Technical points in the preparation of 18650 battery 10000mah

1. MCFC components

Research and development of MCFC began in 1950. In the following more than half a century, a lot of progress was made in electrode reaction mechanisms, battery materials, battery stack design, etc., and the scale continued to expand. It reached the 100kW level a few years ago and currently reaches 250~2000kW. 2. Electrode 2.1 Anode The anode of MCFC is Ni-Cr or Ni-Al alloy. The purpose of adding 2% to 10% C is to prevent sintering. The focus of research is to improve the performance of the electrode and develop sulfur-resistant anode materials. 2.2 Cathode The requirements for the cathode of MCFC are good conductivity, high structural strength, and low solubility in molten carbonate. The current NiO cathode has suitable conductivity and structural strength. Cathode dissolution is a major factor affecting the life of MCFC, especially when operating under pressure. Possible ways to solve cathode dissolution include: developing new cathode materials, increasing the thickness of the substrate, and adding additives to the electrolyte to increase its alkalinity. 3. Electrolyte 3.1 Carrier The carrier is a ceramic particle compound that forms a capillary network to accommodate the electrolyte. Supports provide structure to the matrix electrolyte but do not participate in electrical or electrochemical processes. The physical properties of the matrix are largely controlled by the carrier. The key to obtaining high-performance, long-life MCFC is to control the optimal distribution of molten carbonate electrolyte. Another aspect of electrolyte structural improvement is its ability to prevent the passage of gases. 3.2 Electrolyte The composition of the electrolyte also affects the performance and life of MCFC in several aspects. Creating a milder battery environment will help slow down cathode dissolution. One way is to add additives to the electrolyte to increase its alkalinity. A small amount of additives does not affect battery performance, but a large amount of additives can reduce battery performance. 4. A feature of single-cell MCFC is the use of electrolyte tiles (also called substrates) composed of carriers and carbonates. The electrolyte is fixed within the carrier. The electrolyte tile is both an ion conductor and a cathode and anode separator. Its plasticity can be used to seal the gas in the battery to prevent gas leakage. 5. The simple repetition of the single cell structure of the battery stack constitutes the battery stack structure. The separator, also called a bipolar plate, replaces the shell of the single cell and serves as the connection between cells. If the electrical contact between the bipolar plate and the electrodes is sufficient, one or both poles of the current collector can be eliminated. Both sides of the bipolar plate are corrugated to allow reaction gases to pass through. The bipolar plate corrugations are in electrolytic contact, applying constant pressure to reduce contact resistance. A major advantage of MCFCs is that the cell area can be made very large without causing large mechanical stress. This is due to the plasticity of the electrolyte tiles and the ductility of the metal bipolar plates.

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