Analysis of Current Status of Solid Capacitor Industry in China

As a capacitor product with better growth, the solid capacitor has a good application prospect. Solid-state capacitors use high polymer materials with high conductivity and good thermal stability to replace traditional electrolytes. Compared with common liquid aluminum electrolytic capacitors, they have high reliability, long service life, high frequency, low impedance, and large ripple current resistance. Each solid-state capacitor can replace 2-3 ordinary aluminum electrolytic capacitors, which is conducive to the integration and miniaturization of electronic products, and can overcome the drawbacks of liquid aluminum electrolytic capacitors that are prone to leakage. In the laptop, LCDTV, 3D displays, game consoles and other fields have a huge market space. With the 4G network, the development of electronic information industry and upgrading of consumer structure, especially with the decline in the selling price of its core raw materials, the application of solid-state capacitors will continue to expand, and the market demand will grow rapidly.

There are many advantages compared to liquid capacitors. Capacitors, one of the three major passive electronic components (resistors, capacitors, and inductors) occupy an important position in the electronic components industry and are essential electronic components in electronic circuits. Among the electronic components used in the entire machine, capacitors are the most widely used and the largest amount, accounting for about 40% of the total electronic components used.

Capacitors can be classified into aluminum/niobium electrolytic capacitors, ceramic capacitors, film capacitors, paper capacitors, mica capacitors, etc. in terms of the types of dielectric materials. Among them, aluminum/niobium electrolytic capacitors, ceramic capacitors, and film capacitors occupy approximately three types of capacitors. More than 90% of the total market.

Aluminum electrolytic capacitors can be divided into liquid aluminum electrolytic capacitors and solid aluminum electrolytic capacitors from the different electrolytes. The liquid aluminum electrolytic capacitors can be divided into three types: lead wire, solder lug, solder pin, and bolt type.

Solid aluminum capacitors use conductive polymer materials with high electrical conductivity and thermal stability to replace electrolytes. Compared with ordinary liquid aluminum electrolytic capacitors, solid aluminum capacitors have high reliability, long service life, high frequency, low impedance, and large ripple current. The characteristics, and is conducive to the integration of electronic products and miniaturization and can overcome the liquid aluminum electrolytic capacitors easy to leak the drawbacks. Under the background of the effective cost reduction of solid aluminum electrolytic capacitors, the application of solid aluminum electrolytic capacitors in the future should be more and more.

Electrode foil is the most important basic raw material. The most important basic raw material for solid capacitors is the electrode foil. The electrode foil is used to carry the charge, which accounts for 30%-70% of the cost of the capacitor. Electrode foil production mainly undergoes two processes, namely, corrosion and chemical conversion. Corrosion foil is an incomplete form of electrode foil. After chemical conversion, it is the finished form of electrode foil, also called formed foil, and is directly used as a raw material for solid capacitors.

Solid-state capacitor industry technology trends. The development trend of miniaturization and weight reduction of electronic equipment puts higher requirements on the performance of solid-state capacitors. The main technology development trends are: high temperature resistance, long life, high reliability, chip type, miniaturization, and environmental protection. The high specific capacitance and high voltage of electrode foils have become the development direction.