and an electrolyte concentration in the negative electrode mixture is higher than an electrolyte concentration in the electrolytic solution.
A method for manufacturing a non-aqueous electrolyte secondary battery including at least a negative electrode including a negative electrode active material powder, a positive electrode, and an electrolyte, the method comprising:
- a method for manufacturing the negative electrode for a non-aqueous electrolyte secondary battery which includes pre-doping lithium ions to the negative electrode active material powder through electrochemical treatment in an electrolyte-containing liquid and mixing at least the pre-doped negative electrode active material powder with a binder;
- and
- assembling the non-aqueous electrolyte secondary battery by using the negative electrode, the positive electrode and the electrolyte.
Dependencies are inferred from the claim text.