JP-2022551434-A5 -

JP2022551434A5JP 2022551434 A5JP2022551434 A5JP 2022551434A5JP-2022551434-A5

Dates

Publication Date: 20230509
Application Date: 20200929

Description

According to the fourth example, A spheroidized carbon-based anode active material, The specific surface area of the negative electrode active material is 1.5 to 2.8 m² /g. The total pore volume of the negative electrode active material is 1.0e⁻² to 1.8e⁻² cm³ /g. A spheroidized carbon-based anode active material is provided, wherein the specific surface area of pores having a size of 24 nm or more in the anode active material is 0.1 to 0.8 m² /g. According to the sixth example of implementation, in the fourth or fifth example of implementation, The total pore volume of the negative electrode active material can be 1.19 e⁻² to 1.57 e⁻² cm³ /g. A spheroidized carbon-based anode active material according to another aspect of the present invention is The specific surface area of the negative electrode active material is 1.5 to 2.8 m² /g. The total pore volume of the negative electrode active material is 1.0e⁻² to 1.8e⁻² cm³ /g. In the anode active material, the specific surface area of pores having a size of 24 nm or larger is 0.1 to 0.8 m² /g. The total pore volume of the negative electrode active material is 1.0e⁻² to 1.8e⁻² cm³ / g , and according to one embodiment of the present invention, it can be 1.19e⁻² to 1.57e⁻² cm³ /g. When the total pore volume of the negative electrode active material satisfies this range, it is advantageous in terms of high-temperature storage performance due to a reduction in side reactions with the electrolyte. In particular, satisfying all the conditions that the specific surface area of the negative electrode active material is 1.5 to 2.8 m² /g, the total pore volume of the negative electrode active material is 1.0e⁻² to 1.8e⁻² cm³ / g , and the specific surface area of pores having a size of 24 nm or larger in the negative electrode active material is 0.1 to 0.8 m² /g is important in that it reduces irreversibility, suppresses side reactions, and suppresses the increase in swelling due to gas generation over a long lifespan.