LR6 battery

This new technology can make power LR6 battery have both high energy density and high power density

In recent years, my country's electric vehicle industry has developed rapidly due to the dual "favor" of policies and markets, but electric vehicles also have their own anxieties, such as short driving range, long charging time, low number of cycles, and safety issues are still prominent. Hydrogen fuel cell vehicles have gradually become another focus of local governments in my country to promote new energy vehicles due to their long driving range, short hydrogen refueling time, and cleaner and more environmentally friendly. At present, Shanghai, Guangdong, Xi'an, Shaanxi, Rugao, Jiangsu, Taizhou, Zhejiang, Wuhan, Hubei, Datong, Shanxi and other places have successively introduced relevant policies or measures to support the development of the fuel cell industry. However, hydrogen fuel cells are not without their own pain points, such as the high cost of hydrogen production, storage and transportation, large investment in hydrogen refueling station construction, and slow progress in hydrogen fuel cell technology research and development, which have always plagued the development of hydrogen fuel vehicles. Other fuel cells with higher cost-effectiveness and economic benefits have also been the focus of enterprises and scientific research institutions.

Recently, Battery China Network learned from the Chinese Academy of Sciences that the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences has made new progress in the research of fuel cell and supercapacitor composite power sources, achieving both high power density and high energy density of chemical power sources, and providing new research ideas for the development of the next generation of high specific energy characteristics chemical power sources.

It is understood that fuel cells have high energy density, but their power density is low due to the slow kinetics of liquid fuel electro-oxidation and oxygen electro-reduction reactions; while supercapacitors have high power density, but are limited by the specific capacity of electrode active materials, and their energy density is low. At present, most chemical power sources are difficult to have both high power density and high energy density. The team of the institute innovatively designed and constructed a new dual-effect electrode based on pseudocapacitive material polyaniline and electrocatalytic material Pt/C (cathode) or PtRu/C (anode), thereby constructing an in-situ direct methanol fuel cell and supercapacitor composite power source. The composite power source uses the characteristics of polyaniline that can undergo oxidation/reduction state transition in the potential range of cathode (oxygen electro-reduction reaction) and anode (methanol electro-oxidation reaction) to achieve in-situ self-charging of supercapacitors. Thanks to the rapid pseudocapacitive discharge characteristics of polyaniline, the pulse discharge performance of the composite power source is greatly improved, and the power density of the single cell can reach 4kW/kg, which is more than 80% higher than that of the traditional simple methanol fuel cell. At the same time, the continuous supply of methanol ensures the high energy density of the composite power source.

The pseudocapacitor and electrochemical reaction coupling mechanism explained in this work provides a new research idea for the next generation of high-specific characteristics chemical power sources. The relevant research results were published in ACS Energy Letters.

Although hydrogen fuel cell vehicles have attracted the attention of many car companies and the focus of fuel cell vehicle research and development is on hydrogen fuel cells, some car companies are willing to invest heavily in the research and development of other fuel cell vehicle technologies. In August this year, the British Ceres Power Company announced a partnership with Nissan Motor. In the future, the two parties will jointly develop fuel cells that can efficiently generate energy using traditional fuels such as natural gas and sustainable fuels such as biogas, ethanol or hydrogen. The project also received £35 million in funding from the British government. It is reported that the British Ceres Power Company is the developer of SteelCell's low-cost solid oxide fuel cells. Ceres Power said that SteelCell solid oxide fuel cells are made of high-volume and widely available materials, are cost-effective, powerful and scalable. The project with Nissan involves designing, building, testing and demonstrating solid oxide fuel cell stacks produced by Ceres Power, which will be deployed in Nissan-designed fuel cell modules suitable for various high-efficiency fuel types, including biofuels.

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