UHPC Education

Ultra-High Precision Coulometry 101

Benefits of UHPC technology

Accurate Measurements

Allows accurate measurements of electrochemical processes within a cell. This enables non-destructive understanding of how battery chemistry is changing from cycle-to-cycle

Measure Coulombic Efficiency, up to five significant figures, to enable reliable comparisons of cells in a fraction of the time that it would take on other cyclers

Unique Observations

Observe cycle metrics unique to ultra-high precision, such as end-point capacity slippage

Precise Evaluation

Evaluate active material loss, lithium inventory loss, electrolyte oxidation and more

Benefits of NOVONIX equipment

Applications

NOVONIX UHPC systems are fully capable battery cyclers that deliver data in ultra-high precision. This equipment enables creative scientists and engineers to understand their cells in parts per million level of precision.

NOVONIX UHPC systems can be used in a number of applications, including:

Materials Evaluation

Customers working on new materials can utilize UHPC testing to understand how changes to physical properties such as morphology, particle size distribution, surface area, etc. impact the battery performance.

Cell Selection

When conducting cell selection between vendors or cell models, the ability to gather cell performance data at high accuracy in a short time is critical, especially when experiments have many dimensions (temperature, current, voltage windows, cells, etc.).

Environmental Performance Evaluation

Environmental conditions matter when testing cell performance. Learn how cells perform in extreme conditions and minimize failure mechanisms through accurate analysis of metrics such as charge endpoint capacity slippage (caused by electrolyte oxidation, transition metal dissolution, self discharge, and more).

Manufacturing Process Development

Tune process parameters on new or existing production lines – for new or existing recipes – and guarantee the repeatability of a manufacturing process to quickly gain confidence in the process.

Battery Management Optimization

Clearly understand the electrochemical response of a cell and develop charge strategies under different environmental or use conditions.

Coulombic Efficiency (CE) revealed

Coulombic Efficiency (CE) is the single most important metric when projecting the future performance of a battery. It describes the charge efficiency by which electrons are transferred to batteries to create a charge.

Another way to put it is “How much of what is put in, is returned back out?”. After all, that’s the job of a battery; to store energy so that it can be used to get work done at a later time and place, on demand. The more a battery can give back of what is put in, the better that battery should be. This is Coulombic Efficiency (CE).

Lower Coulombic Efficiency (CE), longer potential lifespan

If we look at how a waterwheel is powered with each full cycle, over time there is some water loss which represents lithium ions that are lost during the charge and discharge cycles. The least amount of water loss or lithium-ion loss during the cycles, the closer the CE is to 1 and the longer the potential lifespan of a battery.

The NOVONIX UHPC system measures how much reversible capacity is lost cycle-to-cycle, even in very small amounts. This is why with UHPC equipment, it is so important to be able to get very precise and accurate measurements. Customers can gain insight into degradation mechanisms within a cell and allow quantitative comparisons between cells after only a fraction of their cycle life. 

Look below to explore Coulombic Efficiency in more detail with our 4-part blog series.

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