Detailed explanation of the coating process of lithium-ion battery pole pieces

Effect of coating process on lithium battery performance

Pole sheet coating generally refers to a process of evenly coating the stirred slurry on the current collector and drying the organic solvent in the slurry. The coating effect has an important impact on the battery capacity, internal resistance, cycle life and safety, ensuring that the pole sheet is evenly coated. The selection of coating method and control parameters have an important impact on the performance of lithium-ion batteries, mainly manifested in:

Some possible reasons and corresponding explanations for the preparation and process of button cells/soft packs

Button battery

1.Basic Introduction

Lithium-ion button batteries are mainly composed of the following parts: positive electrode shell, negative electrode shell, (positive/negative) electrode sheet, diaphragm, gasket, spring, and electrolyte. The C in the commonly used regular commercial button battery CR2032 indicates that the positive electrode is MnO2, and there is also a BR series, and B indicates that the positive electrode is carbon fluoride. C or B represents the button battery system, and R represents that the battery shape is round.

Assembly of button batteries

1.About

Button cells, also known as coin cells or battery cells, are compactly designed batteries shaped like small buttons. They are widely used in various small electronic devices, such as car keys, TWS wireless earbuds, watches, calculators, hearing aids, and some medical devices and precision electronic instruments. Their characteristics include a small size and light weight, making them ideal for applications where space is limited.

Button-type full battery design, assembly and testing tutorial and case analysis

1. Introduction

A full cell is a complete battery system that includes a positive electrode, a negative electrode, a separator, an electrolyte, and a shell. Unlike a half-cell, a full cell can provide an accurate assessment of the electrochemical and mechanical properties of an actual battery when it is in operation. A half-cell usually uses a metal sheet or foil (such as a lithium sheet or foil) as a counter electrode, while a full cell consists of two active electrodes, one as the positive electrode and the other as the negative electrode. The design and assembly of a full cell need to consider a variety of factors, including the choice of electrode materials, the type of electrolyte, the properties of the separator, and the structure of the battery shell to ensure the performance, safety, and reliability of the battery . Full cell testing is usually used to evaluate the degree of match between the positive and negative electrode materials and the rest of the battery, as well as the performance of the battery under actual use conditions. This article mainly introduces the design, assembly, and testing of full cells based on laboratory button-type full cells, and analyzes the factors affecting the design of full cells with examples.

The three-step process of button cell lithium battery assembly, testing, and data analysis.

 1.The Charging and Discharging Modes of Button Cells

The charging and discharging tests of button lithium batteries typically use constant current charging (CC), constant current-constant voltage charging (CC-CV), constant voltage charging (CV), and constant current discharging (DC) to test and analyze the battery's charging and discharging behavior. By analyzing the data changes during this process, various electrochemical performance parameters of the battery or material, such as capacity, coulombic efficiency, charging and discharging plateau, and internal parameter variations, can be characterized.

The preparation of lithium-ion battery electrode slurries and the assembly of coin (or button) cells

 1. Basic Introduction to Coin-Cell Batteries

Lithium-ion coin-cell batteries are mainly composed of the following parts: positive shell, negative shell, (positive/negative) electrode sheets, separator, gasket, spring, and electrolyte.

Commonly used coin-cell batteries include CR2032, CR2025, CR2016, etc. "C" represents a coin cell type, and "R" indicates the battery shape is round. The first two digits represent the diameter (in mm), and the last two digits represent the thickness (in 0.1 mm), with approximate numbers used for both. For example, the approximate dimensions of a CR2032 are 20 mm in diameter and 3.2 mm in thickness. 

The commercialization of all-solid-state battery production

The commercialization of all-solid-state battery production is a complex system engineering process, with its core mainly consisting of three key components: material system development, cell structure design, and cell production control. To produce a high-performance commercial all-solid-state battery, it is essential to master these three core aspects. Once the process for manufacturing commercial all-solid-state batteries is mastered, assembling and producing coin-type half-cells, coin-type full-cells, and simple structure flexible batteries (with a single positive/negative electrode stacked structure) becomes relatively easy.