Preparation process of a high discharge capacity stable lithium battery cell

Abstract

The invention discloses a preparation process of a high-discharge-capacity stable lithium battery cell, comprising the following steps: S1, preparation and synthesis of the positive electrode material of the lithium battery cell; S2, preparation of the negative electrode material of the lithium battery cell; S3, preparation of the positive electrode sheet of the battery; S4, the preparation of the negative pole piece of the battery; S5, the preparation of a high discharge capacity stable lithium battery cell. The invention adopts co-precipitation method and high-temperature solid-phase sintering method to synthesize lithium-rich manganese-based positive electrode materials, and uses TiO2 nanocrystals to anchor nitrogen-doped amorphous mesoporous hollow carbon nanospheres to prepare negative electrode materials, and the prepared lithium batteries have high charge and discharge performance. capacity, stable cycle performance and excellent rate capability.

Description

technical field [0001] The invention belongs to the field of lithium battery technology, and in particular relates to a preparation process of a high-discharge-capacity stable lithium battery. Background technique [0002] Lithium-ion batteries have the advantages of high capacity, low consumption, small volume, small internal resistance and many cycles. Among them, the positive electrode material of lithium-ion battery not only plays a vital role in improving the capacity and cycle performance of the battery, but also is the key to reducing the overall cost of new energy vehicles. Among many positive electrode materials, the lithium-rich manganese-based layered positive electrode material has The characteristics of high capacity, low price and low galvanization are considered to be one of the most promising positive electrode materials at present. Although researchers have invested a lot of time and energy in researching Li-rich manganese-based positive electrode materials ...

AI Technical Summary

Problems solved by technology

Among them, the positive electrode material of lithium-ion battery not only plays a vital role in improving the capacity and cycle performance of the battery, but also is the key to reducing the overall cost of new energy vehicles. Among many positive electrode materials, the lithium-rich manganese-based layered positive electrode material has The characteristics of high capacity, low price and low galvanization are considered to be one of the most promising positive electrode materials at present. Although researchers have invested a lot of time and energy in researching Li-rich manganese-based positive electrode materials and have carried out practical applications, However, this lithium battery cathode material still has defects such as low initial Coulombic efficiency, poor cycle performance at high voltage, and poor rate performance, which largely limits its application in fields such as hybrid electric vehicle batteries. Long cycle life, high energy density and excellent portability make it the main power source for portable electronic products, electric vehicles and stationary energy storage systems. Nowadays, lithium batteries have poor conductivity, slow reaction power, low discharge specific capacity and stable cycle Disadvantages of poor sex