nickel-metal hydride batteries

nickel-metal hydride batteries are a type of rechargeable battery that has been widely used in hybrid electric vehicles such as the Toyota Prius, Honda Civic Hybrid, and Ford Escape Hybrid. They are also used in portable electronics like laptops, cameras, and cordless power tools from companies like Black & Decker, Bosch, and Makita. The development of nickel-metal hydride batteries involved the work of Stanford University researchers, including Stanford R. Ovshinsky, who founded Energy Conversion Devices to commercialize the technology. This innovation was recognized with the National Medal of Technology and Innovation, awarded to Ovshinsky in 2010, and also involved collaborations with General Motors, DaimlerChrysler, and Ford Motor Company.

Introduction

Nickel-metal hydride batteries have a number of advantages, including high energy density, long cycle life, and relatively low self-discharge rates, making them suitable for use in electric vehicles like the Nissan Leaf and Chevrolet Volt. They are also used in solar-powered systems, such as those installed by SunPower and Trina Solar, and in wind turbines manufactured by Vestas and Siemens Gamesa. The batteries are designed to be more environmentally friendly than nickel-cadmium batteries, which contain toxic cadmium, and have been supported by organizations like the Environmental Protection Agency and the European Union. Companies like Panasonic, Sanyo, and LG Chem have developed nickel-metal hydride batteries for various applications, including consumer electronics and industrial power systems.

History

The development of nickel-metal hydride batteries began in the 1970s, with researchers at Stanford University and Energy Conversion Devices working on the technology. The first commercial nickel-metal hydride batteries were released in the 1980s, and they quickly gained popularity for use in portable electronics and electric vehicles. The United States Department of Energy and the National Renewable Energy Laboratory have supported research and development of nickel-metal hydride batteries, and companies like General Electric and 3M have also contributed to the technology. In the 1990s, nickel-metal hydride batteries became widely used in hybrid electric vehicles, with the Toyota Prius being one of the first mass-produced models to use the technology, and have since been used in vehicles from Honda, Ford, and Kia Motors.

Chemistry

Nickel-metal hydride batteries consist of a nickel oxide hydroxide positive electrode, a metal hydride negative electrode, and a potassium hydroxide electrolyte. The chemical reaction that occurs during discharge involves the oxidation of the metal hydride and the reduction of the nickel oxide hydroxide, resulting in the release of electricity. The batteries are designed to be rechargeable, with the chemical reaction reversing during charging, and have been studied by researchers at Massachusetts Institute of Technology, California Institute of Technology, and University of California, Berkeley. Companies like BASF and Dow Chemical Company have developed materials used in the production of nickel-metal hydride batteries, and organizations like the American Chemical Society and the Electrochemical Society have supported research in the field.

Applications

Nickel-metal hydride batteries are used in a wide range of applications, including electric vehicles, hybrid electric vehicles, and portable electronics. They are also used in solar-powered systems and wind turbines, and have been installed by companies like Tesla, Inc. and Vivint Solar. The batteries are suitable for use in power tools and garden equipment, and have been manufactured by companies like DeWalt and GreenWorks Tools. Additionally, nickel-metal hydride batteries are used in medical devices like pacemakers and implantable cardioverter-defibrillators, which are produced by companies like Medtronic and Boston Scientific.

Comparison_to_other_batteries

Nickel-metal hydride batteries have a number of advantages and disadvantages compared to other types of batteries, such as lithium-ion batteries and lead-acid batteries. They have a higher energy density than lead-acid batteries, but a lower energy density than lithium-ion batteries, which are used in devices like the Apple iPhone and Samsung Galaxy. Nickel-metal hydride batteries also have a longer cycle life than lead-acid batteries, but a shorter cycle life than lithium-ion batteries, which are manufactured by companies like LG Chem and Samsung SDI. Companies like A123 Systems and Ener1 have developed lithium-ion batteries for use in electric vehicles and renewable energy systems.

Environmental_concerns

Nickel-metal hydride batteries contain toxic materials like nickel and cadmium, which can pose environmental and health risks if not disposed of properly. The European Union has implemented regulations to limit the use of toxic materials in batteries, and companies like Recycling Technologies and Umicore have developed recycling programs for nickel-metal hydride batteries. Organizations like the Environmental Defense Fund and the World Wildlife Fund have supported efforts to reduce the environmental impact of battery production and disposal, and companies like Tesla, Inc. and Volkswagen Group have committed to using more sustainable materials in their products. Category:Batteries