US 11799131

US Patent 11799131, titled "Electrolyte and electrochemical device," was issued to Ningde Amperex Technology Ltd. on October 24, 2023, from an application filed on August 11, 2022. The inventors are Kefei Wang, Qiao ZENG, Liangzhen XIAO, and Fei Wu.

Abstract:
The patent describes an electrochemical device that includes an electrode and an electrolyte. The electrolyte is characterized by containing a dinitrile compound (X), a trinitrile compound (Y), and propyl propionate (Z). Specific weight percentages and ratios are defined: 2 wt % ≤ (X+Y) ≤ 11 wt %, and 0.1 ≤ (X/Y) ≤ 8. The electrode has a coating comprising a single-sided sub-coating with an electrode compaction density D1 and a double-sided coating with an electrode compaction density D2, where 0.8 ≤ D1/D2 ≤ 1.2. The patent asserts that this combination of electrolyte composition and electrode compaction density ratio significantly improves the cycle performance of the electrochemical device.

Plain-Language Overview of Independent Claims:

• Independent Claim 1: This claim describes an electrolyte for an electrochemical device. It must contain three main components: a dinitrile compound (which forms a protective film on the cathode), a trinitrile compound, and propyl propionate. The claim specifies the concentrations of the dinitrile (X) and trinitrile (Y) compounds based on the total weight of the electrolyte. Specifically, the combined weight percentage (X+Y) must be between approximately 2 wt % and 11 wt %, and the ratio of their individual weight percentages (X/Y) must be between approximately 0.1 and 8.

• Independent Claim 10: This claim describes an electrochemical device that incorporates the electrolyte defined in Claim 1. In addition to the specific electrolyte composition, this device includes electrodes, each having a current collector and a coating. The coating can be single-sided, double-sided, or a combination. The claim further specifies that if the electrode has both a single-sided coating (with compaction density D1) and a double-sided coating (with compaction density D2), the ratio D1/D2 must be between approximately 0.8 and 1.2.

• Independent Claim 14: This claim broadly covers an electronic device that includes the electrochemical device described in Claim 10.

Litigation Status:
US Patent 11799131 is currently active and is involved in litigation. It has a "Family has litigation" status with links to external litigation databases. Specifically, there is a US case filed in the Texas Eastern District Court (case 2:24-cv-00728) and two PTAB cases, IPR2025-00431 (Pending - Instituted) and IPR2025-00722 (Not Instituted - Procedural).