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US 12,700,581 B2Granted
Electrochemical apparatus and electronic apparatus
AssigneeNingde Amperex Technology Limited
InventorKefei Wang
Life of this patent
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Abstract
An electrochemical apparatus, including a positive electrode, a negative electrode, and an electrolyte. The negative electrode includes a negative electrode current collector and a negative electrode active substance layer formed on the negative electrode current collector. The negative electrode current collector has a high tensile strength and the negative electrode active substance layer has a specific weight. The electrochemical apparatus has improved high-temperature storage expansion performance and cyclic expansion performance.
Claims13
An electrochemical apparatus, comprising:
- a positive electrode, a negative electrode, and an electrolyte;
- wherein the negative electrode comprises a negative electrode current collector and a negative electrode active substance layer formed on the negative electrode current collector;
- wherein
- the negative electrode current collector has a tensile strength of F N/mm2, wherein F is greater than 400;
- wherein a weight per unit area of the negative electrode active substance layer is W mg/cm2, wherein W is within a range of 3 to 12;
- wherein a density of the negative electrode active substance layer is D g/cm3, and D is within a range of 1.7 to 2.0, wherein 900≤F×D≤1200;
- wherein the electrolyte comprises a compound having cyano group, and wherein based on a weight of the electrolyte, a content percentage of the compound having cyano group is b % and b is within a range of 3.5 to 10,
- wherein the negative electrode current collector comprises copper and a first metal, the first metal comprises silver and tin, and based on the weight of the negative electrode current collector, a content percentage of the first metal is a %, wherein a is within a range of 0.01 to 0.5;
- wherein the negative electrode current collector further comprises at least one rare earth element, and the rare earth element comprises yttrium.
6 more elements
An electronic apparatus, comprising:
- an electrochemical apparatus;
- wherein the electrochemical apparatus comprises a positive electrode, a negative electrode, and an electrolyte;
- the negative electrode comprises a negative electrode current collector and a negative electrode active substance layer formed on the negative electrode current collector;
- wherein the negative electrode current collector has a tensile strength of F N/mm2, wherein F is greater than 400;
- wherein a weight per unit area of the negative electrode active substance layer is W mg/cm2, wherein W is within a range of 3 to 12;
- wherein a density of the negative electrode active substance layer is D g/cm3, and D is within a range of 1.7 to 2.0, wherein 900≤F×D<1200;
- wherein the electrolyte comprises a compound having cyano group, and wherein based on a weight of the electrolyte, a content percentage of the compound having cyano group is b % and b is within a range of 3.5 to 10,
- wherein the negative electrode current collector comprises copper and a first metal, the first metal comprises silver and tin, and based on the weight of the negative electrode current collector, a content percentage of the first metal is a %, wherein a is within a range of 0.01 to 0.5;
- and
- wherein the negative electrode current collector further comprises at least one rare earth element, and the rare earth element comprises yttrium.
7 more elements
Dependencies are inferred from the claim text.