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Talga Anode Outperforms Commercial Li-ion Cells In Electric Vehicle Endurance Test

Posted By Graphene Council, The Graphene Council, Thursday, March 28, 2019
Updated: Thursday, March 28, 2019
Talga Resources, is pleased to announce further results from development of its active graphite anode product for lithium-ion batteries, Talnode™-C.

Talnode-C is currently undergoing full-cell qualification with a range of technical and commercial partners as it progresses through validation processes. In new tests conducted by IV Electrics, formerly known as Italian Volt and manufacturer of the “Lacama” electric motorcycle, Li-ion batteries fabricated with Talnode-C anodes were subjected to benchtop tests designed to replicate extreme real world conditions and ensure high performance of the Lacama battery pack.

One of these tests is named ‘Stelvio’, after the famously steep road through the Italian Alps and simulates driving up a mountain at high speed. This cyclic test checks the ability of a battery to efficiently collect fast charge regenerative current (from braking) after a high-power discharge (acceleration) in low temperature conditions. Results in running time represents battery cell performance before limits in voltage drop or cell temperature force the end of the test.

Results show that Talnode-C containing battery cells outperform the endurance of market leading commercial cells by up to 36%. Furthermore, the tests confirm the fast charge, high power, and low temperature properties of Talnode-C anodes translate well to the full cell-level.

In effect this means that a battery pack manufactured with Talnode-C may need less thermal management and materials, reducing cost and weight, while increasing energy density (and therefore driving range) and safety of the battery pack.

Talga Managing Director, Mr Mark Thompson: “We are delighted that Talga’s Li-ion battery anode material has proven itself again in tests for a premium electric vehicle manufacturer such as IV Electrics and their high performance Lacama. We look forward to further development of our premium range of Li-ion battery products utilising Talga anode material technology and the unique intrinsic properties of our Swedish mineral resources.”

Talga staff will be presenting recently published performance results of TalnodeTM products at the International Battery Seminar in Ft. Lauderdale, Florida on 28 March Australian time.

Tags:  Graphene  Graphite  IV Electrics  Li-ion batteries  Mark Thompson  Talga Resources 

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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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Further gains from Talga high energy battery anode product

Posted By Graphene Council, The Graphene Council, Tuesday, February 19, 2019
Updated: Tuesday, February 19, 2019

Australian advanced materials technology company, Talga Resources is pleased to announce further test results from its high energy graphene silicon lithium ion ("Li-ion") battery anode product Talnode™-Si.

Following initial test results (Oct 2018) further optimisation of Talnode-Si, with up to 15% silicon loading, has been underway at Talga's battery material facility in the Maxwell Centre of Cambridge University, UK. Highlights of new half cell cycling test results include:

• ~70% higher reversible capacity (~600mAh/g) than commercial graphite (~350mAh/g)*

• Coulombic efficiency of 99.5% - 99.9% with first cycle efficiency ~ 91%

• Up to 94% reversible capacity (after >130 cycles in a range of silicon loadings)

Talga Managing Director, Mr Mark Thompson: "The rapid development of our natural graphite anode products for Li-ion batteries have been extraordinary and the continued positive market response to products under development, Talnode-Si and Talnode-X, as well as our flagship product, Talnode-C, support plans for scaling up of Talnode products as part of our vertically integrated business strategy."

Moving Forward

Talnode-Si consists of a mixture of silicon and graphene particles engineered by Talga to be suitable for existing Li-ion battery manufacturing equipment as a high performance, cost-effective and scalable replacement for standard graphite anode materials. Commercial samples are being prepared, under confidentiality and material transfer agreements, with delivery commencing end of February 2019. Recipients include some of the world's largest electronics companies.

Development continues under the Safevolt project, a part of the £246 million UK-funded Faraday program, with Talga partners Johnson Matthey, Cambridge University and TWI. Based on the encouraging test results to date the Company has opted to progress to full cell testing and optimisation of Talnode-Si. Progress on the other Faraday projects, "Scale-up" and "Sodium" is continuing according to plan and updates will be provided as the programs proceed through their individual project stages.

Tags:  batteries  Graphene  Li-ion batteries  Mark Thompson  Talga Resources 

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