Accumulator nickel-zinc

An accumulating Nickel - Zinc (of NiZn abbreviation) is a secondary generator (refillable) Alcalin (like the NiCd and the NiMH).

General information

NiZn was from time immemorial regarded as an accumulator with the very gravitational characteristics, been dependant on its Anode of zinc (potential very negative redox, strong mass capacity, low costs, abundance of the component, not toxicity, and facilitated recycling).

However, of many attempts of development and marketing failed, because of a too weak aptitude for the cycling of the technologies then implemented.

They are fast phenomena of modifications of the structure of the electrode of zinc which are at the origin of this very short operation life.

During the discharge of the accumulator, zinc, negative active matter, are oxidized out of nonconducting zinc oxide and soluble potassium zincate in the electrolyte.

In refill, these products of oxidation are reduced out of metal zinc, which is redistributed in an irregular way in the electrode, and generates wrongly qualified anarchistic growths the “dendritic ones”, leading to the setting in Court-circuit accumulator.

This problem is completely solved today by a new technology developed in France between 1998 and 2005.

General characteristics

  • Excellent aptitude for cycling, including in major cyclings

  • Great lifespan in storage
  • High energy specific
  • Strong powers delivered
  • Aptitude for the high modes of load and discharge
  • Fonctionnement without maintenance
  • Broad range of operating temperatures (of -20°C with +60°C)
  • Résistance interns very weak
  • Grande robustness of the system (including in overload or surdécharge)
  • Grande operational safety under all the condition of uses
  • Pas of heavy metals, not of unstable compounds
  • easy, economic and complete Recyclage at the end of the lifetime
  • moderate Coût: weakest of all the accumulators except for the lead accumulator

Disadvantages: In old technologies:

  • heavy and bulky
  • strong rate of autodécharge
These problems are solved today:
  • 65 to 80 Wh/kg and 120 to 140 Wh/dm3
  • autodécharge limited

Features

Nominal voltage: 1,65 Volt.

Operation without maintenance.

Lifespan in cycling:

  • > 1000 cycles with the mode of C/5 (load and discharge), with 100% of depth of discharge
  • > 1000 cycles with the mode of C/3 (load and discharge), with 80% of depth of discharge

Specific energy: up to 80 Wh/kg and 140 Wh/dm3

Power:

  • > 700 W/kg in prismatic versions of energy (types 30 to 50 Ah)
  • > 1000 W/kg in prismatic versions of power (types 6 to 9 Ah)

Possible operation in pulsated cycling.

Possible operation in floating.

Scopes of application

Industrial applications:
  • safety and storage (stationary applications)
  • traction of special and professional electric vehicles, and of light electric vehicles
  • equipment of particular, utility and military hybrid vehicles
  • accompaniment-storage of decentralized renewable energies
Portable applications of power:
  • tools without wire
  • toys

See too

Random links:Clelles | List weapons of the First World War | Arrone | Therese Desqueyroux (film) | Joe_Loeffler