Kousuke Hagiyama

Title: Kousuke Hagiyama: Innovator in Non-Aqueous Electrolyte Secondary Batteries

Introduction

Kousuke Hagiyama is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the field of battery technology, particularly in the development of non-aqueous electrolyte secondary batteries. With a total of 6 patents to his name, his work has been influential in enhancing battery performance and durability.

Latest Patents

Hagiyama's latest patents include a method for producing a non-aqueous electrolyte secondary battery. This method involves an electrolyte containing an electrolyte salt, a non-aqueous solvent, and multiple additives. Notably, at least one of these additives has a reduction potential that is nobler than that of the non-aqueous solvent. The method consists of a first charging step that maintains battery voltage at a negative electrode potential, allowing for the decomposition of the additive with the noblest reduction potential while preventing the reduction of the non-aqueous solvent and other additives. A second charging step is designed to facilitate the reduction and decomposition of at least one of the non-aqueous solvents, ensuring the electrical potential of the negative electrode reaches at least 0.7 V relative to lithium. This innovative approach helps suppress durability decreases by promoting a uniform reaction within the electrode.

Another significant patent by Hagiyama is for a non-aqueous electrolyte secondary battery and its manufacturing method. This invention provides a battery with improved characteristics and involves accommodating and sealing a flat battery element, which includes a positive electrode plate and a negative electrode plate stacked together via a separator. The assembly is combined with a non-aqueous electrolyte that includes a surplus electrolyte and at least one kind of electrolyte additive, all sealed within a laminate film exterior member. The manufacturing method includes charging the assembled battery while applying pressure to its flat surface from outside the exterior member.

Career Highlights

Throughout his career, Kousuke Hagiyama has worked with notable companies, including Nissan Motor Company Limited and Automotive Energy Supply Corporation. His experience in these organizations has contributed to his expertise in battery technology and innovation.

Collaborations

Hagiyama has collaborated with esteemed colleagues such as Osamu Shimamura and Fumihiro Kawamura. Their joint efforts have further advanced the field of battery technology and innovation.

Conclusion