Wang Jin

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Bio

Dr. Wang obtained bachelor degree from Peking University in 2008, and subsequently accomplished his PhD degree at the University of Utah in 2014. Since 2015, he conducted postdoc research at Baylor University, Moffitt Cancer Center and University of South Florida. In 2019 Dr. Wang was recruited as “excellent young scholar” by Shandong Normal University and started his independent research as an associate professor there. Since 2020, he has served as the chief expert of Shandong Jinkeli Power Sources Technology Co., Ltd. His research interest focuses on synthetic organic methodology and electrochemical synthesis, and seminal works have been published on journals such as Angew. Chem. Int. Ed., Org. Lett., Org. Chem. Front., Chem. Eur. J., with several patent granted or under review. In 2020, the project “Novel Electrolyte Additives for Low-Temperature Performance” which was led by Dr Wang and supported by Jinkeli has been sponsored by “Highly Demanded Experts for Selected Regions in Shandong” program. He has also been awarded “excellent young scholar” by SDNU and was the winner of the Zibo Innovation and Entrepreneurship Competition.


Organic electrolyte additives for improving low - temperature performances of lead acid batteries
Wang Jin, Shandong Jinkeli Power Sources Technology Co, China

Co-authors: Wang Houwen, Geng Wenzhe, Lu Chuanbiao, Cao Guifa

Nowadays lead acid battery (LAB) continue to provide solutions in newer applications such as start stop automotive power sources, low speed electric vehicles and energy storage. The capability for LAB to maintain satisfactory performance and life time under low temperatures has become a key element of successful utilization of this technology. Additives in positive active mass and negative active mass have been well investigated and some have been broadly adopted in LAB manufactory process. On the other hand , electrolyte additives have only received limited attention . Besides sodium sulfate which is the most popular electrolyte additive, other inorganic acids and salts have also been reported . However, organic electrolyte additives, which presents much broader structural and functional diversity, have been largely overlooked. Over the last four years, we have conducted systematic screening of various organic compounds as electrolyte additives. Based on different functionalities, more than 200 organic structures including ammonium salts, amines, heterocycles, sulfonic acids, organometallic salts, carboxylic acids and alcohols have been tested. Among them organic sulfonic acids such as benzenesulfonic acid improved low temperature charge receptance as well as low temperature capacity and discharge time dramatically, while maintaining ambient temperature performance and life cycle performance . This may be due to surface interaction of the sulfonic additive with lignin sulfonates, which helps electron and mass transfer during charge/discharge process. By combining organic sulfonic acid with other inorganic sulfate salts, we have developed a new composite electrolyte additive formula which greatly promote low temperature performance of LAB . Our preliminary investigation also showed that adding organic aluminum salt such as aluminum acetylacetonate is beneficial to low temperature charge acceptance; additionally we have found organic carboxylic acids and alcohol additives increase low temperature capacity. We are currently conducting comprehensive electrochemical test and surface analysis to understand the detailed mechanism lies in the effect of different organic electrolyte additives.