Using mathematical models will help the design of lithium batteries

With the rapid upgrading of electronic products in the world and the vigorous development of the new energy automotive industry, smart power grid, and power station energy storage, lithium-ion batteries are the core of these modern high-tech industries and occupy a pivotal position. The advantages and disadvantages of battery design directly determine the fate of lithium electric enterprises in fierce market competition.

All along, for major lithium electric companies in China, the design of batteries has come from repeated experiments. Although the final battery performance has been optimized, it has consumed huge manpower, material resources and time, including many highly educated researchers. With the increasing complexity of the battery system, enterprises will increasingly invest in battery design, but the design of battery performance is not necessarily a proportion of improvement.

This inefficient design method is also one of the important reasons why domestic battery design technology always lags behind abroad. However, it is even more regrettable that many companies have not yet realized this problem. Perhaps some companies with a good research and development foundation are aware of it, but they do not know how to coordinate manpower and find appropriate ways to solve it.

The mathematical model of lithium-ion battery is to parameterize the physical indexes and electrode design indexes of various materials used in the battery. Through mathematical calculation, the battery's charge and discharge, multiplier, and cycle properties are obtained. So by adjusting one or more of these parameters, it can be used to design batteries, predict battery performance, and optimize their purpose.

For example, the particle scale of different active materials will lead to different material utilization rates, which will affect the capacity of the electrode, which will help battery designers to select active materials. In addition, the electrode crush density and electrode porosity will also affect the final performance of the battery. Using the model, the effect of different crush density or porosity on battery performance can be calculated, and the electrode design and manufacturing process can be optimized.

Dr Maozhiyu, of the Department of Chemical Engineering at the University of Waterloo in Canada, recently published his findings in journals such as the American Electrochemical Society and the International Journal of Electrochemistry on how mathematical models are used in the field of lithium-ion batteries. How to guide the design and optimization of lithium-ion electrode efficiently.

This study can liberate lithium researchers from time-consuming experiments and establish links between active materials, electrode design, and battery performance, allowing engineers to quantitatively consider battery design from the point of view of materials, processes, and electrode design. Optimization of manufacturing process and failure model analysis, which opened up new ideas and direction of lithium ion battery development. In addition, it can also be used to analyze the electrode reaction Kinetics, understand its internal reaction mechanism, and give theoretical guidance to battery R&D workers.

Gaogong Li-Yi will publish Dr. Maozhiyu's research results one after another. As a concrete example of the application of mathematical models in the design of lithium-ion batteries, Dr. Maozhiyu also welcomes various lithium-related technology R&D engineers and scholars to communicate with her(Email: Zhiyumao@gmail.com).

Dr Maozhiyu graduated from the Department of Chemical Engineering at the University of Waterloo, Canada. During his Ph.D., he mainly engaged in the study of electrode models and longevity decline mechanisms of commercial lithium-ion power cells. He developed model identification techniques for commercial lithium-ion battery active materials. The evaluation system of battery life is established.

The mathematical model he developed played an important role in the design and optimization of the electrodes of lithium ion batteries. During this period, he published 5 engineering articles in the first author's authoritative journals in the field of lithium electricity, such as "Journal of Electricality" and "Electricica Acta".

Dr Maozhiyu has seven years of experience in theoretical research on lithium ion battery engineering and two years of experience in commercial lithium ion battery development. He has conducted systematic and in-depth research on the reaction Kinetics involved in lithium iron phosphate electrodes. He was also responsible for the experimental design and project management of the "JS-208" common technology project of the Central Electric Vehicle Industry Alliance. Since September 2016, he has continued to study in Canada for postdoctoral research and joined Newtech PowerInc. as a scientific researcher. He is mainly responsible for the development and industrialization of new lithium electric materials and new energy storage systems.

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