Modern NiMH rechargeable cells 60–120 Wh/kg 140–300 Wh/L 250–1,000 W/kg Charge/discharge efficiency 66% –92% Self-discharge rate 13. Sin Cara. 9–70.6% at 36.4–97.8% at 45 °C Low self-discharge: 1.3–2.9% at 20 °C (per month) Cycle durability 180 –2000 Nominal cell voltage 1.2 V A nickel–metal hydride battery, abbreviated NiMH or Ni–MH, is a type of. The chemical reaction at the positive electrode is similar to that of the (NiCd), with both using (NiOOH). However, the negative electrodes use a hydrogen-absorbing instead of.

A NiMH battery can have two to three times the capacity of an equivalent size, and its can approach that of a. See also: Work on NiMH batteries began at the -Geneva Research Center following the technology's invention in 1967. It was based on Ti 2Ni+TiNi+x alloys and NiOOH electrodes. [ ] Development was sponsored over nearly two decades by and by within Deutsche Automobilgesellschaft, now a subsidiary of. The batteries' specific energy reached 50 Wh/kg (180 kJ/kg), power density up to 1000 W/kg and a life of 500 (at 100% ). Applications were filed in European countries (priority: Switzerland), the United States, and Japan.

The patents transferred to Daimler-Benz. Interest grew in the 1970s with the commercialisation of the for satellite applications. Hydride technology promised an alternative, less bulky way to store the hydrogen. Research carried out by and France's developed new high-energy hybrid alloys incorporating for the negative electrode. However, these suffered from alloy instability in and consequently insufficient cycle life. In 1987, Willems and Buschow demonstrated a successful battery based on this approach (using a mixture of La 0.8Nd 0.2Ni 2.5Co 2.4Si 0.1), which kept 84% of its charge capacity after 4000 charge–discharge cycles.

Dimension F is the free-blade area, which is the space between the bottom of the mouth and the surface of the shoulder. This space affects the freedom of movement of fibres in the wire as well as the aerodynamics of the process. The setting gaps between card rollers typically range from about 0.27 mm to 0.70 mm.

More economically viable alloys using instead of were soon developed. Modern NiMH cells were based on this design. The first consumer-grade NiMH cells became commercially available in 1989.

In 1998, improved the Ti–Ni alloy structure and composition and patented its innovations. In 2008, more than two million hybrid cars worldwide were manufactured with NiMH batteries.

In the European Union and due to its, nickel–metal hydride batteries replaced Ni–Cd batteries for portable consumer use. Aspekte Mittelstufe Deutsch B2 Pdf To Word. About 22% of portable rechargeable batteries sold in Japan in 2010 were NiMH.

In Switzerland in 2009, the equivalent statistic was approximately 60%. This percentage has fallen over time due to the increase in manufacture of batteries: in 2000, almost half of all portable rechargeable batteries sold in Japan were NiMH. In 2015 produced a modified microstructure that helped make NiMH batteries more durable, in turn allowing changes to the cell design that saved considerable weight, allowing the gravimetric energy density to reach 140 watt-hours per kilogram. Electrochemistry [ ]. This section needs additional citations for. Unsourced material may be challenged and removed.

(July 2015) () The negative electrode reaction occurring in a NiMH cell is H 2O + M + e − ⇌ OH − + MH The charge reaction is read left-to-right and the discharge reaction is read right-to-left. On the positive electrode, nickel oxyhydroxide, NiO(OH), is formed: Ni(OH) 2 + OH − ⇌ NiO(OH) + H 2O + e − The metal M in the negative electrode of a NiMH cell is an compound.