Anode material of lithium battery and lithium battery using anode material

Abstract

The invention discloses an anode material of a lithium battery. The anode material of the lithium battery contains lithium cobalt oxide, wherein the grain diameter D50 of the lithium cobalt oxide is 2-16 microns; the specific surface area of the lithium cobalt oxide is 0.2m<2> / g-1.0m<2> / g. According to the anode material of the lithium battery, an inventor does a lot of researches on the grain diameter and the specific surface area of the lithium cobalt oxide; when the grain diameter and the specific surface area of the lithium cobalt oxide are finally found to be in the range, a path of embedding lithium ions is short, the resistance is small and the resistance of the battery is low and low-temperature discharging requirements of the lithium battery are met. Furthermore, the invention further discloses a lithium battery containing the anode material; the lithium battery adopts the anode material containing the lithium cobalt oxide with the small grain diameter so that the ion resistance is small and the lithium ions are easy to embed; therefore, the discharge capacity retention ratio of the lithium battery at the low temperature is improved effectively.

Description

technical field [0001] The invention relates to a positive electrode material for a battery and a battery using the positive electrode material, in particular to a positive electrode material for a lithium battery and a lithium battery using the positive electrode material. Background technique [0002] Lithium battery is an energy storage device with high specific energy, which has the advantages of stable discharge voltage, wide operating temperature range, low self-discharge rate, cycle charge and discharge, long storage life, no memory effect and no pollution. At present, as the application fields of lithium-ion batteries become more and more extensive, different users have different requirements for lithium-ion batteries. In the field of low-temperature lithium batteries, the capacity requirements for low-temperature discharge are getting higher and higher. [0003] As an important component that affects the performance of lithium batteries, the positive active materia...

AI Technical Summary

Problems solved by technology

[0005] CN102325478A discloses a lithium-ion battery system and a method for improving the low-temperature discharge performance of a lithium battery. In this patent application document, although the particle size of lithium cobaltate used in the positive electrode system is small, it can only reach a temperature of -20°C. The capacity retention rate reaches more than 85% during discharge, and its technical effect is realized by the joint action between the positive electrode system, the negative electrode system and the electrolyte. Therefore, the lithium battery disclosed in this document still cannot meet the requirements for low-temperature discharge. capacity requirements