Method for improving ion intercalation/deintercalation rate in energy storage layered material

Abstract

The invention discloses a method for improving the ion intercalation / deintercalation rate in an energy storage layered material, which comprises the following steps of preparing a layered positive electrode material, putting the layered positive electrode material into different electrolyte systems, and analyzing lattice information after ion intercalation of the layered positive electrode material and ion diffusion states under different conditions by using an electrochemical detection and theoretical calculation mode, acquiring the relationship between the difference between the interlayer spacing of the layered positive electrode material and the electrolyte cation size and the ion intercalation / deintercalation rate, and improving the ion intercalation / deintercalation rate of the energy storage layered material by regulating and controlling the difference, so that a high-rate positive electrode material system is obtained. By means of the mode, key factors influencing the ion intercalation / deintercalation rate can be obtained, so that the method for improving the ion intercalation / deintercalation rate in the energy storage layered material with universality and guiding significance is obtained, guidance of experimental design to obtain a high-rate battery system is facilitated, development of a power battery system is promoted, and the method has important social and economic significance.

Description

technical field [0001] The invention relates to the technical field of high-magnification layered material systems, in particular to a method for increasing the ion insertion / extraction rate of energy storage layered materials. Background technique [0002] As the core component of electric vehicles, power batteries are the key factors that determine the performance and large-scale application of new energy electric vehicles in the future. There are two most important performance indicators of batteries: energy density and rate performance. Among them, the energy density determines how much energy the battery can hold, and its characteristics are related to the intrinsic characteristics of the material system; the rate performance determines the charge and discharge speed, and the ion diffusion rate in the positive electrode material is the key factor affecting the battery rate performance. Therefore, increasing the intercalation / extraction rate of ions has important resear...

AI Technical Summary

Problems solved by technology

However, most studies only focus on the performance analysis of nanomaterials, without in-depth analysis of the factors affecting the rate performance. There is a lack of effective ways to improve the rate performance of practical micron-scale commercial cathode materials, resulting in the inability of experimental conclusions. Guide the industry to implement

On the one hand, nanoparticles have a high specific surface area, are light in weight, and are difficult to combine tightly together, which will reduce the compaction density of the electrode and limit the volumetric energy density of the battery; on the other hand, nanoparticles may interact with the electrolyte. Necessary chemical reactions, reducing service life

Moreover, nanomaterials will greatly increase the cost of batteries

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