Electrolyte and electrochemical apparatus
AssigneeNingde Amperex Technology Limited
InventorsYanyan Xu, Chunrui Xu, Jianming Zheng
Life of this patent
Estimating the term…
Abstract
An electrochemical apparatus including a positive electrode, a negative electrode, an electrolyte, and a separator. The positive electrode includes a positive electrode current collector and a positive active material layer disposed on the positive current collector. An X-ray photoelectron spectroscopy of the positive active material layer has a peak at 164 eV to 175 eV. The electrolyte has a retention capability of 1.0 g/Ah to 4.0 g/Ah. The electrolyte improves cycle performance, over-discharge storage performance, and safety performance of the electrochemical apparatus.
Claims18
An electrochemical apparatus, comprising:
- a positive electrode, a negative electrode, an electrolyte and a separator;
- wherein the positive electrode comprises a positive electrode current collector and a positive active material layer disposed on the positive current collector;
- an X-ray photoelectron spectroscopy of the positive active material layer has a peak at 164 eV to 175 eV, and the electrolyte has a retention capability of 1.0 g/Ah to 4.0 g/Ah;
- wherein the electrolyte comprises an additive A, and the additive A comprises at least one of a compound of formula II, a compound of formula III, or a compound of formula IV:
- wherein R1 is selected from H, C1-6 alkyl, or C2-6 alkenyl;
- R2, R3, R4, R5, R6, and R7 are each independently selected from H, a halogen, C1-6 alkyl unsubstituted or substituted with one or more halogen, or C2-6 alkenyl unsubstituted or substituted with one or more halogen;
- m is an integer from 1 to 3;
- and
- wherein the positive active material layer comprises first particles and second particles;
- a cross section perpendicular to the positive electrode current collector in the positive electrode is measured by using a scanning electron microscope, a gray scale of the first particles is not less than 115 RGB, a gray scale of the second particles is less than 115 RGB, and a cross-sectional area of the first particles is less than 20 square micrometers.
An electronic apparatus, comprising an electrochemical apparatus;
- wherein the electrochemical apparatus comprises a positive electrode, a negative electrode, an electrolyte and a separator;
- wherein the positive electrode comprises a positive electrode current collector and a positive active material layer disposed on the positive current collector, an X-ray photoelectron spectroscopy of the positive active material layer has a peak at 164 eV to 175 eV, and the electrolyte has a retention capability of 1.0 g/Ah to 4.0 g/Ah;
- wherein the electrolyte comprises an additive A, and the additive A comprises at least one of a compound of formula II, a compound of formula III, or a compound of formula IV:
- wherein R1 is selected from H, C1-6 alkyl, or C2-6 alkenyl;
- R2, R3, R4, R5, R6, and R7 are each independently selected from H, a halogen, C1-6 alkyl unsubstituted or substituted with one or more halogen, or C2-6 alkenyl unsubstituted or substituted with one or more halogen;
- m is an integer from 1 to 3;
- and
- wherein the positive active material layer comprises first particles and second particles;
- a cross section perpendicular to the positive electrode current collector in the positive electrode is measured by using a scanning electron microscope, a gray scale of the first particles is not less than 115 RGB, a gray scale of the second particles is less than 115 RGB, and a cross-sectional area of the first particles is less than 20 square micrometers.
Dependencies are inferred from the claim text.