High-voltage electrolyte and high-voltage lithium ion battery

Abstract

The invention discloses a high-voltage electrolyte and a lithium ion battery. The high-voltage electrolyte comprises a non-aqueous organic solvent, an electrolyte salt, a conventional high-voltage electrolyte additive and a functional additive. The functional additive has a general chemical formula of AXB or AB. The electrolyte functional additive is added into the conventional high-voltage electrolyte additive so that the high-voltage electrolyte is prepared. The lithium ion battery containing the high-voltage electrolyte comprises a positive pole and a negative pole. In the lithium ion battery, the additives in the high-voltage electrolyte can produce synergism, can form interfacial films on surfaces of the positive and negative poles, can inhibit electrode surface reaction activity, can reduces electrolyte oxidation decomposition and can effectively inhibit Qi distention so that lithium ion battery high temperature performances, cycle performances at a normal temperature under normal pressure, and a service life are improved and lithium separation in the lithium ion battery working at a low temperature is reduced.

Description

technical field [0001] The present invention relates to a kind of can improve lithium ion battery in 3.0~5.0VLi / Li + High-voltage electrolytes and lithium-ion batteries that improve cycle performance and high-temperature performance under low-temperature lithium precipitation. Background technique [0002] With the rapid development of increasingly miniaturized and lightweight portable electronic devices, the demand for small, lightweight, thin and high-performance batteries that provide power for these portable electronic devices is increasing. Due to the continuous improvement of battery volume and mass energy density Therefore, increasing the operating voltage of lithium-ion batteries to increase the energy density of batteries is the focus of current research. At present, a variety of high-voltage cathode materials have been developed, such as LiNi with a spinel structure. x mn (2-x) o 4 and LiMP0 with olivine structure 4 wait. However, as the voltage increases, th...

AI Technical Summary

Problems solved by technology

However, as the voltage increases, the conventional electrolyte will oxidize and decompose on the surface of the positive electrode material in addition to its own oxidative decomposition reaction. The positive electrode material containing transition metal elements plays a catalytic role to promote the oxidation of the electrolyte. Eventually, the internal resistance of the battery will increase, the cycle performance will be destroyed, and the service life of the battery will be seriously shortened.

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