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Talga Anode Achieves Outstanding Freezing Temperature Performance

Posted By Graphene Council, The Graphene Council, Saturday, March 23, 2019
Talga Resources , ispleased to announce outstanding low temperature test results from its engineered graphite anode product for lithium-ion batteries, Talnode™-C.

Development of Talnode-C is accelerating through rigorous commercial validation processes at multiple commercial partner facilities and independent battery institutes in Asia, USA and Europe. In new tests conducted at a leading Japanese battery institute, Li-ion batteries using Talnode-C were subjected to performance tests under a range of temperatures including freezing conditions. Highlights of the test results include:
• Retention of 100% capacity and 100% cycle efficiency at freezing temperature (0°C)
• Out-performance of market leading commercial anode products

In freezing conditions Li-ion batteries usually suffer lower capacity retention and cycling efficiency, causing shorter run time of devices such as laptop computers and mobile phones, or shorter driving range of electric vehicles. Cold temperatures can also cause deposits of lithium metal to form in the battery, causing internal short circuits that can lead to fire in the cell, making low temperature performance a critical technical deliverable for Li-ion batteries1.

Talga Managing Director, Mr Mark Thompson: “These results show Talnode-C has the potential to solve problems that have long challenged Li-ion batteries in cold weather applications, where conventional graphite anodes struggle or fail to perform. This is a further demonstration that Talga’s anode products made from our high grade graphite deposit in Sweden, using wholly owned process and refining technology, have exciting potential in the fast growing Li-ion battery market.”

Moving Forward
Market validation of the TalnodeTM product range, and in particular the flagship Li-ion anode product Talnode-C, continues as Talga works to incorporate the development of its new class of high-performance graphitic carbon anode products into its long-term business strategy.

Advanced testing and validation, including the surface treatment and coating of Talnode-C, progresses across multiple commercial partner facilities and independent battery institutes in Asia, USA and Europe. It is expected that Talnode-C, a fully engineered and formulated active anodeready product to be marketed directly towards Li-ion battery manufacturers, will form the
foundation of a near-term commercialisation opportunity for the Company’s larger scale development of the Vittangi graphite project in Sweden.

Low Temperature Technical Background
Li-ion batteries are widely used at room temperature because of their high specific energy and energy density, long cycle life, low self-discharge, and long shelf life2. When charging a Li-ion battery, the lithium ions inside the battery are soaked up (as in a sponge) by the porous negative electrode (anode), made of graphite.

Under temperatures approaching freezing (0°C) however, the lithium ions aren’t efficiently captured by the anode. Instead, many lithium ions are reduced to lithium metal and coat the surface of the anode, a process called lithium plating, resulting in less lithium available to carry the flow of electricity. Consequently, the battery’s capacity and cycle efficiency drops and this translates to poorer performance3.

In cooler countries of the northern hemisphere, it has been measured that the driving range of electric vehicles can be reduced by 41% in real world sub-zero conditions4. The most significant negative effect of low temperature on Li-ion batteries is the generation of lithium metal growths called dendrites, which can perforate the separator and cause a short circuit or fire in the lithium-ion cells. A highly visible example of this was in the 2013 grounding of Boeing 787 Dreamliner aircraft following a spate of electrical system failures, including fires. Investigation found that cold winter overnight temperatures fostered lithium plating within the battery cells and caused the short circuits5.

Tags:  Graphene  Li-ion batteries  Mark Thompson  Talga Resources 

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