NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

DRIVE April 17, 2024
Source
A negative electrode for a nonaqueous electrolyte secondary battery includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector. The negative electrode mixture layer includes a first layer and a second layer. The first layer is formed on the negative electrode current collector and includes a negative electrode active material and a first binding agent. The negative electrode active material in the first layer includes a carbon material A and a Si-containing compound. The first binding agent includes polyacrylic acid or a salt thereof. The second layer is formed on the first layer and includes a negative electrode active material and a second binding agent. The negative electrode active material in the second layer includes a carbon material B. The carbon material B has a tap density higher than a tap density of the carbon material A. A mass of the first layer relative to a mass of the negative electrode mixture layer is 50 mass% or greater and less than 90 mass%. A mass of the second layer relative to the mass of the negative electrode mixture layer is greater than 10 mass% and 50 mass% or less. A packing density of the second layer is lower than a packing density of the first layer.

Discussion in the ATmosphere

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