Battery and electronic device

Abstract

A battery comprises an electrode assembly and an electrolyte solution, wherein the electrode assembly comprises an anode plate, a cathode plate, and a separator located between the anode plate and the cathode plate. The electrolyte solution comprises a lithium salt and an organic solvent, wherein the organic solvent comprises a chain carboxylic ester compound, with the mass ratio of the chain carboxylic ester compound in the organic solvent being 10%-70%. The separator comprises a substrate, a first coating and a second coating, wherein the substrate comprises a first surface and a second surface, which are opposite each other; and the first coating and the second coating are respectively disposed on the first surface and the second surface. The first coating faces the anode plate; the second coating faces the cathode plate; the first coating comprises a first binder; the second coating comprises a second binder; and the average particle size of the second binder is greater than that of the first binder. The battery of the present application can take into consideration both high low-temperature cycle performance and high high-temperature cycle and storage performance. Further provided is an electronic device comprising the battery.

Description

technical field [0001] The present application relates to the battery field, in particular to a battery and an electronic device having the battery. Background technique [0002] Lithium-ion batteries have the advantages of large specific energy, high working voltage, low self-discharge rate, small size, light weight, etc., and have a wide range of applications in the field of consumer electronics. With the rapid development of electric vehicles and mobile electronic devices, people's requirements for battery performance (such as cycle performance) are getting higher and higher. [0003] In the prior art, it is usually difficult to balance the low-temperature cycle performance and high-temperature cycle performance of lithium-ion batteries. For example, in order to enable the battery to be used in a low-temperature environment, it is usually necessary to optimize the electrolyte solvent (such as adding a large amount of low-viscosity solvent), so that the electrolyte The vi...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, it is usually difficult to balance the low-temperature cycle performance and high-temperature cycle performance of lithium-ion batteries. For example, in order to enable the battery to be used in a low-temperature environment, it is usually necessary to optimize the electrolyte solvent (such as adding a large amount of low-viscosity solvent), so that the electrolyte The viscosity at low temperature is reduced and the conductivity is increased, thereby improving the low-temperature performance of lithium-ion batteries. However, the above-mentioned electrolyte system will deteriorate the high-temperature storage and high-temperature cycle performance of the battery; Suppressing the side reaction of battery gas production, improving the high-temperature cycle and storage performance of the battery, a separator with high adhesion performance is usually used, but the separator with high adhesion performance is not conducive to the improvement of the low-temperature cycle performance of the battery

Therefore, it cannot finally meet the requirements for lithium-ion batteries in actual use.

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