US 11,658,335 B2
Secondary battery and preparation method thereof, and battery module, battery pack, and apparatus containing such secondary battery
Meng Kang, Ningde (CN); Xiaobin Dong, Ningde (CN); Jiazheng Wang, Ningde (CN); and Libing He, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed by Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed on Jul. 4, 2022, as Appl. No. 17/810,610.
Application 17/810,610 is a continuation of application No. PCT/CN2020/106076, filed on Jul. 31, 2020.
Prior Publication US 2022/0336844 A1, Oct. 20, 2022
Int. Cl. H01M 4/587 (2010.01); H01M 10/0525 (2010.01); H01M 4/04 (2006.01); H01M 4/485 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/04 (2006.01); H01M 4/02 (2006.01)
CPC H01M 10/0525 (2013.01) [H01M 4/0404 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/587 (2013.01); H01M 10/0427 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2220/20 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A lithium ion secondary battery, comprising a cathode, an anode, a separator, and an electrolyte, wherein the anode comprises a negative electrode plate, wherein the negative electrode plate comprises a negative-electrode current collector and a negative-electrode film layer that is disposed on at least one surface of the negative-electrode current collector and that comprises a negative-electrode active material, the negative-electrode active material containing graphite, wherein the graphite comprises artificial graphite, wherein a median particle size by volume Dv50 of the negative-electrode active material satisfies 8 μm≤Dv50≤16 μm, wherein an areal density (AD) of the negative-electrode film layer satisfies 0.09 kg/m2≤AD≤0.117 kg/m2, wherein a press density (PD) of the negative-electrode film layer satisfies 1.53 g/m3≤PD≤1.68 g/m3, wherein the negative electrode plate satisfies the following:
when the negative electrode plate and a lithium metal sheet constitute a button battery which is discharged to 5.0 millivolts (mV) at 0.05 Coulomb (C), a capacity increment curve V-dQ/dV of the button battery has a third-order lithiation phase transition peak of graphite at position 0.055 volts (V)-0.085V.