A complete analysis of lithium battery internal resistance, understand the core parameters in one article!

A complete analysis of lithium battery internal resistance, understand the core parameters in one article!

[Scientific Research] A complete analysis of the internal resistance of lithium batteries: from DCR to EIS, understand the core parameters in one article!

Practical EIS data fitting, a must-have skill for battery professionals!

Practical EIS data fitting, a must-have skill for battery professionals!

1. Zview software: the golden partner of battery research

🔧 Software advantages: Accurate modeling: drag and drop equivalent circuit elements with one click, support complex models such as CPE and Warburg. Batch processing: suitable for comparing battery impedance changes under different SOC/temperatures.

Paper-level drawing: directly export fitting curves and parameter tables, eliminating Origin secondary processing.

💡 Applicable scenarios: lithium battery SEI film analysis, electrode interface dynamics research, fast charging performance evaluation

Key auxiliary materials for lithium batteries: binders

Polymer and its derivative binders

1 Cellulose binder

Sodium carboxymethyl cellulose (CMC) is a cellulose binder that has been widely studied. It is a carboxymethylated derivative of cellulose. CMC is an ionic chain polymer water-based binder that forms a transparent viscous glue after swelling with water. It has the advantages of being difficult to ferment, good stability, low price, safety and environmental protection.

Negative electrode binder performance requirements, test methods and failure mechanisms!

Binders have a low mass ratio in the electrode and do not participate in the electrochemical reaction. Their main function is to adhere the active material and the conductive agent to the current collector to keep the electrode intact . Binders affect the formation of the solid electrolyte interface (SEI) , the charge transfer inside the electrode and between the electrode - electrolyte interface , the wetting behavior of the electrode, and the cycle performance and cost of the battery .

Analysis of the influence of slurry quality on coating surface fluctuation｜‌Lithium battery production process front end (mixing/coating)

Lithium battery production process - mixing/coating

The production process of lithium batteries varies among different battery manufacturers. Generally speaking, it is divided into three stages: front, middle and back.

1. Front section: pole piece production

(Mixing, coating, tableting, baking, slitting, tableting, tab forming)

(Core link: coating)

2. Middle section: battery cell assembly

(winding or lamination, pre-packaging of cells (into shells), electrolyte injection, sealing)

(Core link: winding)

3. Post-processing (activating the battery cell)

(battery cell formation, capacity division, static placement, testing, and sorting)

(Core links: formation, volume fractionation, and testing)

Introduction to lithium battery production process, process flow, principle, formula, and parameters

Exploring the mixing process of lithium-ion batteries---mixer

Understand the principle of lithium-ion battery mixing equipment in one article

Found the culprit! -- Stanford University EES reveals: the fundamental reason for the difference in Coulombic efficiency of high-performance lithium metal battery electrolytes!

                  

Lithium metal batteries are considered ideal energy storage devices due to their high capacity and energy density, but the high activity of lithium limits their commercialization. In recent years, advances in the design of liquid electrolytes have improved the efficiency of lithium metal batteries, but the efficiency improvement has reached a bottleneck, and the reason is still unclear.

Zhou Haoshen from Nanjing University and Chang Zhi from Central South University, "Nature Commun.: A new approach to improving the performance of high-voltage lithium metal batteries!

Science Bulletin: Carbonate electrolyte releases NO₃⁻ and I⁻ to achieve stable lithium metal batteries!

                   

The formation of inactive lithium (Li) in lithium metal batteries (LMBs) mainly originates from the undesirable components of the solid electrolyte interface (SEI) and the growth of lithium dendrites. Lithium nitrite (LiNO₃) as an electrolyte additive has shown great potential to alleviate interfacial instability and lithium dendrite growth by in situ constructing a nitride-rich SEI. However, the limited solubility of LiNO₃ in carbonate electrolytes (~0.01 mg mL⁻¹) restricts its practical application.

Effect of conductive agent on the electronic conductivity of mixed powder & electrode

Positive and negative electrode powder materials, separators, electrolytes, conductive agents, binders, current collectors, etc. are the main raw materials for the manufacture of lithium-ion batteries; the production of lithium-ion batteries is the process of processing these raw materials into batteries under the optimal process conditions. Changes in the parameters of these raw materials require targeted optimization and adjustment of the process conditions to obtain lithium-ion batteries with optimal electrical performance. The design of the parameters of the positive and negative electrode sheets of lithium-ion batteries is the key to the development of lithium battery processes, including active material loading, porosity, thickness, and the ratio between active materials, conductive agents, and binders. Among them, the type , content, and performance of the conductive agent are key factors affecting the electron transmission during the charging and discharging process of lithium-ion batteries, and the electron conduction characteristics directly determine the quality of the electrochemical performance.

Latent dissolution behavior of electrolytes: high voltage, high stability batteries | NSR

Potassium-ion batteries are low-cost, abundant in resources, and have a potential high voltage window, showing great potential in the field of large-scale energy storage. The electrolyte has a significant impact on the performance of the battery. Ether-based electrolytes have attracted much attention because they can effectively dissolve potassium salts and provide high ionic conductivity. However, this type of electrolyte also has obvious shortcomings: weak antioxidant ability and poor compatibility with graphite negative electrode materials . This greatly limits its application in battery systems.

Lithium battery double-layer coating technology principle

Double-layer coating is a multi-layer microstructure design for lithium-ion battery pole pieces to improve electrode performance, such as:

Research and application of new binders in lithium batteries

I. Introduction

In the electrode materials of lithium batteries, the proportion of binder is usually between 1% and 10%. Its main function is to bind the active materials, current collectors and conductive agents of the electrode together, thereby enhancing the performance and stability of the electrode. The active materials and conductive agents in the electrode are often nano-scale, and these nano-materials are prone to agglomeration in high-concentration electrode slurries.

Analysis of Lithium Battery Injection Process

The role of lithium battery electrolyte is to conduct ions between the positive and negative electrodes and act as a medium for charging and discharging, just like blood in the human body. How to make the electrolyte fully and evenly infiltrate the interior of the lithium battery has become an important issue. Therefore, the injection process is a very important process that directly affects the performance of the battery.

The "Breathing Technique" in Lithium Battery Baking: Decoding the Core Technology of Nitrogen Cycle

Why is nitrogen circulation introduced in the vacuum baking of lithium batteries? The seemingly safe inert gas actually hides the risk of condensation! Behind the efficiency improvement is the ultimate control of the "breathing rhythm" by precision technology - this article deciphers the game logic of nitrogen filling, dehumidification and risk prevention and control.

Is it necessary to introduce nitrogen circulation during vacuum baking of battery cells? When filling with nitrogen, the pressure inside the cavity will change. Will the moisture condense again and affect the baking effect?

Salt-assisted recovery of sodium metal anode for high-rate sodium batteries———Wei Weifeng AM, Central South University

 Wei Weifeng AM, Central South University: Salt-assisted recovery of sodium metal anode for high-rate sodium batteries

Background

Rechargeable sodium metal batteries are considered to be one of the most promising electrochemical energy storage systems with high energy density and high cost performance. However, the inactive sodium (Na) formed during storage and assembly processes has seriously hindered its practical application. This chemical instability stems from the high activity of Na, which chemically reacts with oxygen and moisture during electrode processing or electrochemically reacts with the electrolyte during battery operation, easily leading to excessive accumulation of inactive Na species on the surface, resulting in battery performance degradation or even failure.