Electrochemical device and electronic device containing same
AssigneeNingde Amperex Technology Limited
InventorRui Wang
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Abstract
An electrochemical device includes a positive electrode, a negative electrode, and a separator. The negative electrode includes a negative active material. The negative active material includes at least one of silicon, tin, germanium, antimony, bismuth, and aluminum. The separator includes a porous substrate and a coating. The coating is located between the porous substrate and the negative electrode, and the coating includes a polymer binder. Based on a total weight of the coating, a weight percent of the polymer binder is 1%-100%, and a ratio of a weight of the polymer binder in the coating per unit area to a specific capacity of a corresponding component of the negative electrode per unit area is 0.00013 mg/mAh-0.00045 mg/mAh.
Claims20
An electrochemical device, comprising:
- a positive electrode;
- a negative electrode;
- and
- a separator;
- wherein the negative electrode comprises a negative active material, and the negative active material comprises a carbon material and an active component;
- the active component is at least one of simple substance, alloys or compounds of silicon;
- based on a total weight of the negative active material, a weight percentage of the active component being greater than or equal to 7% and less than 15%,
- wherein the separator comprises a porous substrate and a coating, wherein the coating is located between the porous substrate and the negative electrode, and the coating comprises a polymer binder,
- based on a total weight of the coating, a weight percentage of the polymer binder is 1%-100%, and a ratio of a weight of the polymer binder in the coating per unit area to a specific capacity of the active component of the negative electrode per unit area is 0.00015 mg/mAh-0.00045 mg/mAh,
- the porous substrate includes at least one of polyolefin, polyamide, polyimide, polyester, or aramid fiber, and
- the polymer binder comprises at least one of polyvinylidene fluoride, polyvinylidene difluoride-co-hexafluoropropylene, or polyvinylidene difluoride-co-trichloroethylene.
An electronic device, comprising an electrochemical device, the electrochemical device comprises:
- a positive electrode;
- a negative electrode, wherein the negative electrode comprises a negative active material, and the negative active material comprises a carbon material and an active component, which is at least one of simple substance, alloys or compounds of silicon, based on a total weight of the negative active material, a weight percentage of the active component being greater than or equal to 7% and less than 15%;
- and
- a separator, wherein the separator comprises:
- a porous substrate and a coating, wherein the coating is located between the porous substrate and the negative electrode, and the coating comprises a polymer binder, and
- based on a total weight of the coating, a weight percentage of the polymer binder is 1%-100%, and a ratio of a weight of the polymer binder in the coating per unit area to a specific capacity of the active component of the negative electrode per unit area is 0.00015 mg/mAh-0.00045 mg/mAh,
- the porous substrate includes at least one of polyolefin, polyamide, polyimide, polyester, or aramid fiber, and
- the polymer binder comprises at least one of polyvinylidene fluoride, polyvinylidene difluoride-co-hexafluoropropylene, or polyvinylidene difluoride-co-trichloroethylene.
Dependencies are inferred from the claim text.