High-power multi-component material and preparation method thereof

Abstract

The invention provides a high-power type multi-component material and a preparation method thereof, and the molecular formula of the high-power type multi-component material is as follows: LiNi1-a-bCoaMnbO2; 1-a-b is greater than or equal to 0.2 and is less than 1; 0.5> a; b> 0; the morphology features are as follows: the primary particle diameter is 0.2-1.5 mu m, the high-power type multi-component material is a hollow structure with the particle size D50 of internal multiple pores of 4-10 mu m, M elements are doped in the particles, and M is one or a combination of Ce, Nd, Eu, Er, Ta, W andSn. The high-power type multi-component material is a ternary material with a special microstructure, a primary particle polymerized secondary particle precursor with more pores inside is prepared through special process control, and an internal porous multi-element positive electrode material with a primary particle coating structure can be formed in a roasting process after the precursor is mixed with lithium salt; the secondary particle ternary material with high power and long service life can be obtained while the advantages of low cobalt content and low cost are guaranteed, the primary particle coating technology is used, the service life of the roasted material is effectively prolonged, meanwhile, the secondary sintering process is reduced, and the production cost of the material isgreatly reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion cathode materials, and in particular relates to a high-power multi-element material and a preparation method. Background technique [0002] Lithium-ion battery is a kind of high-energy battery that has developed rapidly in the past ten years. Due to its advantages of high voltage, high specific energy, long cycle period, and low environmental pollution, it has become a key direction for the development of my country's new energy industry. . The positive electrode material is an important part of lithium-ion batteries, and it is also the part with the highest cost ratio in lithium-ion batteries. [0003] At present, ternary materials have been widely concerned in the commercial application of new energy vehicles due to their high specific energy density and long cruising range. And with the continuous decline of battery manufacturing costs, the proportion of ternary material power batteries us...

AI Technical Summary

Problems solved by technology

[0005] (1) Power materials are mostly secondary agglomerated balls, which are prone to structural peeling and collapse from the grain boundaries under high-voltage or high-current charging and discharging conditions, causing a large capacity decay of the battery during high-temperature cycling;

[0006] (2) The power performance is poor and cannot meet the needs of the existing battery cell development;

However, the increase in grain size brings about an increase in internal resistance, leading to adverse reactions such as power performance degradation.

Increasing the content of cobalt can improve the conductivity of the positive electrode material, but the increase in its price does not meet the needs of car manufacturers, so there are fewer positive electrode material options for HEV and PHEV

Images