Extra-high-voltage multiplying power lithium battery positive pole system manufacturing method

Abstract

The invention discloses an extra-high-voltage multiplying power lithium battery positive pole system manufacturing method which comprises the step: covering graphene powder on the surface of a lithiumbattery positive pole matrix to form a protection layer with excellent physical characteristics. Namely, a hard physical characteristic and a high-temperature conduction function of the graphene areutilized. Therefore, the lithium battery positive pole system prepared by the method disclosed by the invention can achieve extra-high energy density large current charge and discharge, 4.5V or more high-voltage multiplying power batteries can be prepared, and the collapse phenomenon is effectively avoided.

Description

【Technical field】 [0001] The invention relates to a battery manufacturing method, in particular to a manufacturing method of an ultra-high voltage rate lithium battery cathode system. 【Background technique】 [0002] High-voltage lithium cobaltate cathode material, as a newly emerged product in the lithium battery cathode material system, has higher energy density, but poor rate performance and high temperature performance, which restricts the further promotion of high-voltage lithium battery materials. In addition, the upper limit of charging of the positive electrode material coated with titanium metal has been limited, and the upper limit of charging cannot be further increased, that is, a higher energy density cannot be achieved, and the current upper limit of charging for high-voltage rate batteries can only reach 4.4V. It is necessary to pursue ultra-high energy density batteries, and then develop towards higher voltages. During the charging and discharging process, the...

AI Technical Summary

Problems solved by technology

[0002] High-voltage lithium cobalt oxide cathode material, as a newly emerged product in the lithium battery cathode material system, has higher energy density, but its rate performance and high temperature performance are not good, which restricts the further promotion of high-voltage lithium battery materials

In addition, the charging limit of the positive electrode material coated with titanium metal has been limited, and the charging limit cannot be further increased, that is, a higher energy density cannot be achieved, and the current high-voltage rate battery charging limit can only reach 4.4V

It is necessary to pursue ultra-high energy density batteries, and then develop towards higher voltages. During the charging and discharging process, the structure of the positive electrode material will "collapse", causing the battery to fail