Secondary battery and electric device

Abstract

This application provides a secondary battery and an electrical device. The secondary battery includes a positive electrode and a negative electrode. The negative electrode active layer of the negative electrode includes a silicon-based material, and the positive electrode active layer of the positive electrode includes a lithium transition metal oxide and a lithium-containing phosphate with an olivine structure. The lithium-containing phosphate includes secondary particles I formed from primary particles I. The secondary particles I have pores between them, giving them a porous structure. In the cross-section of the secondary particles I, the area filled by the primary particles I accounts for 60%-85%. The secondary battery prepared in this application balances low-temperature performance and energy density.

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