CAS:358-64-5，Tris(2,2-difluoroethyl) phosphate，（TDPT）

The invention provides an electrochemical device and an electronic device comprising the electrochemical device, and the electrochemical device comprises a positive electrode and an electrolyte; the positive electrode comprises a positive electrode current collector and a positive electrode material layer arranged on at least one surface of the positive electrode current collector; the method comprises the following steps: after the first charge-discharge cycle of an electrochemical device, selecting any region with the size of 20 mu m * 20 mu m on a positive current collector, the number of holes in the region is X, and X is an integer from 0 to 10; the electrolyte comprises fluorine-containing sulfimide salt and a fluorine-containing substance Y, based on the mass of the electrolyte, the mass percentage content of the fluorine-containing sulfimide salt is A%, the mass percentage content of the fluorine-containing substance Y is B%, and X, A and B meet the relational expression that AX/B is larger than or equal to 0 and smaller than or equal to 450. The relationship among X, A and B is limited in the range, so that the safety performance of the electrochemical device is improved, and meanwhile, the cycle performance of the electrochemical device is effectively improved.

The invention provides a wide-temperature solid electrolyte, and belongs to the technical field of methods for directly converting chemical energy into electric energy. Comprising the following components in percentage by mass: 30%-50% of a deep eutectic solvent, 5%-15% of a multi-branched cross-linking agent, 10%-40% of a weak solvent and 5%-35% of a lithium salt, and the mass fraction of the deep eutectic solvent is 30%-50%, the mass fraction of the multi-branched cross-linking agent is 5%-15%, the mass fraction of the weak solvent is 10%-40% and the mass fraction of the lithium salt is 5%-35%. The working temperature of the electrolyte provided by the invention is-50 DEG C to 100 DEG C, the thermodynamic property of an electrode/electrolyte interface and the reversibility of active lithium can be improved, and the number of charge and discharge cycles and the charge and discharge capacity retention ratio of the battery are improved.

The present application provides an electrochemical device and an electronic device comprising same. The electrochemical device comprises a positive electrode and an electrolyte solution, wherein the positive electrode comprises a positive electrode current collector and a positive electrode material layer that is arranged on at least one surface of the positive electrode current collector; after the initial charge-discharge cycle of the electrochemical device is finished, any region with a size of 20 μm*20 μm is selected on the positive electrode current collector, the number of holes in the region is X, and X is an integer from 0 to 10; the electrolyte solution comprises a fluorine-containing sulfimide salt and a fluorine-containing substance Y, and on the basis of the mass of the electrolyte solution, the mass percent content of the fluorine-containing sulfimide salt is A%, and the mass percent content of the fluorine-containing substance Y is B%, where X, A and B satisfy the relational expression: 0≤AX/B≤450. By limiting the relationship among X, A and B within the range, the safety performance of the electrochemical device is improved, and moreover the cycle performance thereof is also effectively improved.