Patent ID: 11888120
Assignee: NINGDE AMPEREX TECHNOLOGY LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. An electrochemical device, comprising an electrode and an electrolyte, wherein the electrolyte comprises a fluorinated cyclic carbonate, a multi-nitrile compound having an ether bond, a dinitrile compound, and a compound having a sulfur-oxygen double bond; wherein
the compound having a sulfur-oxygen double bond comprises at least one selected from the group consisting of 1,2-ethylene sulfate, 1,3-propanesultone, 1-fluoro-1,3-propanesultone, 2-fluoro-1,3-propanesultone, 3-fluoro-1,3-propanesultone, 1-methyl-1,3-propanesultone, 2-methyl-1,3-propanesultone, 3-methyl-1,3-propanesultone, 1-propene-1,3-sultone, 2-propene-1,3-sultone, 1-fluoro-1-propene-1,3-sultone, 2-fluoro-1-propene-1,3-sultone, 3-fluoro-1-propene-1,3-sultone, 1-fluoro-2-propene-1,3-sultone, 2-fluoro-2-propene-1,3-sultone, 3-fluoro-2-propene-1,3-sultone, 1-methyl-1-propene-1,3-sultone, 2-methyl-1-propene-1,3-sultone, 3-methyl-1-propene-1,3-sultone, 1-methyl-2-propene-1,3-sultone, 2-methyl-2-propene-1,3-sultone, 3-methyl-2-propene-1,3-sultone, 1,4-butane sultone, 1,5-pentane sultone, methylene methanedisulfonate, and ethylene methanedisulfonate; and
the dinitrile compound comprises at least one selected from the group consisting of succinonitrile and adiponitrile; wherein based on a total weight of the electrolyte, a weight percentage (Cf) of the fluorinated cyclic carbonate is greater than a weight percentage (Cn) of the multi-nitrile compound having an ether bond; and wherein,
based on a total weight of the electrolyte, a weight percentage of the compound having a sulfur-oxygen double bond is less than 4%;
wherein the electrode comprises a current collector of two different regions, each region coated with either a single-sided coating or a double-sided coating, wherein the single-sided coating is formed by coating a slurry only on one surface of the current collector; and the double-sided coating is formed by coating a slurry on two opposing surfaces of the current collector, and

wherein the electrode including the single-sided coating has an electrode compaction density D1, the electrode including the double-sided coating has an electrode compaction density D2, and D1 and D2 satisfy the relationship: about 0.8≤D1/D2≤about 1.2.