Huawei Achieves Major Breakthrough in Graphene-Assisted High Temperature Li-ion Batteries
Huawei's research results show that new graphene-based heat-resistant technologies allow Li-ion batteries to remain functional in a 60°C environment, a temperature 10°C higher than the existing upper limit. The lifespan of the graphene-assisted Li-ion batteries will also be twice as long as ordinary Li-ion batteries.
Dr. Yangxing Li, Chief Scientist at Watt Laboratory, pointed out that three technologies contributed to the breakthrough in the graphene-assisted high-temperature Li-ion battery. First, a special additive in the electrolytes can remove trace water and prevent the electrolytes from evaporating in high temperatures. Second, modified large-crystal NMC materials are used for the cathode, improving the thermal stability of the cathode powder. Third, graphene allows for more efficient cooling of the Li-ion battery.
Dr. Li said, "We have performed charging and discharging tests in a high-temperature environment. The tests show that when working parameters are the same, the graphene-assisted high-temperature Li-ion battery is 5°C cooler than ordinary Li-ion batteries. Over 70% of the graphene battery's capacity is left after it is recharged 2,000 times at a temperature of 60°C. Less than 13% of its capacity is lost after being kept in a 60°C environment for 200 days."
Huawei's research results will reshape the storage systems of communications base stations. In high-temperature regions, outdoor base stations powered by the graphene-assisted high-temperature Li-ion batteries can have working lifespans longer than four years. These batteries ensure a high mileage for electric vehicles per charge in high temperatures. They can also guarantee the safe operation of drones, which often generate a significant amount of heat.
At the 56th Battery Symposium also held in Japan in 2015, Huawei's Watt Laboratory revealed its quick charging technology, which recharges 48% of a 3000mAh battery in just 5 minutes. This technology turned many heads. According to Dr. Li, Huawei has commercialized the developed quick charging batteries and will announce a super-quick charging mobile phone in late December.
The URL of Huawei's graphene-assisted high-temperature Li-ion battery demo video: https://youtu.be/OceA8Wye71M
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