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| nickel–metal hydride battery | |
|---|---|
| Name | Nickel–metal hydride battery |
| Type | Rechargeable battery |
| Invented | 1960s–1980s |
| Developer | Multiple inventors and corporations |
| Nominal voltage | 1.2 V per cell |
| Energy density | 60–120 Wh/kg |
| Lifespan | Several hundred to over a thousand cycles |
nickel–metal hydride battery Nickel–metal hydride cells are rechargeable electrochemical devices used in portable electronics, power tools, and hybrid vehicles. They combine a nickel oxyhydroxide positive electrode with a hydrogen-absorbing alloy negative electrode and were developed through research programs in the United States, Japan, and Europe. The chemistry displaced earlier nickel–cadmium technology in many markets and competed with lithium-ion systems in automotive and consumer segments.
Nickel–metal hydride technology emerged as a successor to nickel–cadmium cells after innovations in electrode alloys, corrosion management, and separator materials by teams at General Electric, Panasonic, Sony, Sanyo, and national laboratories such as Argonne National Laboratory and Lawrence Berkeley National Laboratory. Early commercialization involved collaborations with automakers like Toyota and Honda for hybrid electric vehicles, and consumer electronics manufacturers including Sony Corporation and Panasonic Corporation for cameras and portable equipment. The design balances energy density, cycle life, and safety in contrast to cells developed by Johnson Controls, Eaton Corporation, and other industrial firms.
Research traces to metal hydride studies in the 1960s at institutions such as Massachusetts Institute of Technology and Los Alamos National Laboratory. Development accelerated in the 1970s–1980s with corporate R&D from Hitachi, Matsushita Electric Industrial Co., and Toshiba and academic contributions from Imperial College London and ETH Zurich. Hybrid vehicle deployments in the 1990s involved pilot programs by Toyota Motor Corporation (notably the Toyota Prius project) and field tests by Ford Motor Company and General Motors. Standardization and safety efforts engaged organizations including Underwriters Laboratories and the International Electrotechnical Commission.
The positive electrode uses nickel(III) oxyhydroxide structures derived from research into John B. Goodenough-era transition-metal oxides, with active materials related to those used in cells developed at Bell Labs and studied by researchers at Caltech. Negative electrodes employ hydrogen-absorbing alloys such as rare-earth-based AB5 and AB2 intermetallics produced by companies like Eramet and researched at Oak Ridge National Laboratory. Electrolytes are typically potassium hydroxide solutions optimized through work by chemists at DuPont and BASF. Separator and binder technologies evolved from polymer science contributions at DuPont and 3M Company.
Cells are built in cylindrical, prismatic, and button formats by manufacturers including Sanyo, Panasonic Corporation, and Toshiba Corporation. Manufacturing lines adapted processes from lead–acid and nickel–cadmium production developed at Exide Technologies and Johnson Controls. Techniques for electrode sintering, current-collector bonding, and gas recombination trace to patents filed by corporate laboratories such as Hitachi and national institutions like CEA and NEDO. Thermal management and module integration for automotive packs were engineered in collaboration with Denso Corporation and systems suppliers like Bosch.
Cells typically exhibit nominal voltages around 1.2 V per cell and energy densities in the 60–120 Wh/kg range, competitive with early lithium-ion systems from Sony and Asahi Kasei. Cycle life depends on depth-of-discharge and charge regimes studied in longevity trials at Argonne National Laboratory and Sandia National Laboratories, often reaching several hundred to over a thousand cycles. Self-discharge rates and charge acceptance were improved through electrode coatings and electrolyte additives developed at 3M Company and Sumitomo Chemical. Safety performance under abuse, assessed by standards bodies like Underwriters Laboratories and ISO, shows favorable thermal stability compared with some lithium chemistries.
Commercial applications include hybrid electric vehicles championed by Toyota Motor Corporation and Honda Motor Co., cordless power tools by companies such as Makita and Bosch, and consumer electronics from Sony Corporation and Panasonic Corporation. Stationary energy storage demonstrations involved utilities and research centers like Pacific Gas and Electric Company, National Renewable Energy Laboratory, and municipal pilot projects coordinated with agencies such as California Energy Commission. Aerospace and defense evaluations were performed by contractors including Lockheed Martin and research units at NASA.
Nickel–metal hydride technology reduced reliance on cadmium, leading to lower toxicity concerns compared with nickel–cadmium cells regulated under frameworks influenced by European Commission directives and recycling programs led by Call2Recycle and national schemes in Japan and Germany. Recycling processes recover nickel, cobalt, and rare-earth elements via hydrometallurgical and pyrometallurgical routes developed by firms including Umicore and academic groups at Imperial College London. Lifecycle analyses conducted by researchers at MIT and University of Michigan compare resource use and emissions against lithium-ion and lead–acid systems and inform policy from agencies like the Environmental Protection Agency.
Research continues on improved metal hydride alloys leveraging work at Oak Ridge National Laboratory, Lawrence Livermore National Laboratory, and universities such as Stanford University and University of Cambridge to enhance capacity and reduce rare-earth content. Competing and complementary technologies include lithium-ion variants advanced by Tesla, Inc., solid-state batteries studied at Toyota Research Institute and Samsung SDI, and emerging chemistries from startups incubated by Breakthrough Energy Ventures and institutions like Harvard University. Policy and market factors influenced by bodies such as International Energy Agency and United Nations Environment Programme will shape adoption and recycling infrastructure.
Category:Batteries