	US 12,381,211 B2
	Silicon-oxygen compound, secondary battery using it, and related battery module, battery pack and device
Chengdu Liang, Ningde (CN); Yingjie Guan, Ningde (CN); Yuzhen Zhao, Ningde (CN); Yan Wen, Ningde (CN); and Qisen Huang, Ningde (CN)
Assigned to Contemporary Amperex Technology (Hong Kong) Limited, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Nov. 1, 2022, as Appl. No. 18/051,519.
Application 18/051,519 is a continuation of application No. 17/059,423, granted, now 11,522,181, previously published as PCT/CN2020/103488, filed on Jul. 22, 2020.
Claims priority of application No. 201910688521.3 (CN), filed on Jul. 29, 2019.
Prior Publication US 2023/0119054 A1, Apr. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/48 (2010.01); H01M 4/485 (2010.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)

CPC H01M 4/485 (2013.01) [H01M 4/625 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)]

16 Claims

1. A secondary battery comprising: a positive electrode plate, a negative electrode plate, a separator, and an electrolyte, wherein the negative electrode comprises a negative electrode current collector and a negative electrode film disposed on at least one surface of the negative electrode current collector, the negative electrode film comprises a negative active material comprising a silicon-oxygen compound, wherein the silicon-oxygen compound has a formula of SiO_x, in which 0<x<2, the silicon-oxygen compound has an average particle diameter Dv50 of 3 μm to 12 μm, a specific surface area from 1 m²/g to 7 m²/g, a compacted density measured under a pressure of 5 tons of 1.2 g/cm³to 1.7 g/cm³, and the silicon-oxygen compound contains both sulfur and aluminum element, and a content of the sulfur element is 20 ppm to 300 ppm; a content of the aluminum element is from 5 ppm to 150 ppm; and a mass ratio of the sulfur element to the aluminum element is from 1.5 to 13.0.