Particles and method for producing same, and secondary battery and method for producing same

A particle containing graphite (A) and a particle (B) containing an element silicon, the particle having a chromaticity b * of 2.0 or less. The chromaticity b * of the particles is preferably from 0.2 to 1.1 (inclusive), and the chromaticity a * is preferably from 0.2 to 1.2 (inclusive). A method for manufacturing a secondary battery including a positive electrode, a negative electrode, and an electrolyte, the negative electrode including a current collector and a negative electrode active material layer formed on the current collector, the negative electrode active material layer including the graphite. 一种粒子，其包含石墨(A)和含有硅元素的粒子(B)，该粒子的色度b*为2.0以下。粒子的色度b*优选为0.2以上且1.1以下，色度a*优选为0.2以上且1.2以下。一种二次电池的制造方法，该二次电池包含正极、负极及电解质，该负极包含集电体和该形成于集电体上的负极活性物质层，该负极活性物质层包含该石墨。