Nippon Chemi-Con has been granted a patent for a solid electrolytic capacitor that suppresses dedoping reactions and prevents a sharp increase in ESR (equivalent series resistance) after heat stress. The capacitor includes an electrolyte layer with a solid electrolyte and a liquid, with the liquid filling air gaps in the capacitor element. The electrolyte layer contains ammonia as a cation component, with a molecular ratio of the cation component to the functional group of the dopant being 23 or less. GlobalData’s report on Nippon Chemi-Con gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Nippon Chemi-Con, hydrogen storage alloys was a key innovation area identified from patents. Nippon Chemi-Con's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Solid electrolytic capacitor with ammonia-based electrolyte layer
A recently granted patent (Publication Number: US11657982B2) describes a solid electrolytic capacitor with improved performance. The capacitor includes a capacitor element formed by an anode foil and a cathode foil, as well as an electrolyte layer. The electrolyte layer consists of a solid electrolyte layer containing a dopant and a conjugated polymer, with any air gaps in the capacitor element being filled with a liquid.
One key aspect of the invention is the inclusion of a cation component that includes ammonia in the electrolyte layer. The ammonia is only present in the liquid and not in the solid electrolyte layer. The molecular ratio of the cation component to the functional group of the dopant in the electrolyte layer is 23 or less. Additionally, the ammonia is included in the electrolyte layer in a molar fraction of 0.1 or more of the cation component in the electrolyte layer.
The patent also provides various embodiments and additional details. For example, claim 2 specifies that the molecular ratio of the cation component to the functional group in the electrolyte layer is 11.4 or less, while claim 3 states that it is 6 or less. Claim 4 highlights that the ammonia should be included in the electrolyte layer in a molar fraction of 0.5 or more of all the cation component in the electrolyte layer.
Furthermore, the patent mentions specific materials used in the capacitor. Claim 5 specifies that the dopant is polystyrene sulfonic acid, while claim 6 states that the liquid includes ethylene glycol. Claim 7 adds that at least 50% of the liquid is ethylene glycol.
The patent also includes additional embodiments in claims 9-16, which are similar to the earlier claims but with some variations. For example, claim 9 specifies that the molecular ratio of the cation component to the functional group in the electrolyte layer is 23 or less, while claim 10 states that it is 11.4 or less.
Overall, this granted patent describes a solid electrolytic capacitor with specific compositions and ratios that aim to improve its performance. The inclusion of ammonia in the electrolyte layer and the specific molecular ratios mentioned in the claims contribute to the enhanced functionality of the capacitor.