US 12,230,800 B2
Secondary battery and apparatus containing the secondary battery
Jianjun Ma, Ningde (CN); Rui Shen, Ningde (CN); Libing He, Ningde (CN); Baojian Zhu, Ningde (CN); and Lei Chen, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed on Dec. 10, 2021, as Appl. No. 17/547,280.
Application 17/547,280 is a continuation of application No. PCT/CN2020/081690, filed on Mar. 27, 2020.
Prior Publication US 2022/0102724 A1, Mar. 31, 2022
Int. Cl. H01M 4/587 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/58 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/587 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/5825 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2220/20 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A secondary battery, comprising a positive electrode plate and a negative electrode plate, the positive electrode plate comprising a positive electrode current collector and a positive electrode film that is disposed on at least one surface of the positive electrode current collector and comprises a positive active material, the negative electrode plate comprising a negative electrode current collector and a negative electrode film that is disposed on at least one surface of the negative electrode current collector and comprises a negative active material,
wherein the positive active material comprises one or more of layered lithium transition metal oxides and layered lithium transition metal oxides are modified by doping and/or surface coating;
the negative active material comprises a first material and a second material, the first material comprises artificial graphite, the second material comprises natural graphite,
the natural graphite has a powder resistivity of from 10.0 mΩ·cm to 14.0 mΩ·cm under a pressure of from 8 MPa;
the artificial graphite has a powder resistivity of from 11.0 mΩ·cm to 16.0 mΩ·cm under a pressure of 8 MPa; and
the negative electrode plate has a resistance R satisfying 6 mΩ≤R≤12.0 mΩ.