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)
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.