Huawei announced a major breakthrough in its research into Li-ion batteries, unveiling the world’s first long-lifespan graphene-assisted Li-ion battery able to withstand high temperatures. The announcement was made by Watt Laboratory, an organization under Huawei’s Central Research Institute, at the 57th Battery Symposium held in Japan.
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."
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.
華為宣布了其在鋰離子電池研究方面的一個重大突破——透露全球首個能夠耐高溫長壽命的石墨烯鋰離子電池。華為中央研究院瓦特實驗室於在日本舉行的第57屆電池討論會上宣布了這一消息。
華為的研究成果顯示，新款石墨烯耐高溫技術能夠使鋰離子電池在60℃的環境下正常運作，這比當前的上限要高出10℃。石墨烯鋰離子電池的壽命還將是普通鋰電池的兩倍。
瓦特實驗室首席科學家李陽興博士指出，石墨烯高溫鋰離子電池的突破來自三個方面：在電解液中加入特殊添加劑，除去痕量水，避免電解液的高溫分解；電池正極選用改性的大單晶三元材料，提高材料的熱穩定性；同時，採用新型材料石墨烯，可實現鋰離子電池與環境間的高效散熱。
「高溫環境下的充放電測試表明，同等工作參數下，該石墨烯基高溫鋰離子電池的溫升比普通鋰離子電池降低5℃；60°C高溫循環2000次，容量保持率仍超過70%；60℃高溫存儲200天，容量損失小於13%。」 李陽興博士表示。
而在2015年，華為瓦特實驗室在第56屆日本電池大會上就秀出了5分鐘即可充滿3000mAh電池48%電量的快充技術成果，引起業界廣泛關注。據李陽興博士透露，華為快充電池已經商用，並將於今年12月底正式對外發布超級快充手機。