Zenaji Aeon 1.93 KwH

Lithium titanate technology (Li2TiO3)

Julien from Perma-Batteries' opinion:

The Zenaji Aeon lithium titanate battery is developed and designed in Australia by the Zenaji company since 2019. It has shaken up the lithium battery market for stationary use by choosing LTO chemistry, which has remarkable characteristics, both in terms of safety (the absence of graphite at the anode level makes thermal runaway impossible) and in terms of performance. Capable of delivering more than 20000 cycles at 100% of DOD in rapid discharge (1C), its unique chemical configuration gives it extremely low degradation over time, due to the absence of SEI formation on the surface of the 'anode, thus avoiding the known failure modes on LFP or NMC type batteries. Zenaji assembles 66160 cells of 40Ah in series to obtain a vertical pack of 39 Kg, equipped with an extremely robust aluminum casing 3mm thick IP65, resistant to extreme temperatures (from -20 to + 60 ° C). Putting these modules in parallel makes it possible to obtain systems up to several tens of kWh, without limit of extension in time. The other unique feature of Zenaji batteries lies in their internal management. Equipped with a BMS, the latter does not communicate with the battery inverter and only manages the cell parameters internally, thus allowing great flexibility in terms of compatibility with the electronics and system robustness comparable to “low-” batteries. unsupervised tech ”(Nickel-Iron). It is therefore a foolproof lithium battery, expensive, but which will give the assurance of delivering a constant performance over time, without maintenance, and in complete peace of mind ”.

 

LTO chemistry: the elite of lithium batteries:

 

In most current lithium batteries (LFP or NMC), the stress imposed on the anode structure by the change in thickness of the anode material caused by the lithium-ion intercalation / deintercalation phenomena accompanying the charge / discharge influences the battery life. In particular, the relatively large increase in the carbon / graphite thickness of the anodes caused by repeated charging / discharging, implies an irreversible degradation of the capacity of the cells. On the other hand, with this technology, the much smaller increase in thickness of its LTO anode with a solid crystal structure greatly reduces the degradation of the capacity, despite repeated charge / discharge cycles. This ensures a battery with an extremely long lifespan.

Source: Toshiba SCIB internal documentation (2017)

 

 

Cycling curve given at 2C / 100% DOD 

Source: Yinlong internal documentation 

 

100% safe operation: 

The use of an LTO anode provides safety protection against internal short circuits. In the event of a short circuit, instead of a rapid rise in temperature associated with discharges in the carbon anodes, the Zenaji Aeon battery exhibits a limited rise in temperature. In fact, in the event of mechanical failure (shock, fire, etc.), the LTO cell, a conductive material, turns into a material of low conductivity, thus acting as a "brake" on the chemical chain reaction that is being carried out. can be observed on the thermal runaways of conventional lithium batteries.

 

Source: Toshiba SCIB internal documentation (2017)

 

Video demonstrating thermal stability of a lithium titanate cell used in Zenaji Aeon batteries:

 

An Australian design and manufacture:

The Zenaji Aeon battery is a leap forward in residential batteries, with its innovative new renewable energy storage system based on Lithium Titanate, or LTO. Founded by Dawson Johns and Charles Van Dongen, the Australian company has grown into a multidisciplinary team. Over the past three years, Zenaji engineers, physicists and salespeople have worked with LTO battery cell manufacturers on the design, manufacture and commercialization of the new long-term energy storage solution, achieving “ remarkable results by increasing energy density and reducing costs. "

Zenaji AEON battery solution has a guaranteed lifespan of 22 cycles for 000% capacity, which they claim is at least six times that of NMC and LFP solutions (typically 80 to 6000 cycles) . The system is described as having the ability to be 8000% deep unloaded and scalable to meet different demands and needs. “While the initial cost may be more expensive than other lithium batteries such as LIPO (Lithium Iron Phosphate), the recognized problem with them and NMC (Nickel Manganese Cobalt) is that they cannot be deeply discharged and cannot have a lifespan of approximately 100-3000 cycles before falling below the threshold of 6000%. They only last eight to ten years in a solar system and only if they are not used every day and their level of discharge is limited. In contrast, he says, the return on investment of the Zenaji LTO battery is good - most will never have to replace the battery, ”he said, hence the 70-year warranty.

 

This means recycling is less of a problem since the battery won't need to be replaced, Johns said. Currently the battery is assembled overseas, but one day they hope to be able to move operations to Australia, with the right incentives. Already with clients already in South Africa and the United States, the reach continues to grow, with interest in the United Kingdom, Scandinavia and New Zealand.

 

LTO (Zenaji) vs NMC / LFP comparison table:

 

 

Comparison of the average lifespan between Lead-Li-ion-LTO: 

 

Register your Zenaji batteries online with your serial numbers at:

https://www.cognitoforms.com/ZenajiPtyLtd/ZenajiBatteryInstallRegistration

 

Exhaustive technical documentation available on our wiki:

https://www.notion.so/perma-batteries/Documentation-ressources-techniques-batteries-Zenaji-6c77a5ed474c4246905ed4804eaf2a3a