Effects of Conductive Agents and Binders on Compression and Compactability of NCM Powders

Effects of Conductive Agents and Binders on Compression and Compactability of NCM Powders

In the field of energy development, lithium-ion batteries have gradually become an important component of power sources (medical equipment, entertainment equipment, computers, communication equipment, electric vehicles, spacecraft, etc.) due to their advantages of low cost, environmental friendliness, high specific energy, light weight, and no memory effect. Lithium-ion battery positive electrode active materials often use transition metal oxides, such as layered lithium cobalt oxide, lithium nickel oxide, lithium nickel cobalt oxide, or lithium iron phosphate, and negative electrodes often use graphite, silicon-based materials, etc. as active materials.

During the development and production process of lithium-ion batteries, it was found that the conductivity of the positive and negative active material particles cannot meet the requirements of the electron migration rate. Therefore, conductive agents need to be added during the battery manufacturing process. The main function is to improve the electronic conductivity. The conductive agent conducts electrons and collects microcurrents between the active material particles and between the active material particles and the current collector, thereby reducing the contact resistance of the electrode and effectively reducing the polarization of the battery. Commonly used conductive agents for lithium batteries can be divided into traditional conductive agents (such as carbon black, conductive graphite, carbon fiber, etc.) and new conductive agents (such as carbon nanotubes, graphene and its mixed conductive slurry, etc.). Figure 1 is a schematic diagram of the distribution of conductive agents in lithium-ion battery pole pieces.

Figure 1. Schematic diagram of the distribution of conductive agents in lithium-ion battery electrodes ^[1]

Research progress on pre-lithiation types of silicon-based anodes and compatible binders

Pre-lithiation of silicon-based anode

Preface

With the development of society and the advancement of science and technology, energy consumption is increasing day by day, environmental pollution is also becoming increasingly serious, and has seriously threatened the future survival of mankind. Therefore, it is urgent to develop clean and environmentally friendly renewable energy. However, most renewable energy sources such as wind energy and solar energy are unstable and intermittent, while batteries can directly convert chemical energy into electrical energy, which is not only stable but also has high energy conversion efficiency, which can effectively alleviate the energy pressure we are facing now. Among them, lithium-ion batteries have been rapidly developed due to their advantages such as high energy density, long cycle life, and environmental friendliness, and are widely used in the fields of electronic products and electric vehicles.