Isostatic Pressing Bags for Isostatic Pressing Solid-state Batteries
Isostatic Pressing Bags for Isostatic Pressing Solid-state Batteries
Some processes and equipment of solid-state batteries are compatible with LIB. In the front-end electrode manufacturing process, the traditional wet process is also applicable to the production of solid-state batteries. Equipment such as material mixing and coating in the old production line can be transferred and used through technical transformation, reducing the cost of technological transformation. In the semi-solid battery route, since the electrolyte still exists, the mature processes and equipment at the middle and back ends can also be normally compatible; the solid electrolyte can be formed through the coating process at the middle end, or it can be added after the liquid injection at the back end. In-situ solidification” link (injecting liquid electrolyte first, then gelling it) to form. In the all-solid-state battery route, there is no need for liquid injection, which greatly simplifies the production process.
The assembly of solid-state batteries requires a new booster step. The production of solid-state batteries generally stacks positive electrodes, solid electrolytes, and negative electrodes directly together. Considering that the solid-state electrolyte should form a good solid-solid contact interface with the electrode, contact loss will occur during cycling, and the formation of lithium dendrites should be inhibited, so it is often necessary to apply several MPa pressures to make the materials densely packed when stacking. Add pressurization equipment.
Isostatic pressing technology is expected to become the key direction. The traditional hot pressing and rolling pressing schemes provide limited and uneven pressure, which makes it difficult to ensure the consistency of dense stacking, which seriously affects the performance of solid-state batteries. Oak Ridge National Laboratory Dixit et al. (2022) pointed out that isostatic pressing technology may become one of the necessary processes for mass production of solid-state batteries in the future. Isostatic pressing is based on Pascal's principle, using liquids and gases (such as water, oil or argon) inside the machine to exert a uniform pressure on the cell to produce a highly uniform material. However, this technology is still at the stage of cutting-edge accumulation. The difficulty lies in how to select the appropriate combination of pressing temperature and pressure, and how to control the texture of the pressing. There is still a certain gap between the production efficiency and yield and the existing mature technology. At present, only South Korea’s Samsung and other A handful of companies have successfully applied it.
Jiangsu High Industry on the research and development and production of high-performance polyurethane isostatic pressing molds. Through in-depth cooperation with many isostatic pressing equipment manufacturers and in-depth study of the industry, the developed isostatic pressing polyurethane mold series products have the characteristics of long service life, high precision, small deformation, easy demoulding, etc., and are widely used in ceramics, etc. Static pressing mould, cemented carbide isostatic pressing mould, rare earth permanent magnet material isostatic pressing mould, graphite isostatic pressing mould, etc.
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