Contemporary Amperex Technology has been granted a patent for a secondary battery and device. The battery includes a negative electrode plate with a silicon-based and carbon material, a separation film with a thickness of 7 µm˜12 µm, and an electrolyte with ethylene carbonate. The battery offers high energy density, good high-temperature cycle performance, high-temperature storage performance, and low low-temperature direct current resistance. GlobalData’s report on Contemporary Amperex Technology gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Contemporary Amperex Technology, hydrogen storage alloys was a key innovation area identified from patents. Contemporary Amperex Technology's grant share as of September 2023 was 35%. Grant share is based on the ratio of number of grants to total number of patents.
Secondary battery with improved performance and energy density
A recently granted patent (Publication Number: US11777134B2) describes a secondary battery with specific features and compositions. The battery includes a negative electrode plate with a negative current collector and a negative electrode film containing a silicon-based material and a carbon material. The battery also includes a separation film with a base material and a coating, and an electrolyte with an organic solvent. The base material of the separation film has a thickness of 7 µm to 12 µm, and the organic solvent includes ethylene carbonate (EC) with a weight ratio of =20%. The electrolyte further contains electrolyte salt, specifically lithium bisfluorosulfonimide (LiFSI) and lithium hexafluorophosphate (LiPF6), with molarities of 0.8 mol/L to 1.3 mol/L and 0.15 mol/L to 0.4 mol/L, respectively.
Additionally, the patent includes several other claims related to the secondary battery. These claims specify variations in the weight ratio of ethylene carbonate in the organic solvent, the thickness and porosity of the separation film, and the inclusion of other organic solvents such as ethyl methyl carbonate (EMC), diethyl carbonate (DEC), and dimethyl carbonate (DMC). The molarities of the electrolyte salts are also adjusted in some claims. Furthermore, the patent mentions the electrical conductivity and viscosity of the electrolyte, the mass ratio of the silicon-based material in the negative active material, and the inclusion of a positive electrode plate with a positive active material.
Overall, this granted patent presents a secondary battery design with specific compositions and characteristics. The inclusion of a silicon-based material in the negative electrode film, along with the specific electrolyte composition, aims to enhance the performance and efficiency of the battery. The variations in the weight ratios of organic solvents and the thickness and porosity of the separation film provide flexibility in the battery's design and performance. The patent also mentions the use of the secondary battery in a device, highlighting its potential applications in various electronic devices.