Silicon is a highly desirable anode material for EV batteries as it has over nine times the energy density of current graphite anodes, allowing for faster charging rates. Significantly changing the energy density of a battery, silicon anodes close the gap in cost, charging time, and driving range between EV and ICE vehicles.
Automakers are committed to using silicon in batteries.
“Silicon is awesome and inexpensive,” as was stressed during the Tesla Battery Day 2020 presentation.
“It is necessary to change the cell chemistry from graphite to silicon…higher energy density, lower lithium plating, faster charging,” said Oliver Blume, Chairman of the Executive Board, Porsche AG at Volkswagen Power Day 2021.
“… silicon can connect more lithium ions than just the graphite” was stated at Volkswagen Power Day 2021 by Frank Blome, Head of Business Unit Battery Cell and System at Volkswagen Group Components.
There is a fundamental and unresolved problem with silicon related to its expansion during battery charging and discharging, which leads to cracking and loss of contact between the silicon material particles.
As a result, a battery with silicon goes out of service very quickly. This problem made it impossible to use silicon, the best material in terms of energy density, in the formulations of modern Li-ion batteries.
TUBALL™ graphene nanotubes cover the surface of the silicon particles and create highly conductive and durable connections between them. These connections are so dense, long, conductive, and strong that even when the silicon particles in the anode expand and the material starts to crack, the particles stay well connected to each other through the TUBALL™ graphene nanotubes.
This prevents the anode from going out of service—the hugely improved cycle life is enough to meet even the strictest EV manufacturer requirements.
When added to the silicon anode, graphene nanotubes bind silicon particles together, even during their expansion, and maintain electrical connection. This prevents battery degradation.
How do nanotubes work inside an electrode?
Electric car rEVolution: why graphene nanotubes will be inside next-gen batteries
TUBALL™ 제품은 실리콘 양극의 핵심 문제를 해결할수 있는 유일한 솔루션입니다.
TUBALL™ networks solve the key problem of silicon-based anodes and substantially increase their cycle life up to 4x. TUBALL™ batteries with high silicon content can meet strict EV/Electronics industry requirements on cycle life.
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The usage of TUBALL™ in high-energy silicon anodes becomes the industry standard
주요 리튬이온전지 생산업체들은 TUBALL™ 그래핀 나노튜브를 적용하여 내부에 20% SiO, 600 mAh/g 용량, 1500회 이상의 수명을 가진 양극을 만들 수 있음을 입증했습니다.
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배터리 설계에서 높은 실리콘 함량의 양극을 활용함으로써, 기록적인 배터리 에너지 밀도(300Wh/kg 및 800Wh/l)를 달성할 수 있습니다.
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OCiAl R&D 팀은 양극의 SiO 함량을 90%까지 증가시킬 수 있다는 것을 입증했으며, 이 결과는 에너지 밀도가 350 Wh/kg & 1350 Wh/l 까지 향상될 것을 의미합니다.
TUBALL™ BATT – 실리콘 기반 양극에 적용할 수 있는 사용이 용이한 제품
TUBALL™ BATT H2O 제품은 Si/C 양극의 핵심 문제를 효율적으로 해결할 수 있는 TUBALL 그래핀 나노튜브 분산 제품입니다. TUBALL 그래핀 나노튜브는 Si/C 양극에0.05% 만 소량 첨가해도 탁월한 전도도를 구현합니다. Si/C 양극에 첨가하면, TUBALL BATT H2O는 배터리 충전 및 방전 과정에서 Si/C 양극 입자를 완전히 커버하면서도 전기적으로 연결합니다.
TUBALL™ BATT에 대한 자세한 내용은 아래 제품 카드를 클릭하거나 문의해 주시기 바랍니다.
Electric car rEVolution: why graphene nanotubes will be inside next-gen batteries
How do nanotubes work inside an electrode?
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The pitch-derived soft carbon and SWCNTs provided an excellent conductivity, and the porous structure of the composite accommodated the stress produced by the Si expansion.
The all‐nanomat full cell shows exceptional improvement in battery energy density – 479 Wh/kg battery, and Si-anode capacity – 1166 mAh/g.
High thickness and specific capacity leads to areal capacities of up to 45 and 30 mAh cm−2 for anodes and cathodes, respectively. Combining optimized composite anodes and cathodes yields full cells with state-of-the-art areal capacities (29 mAh cm−2) and specific/volumetric energies (480 Wh kg−1 and 1,600 Wh l−1).
Areal capacities greater than 10 mAh/cm2 and volumetric capacities greater than 1400 mAh/cm3 can be achieved.
The use of SWCNT conductive additive enables graphite-free SiO electrodes with 74% higher volumetric energy and superior full-cell cycling compared to graphite electrodes.
The best results overall are obtained with 0.5%wt SWCNT added to the active powder, which produced 800mAh/g after 250 cycles.
