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What exactly is a graphene battery?

by:Vglory      2021-05-10
In short, graphene is composed of carbon atoms tightly combined into a hexagonal or honeycomb structure. The reason why graphene is so amazing is that the structure is only one atomic layer thick, which essentially makes graphene sheets two-dimensional. This 2D structure has very interesting properties, including excellent electrical and thermal conductivity, high flexibility, high strength and low weight. In terms of electrical and thermal conductivity, it is superior to copper (the metal element with the highest electrical conductivity). Supercapacitors can make the battery life longer and can be charged almost immediately. In terms of batteries, the function of graphene can be used in a variety of ways. The ideal use of graphene as a battery is as a supercapacitor. Supercapacitors can store the same current as traditional batteries, and can also be charged and discharged quickly. The movement speed of electrons in graphene can reach 1/300 of the speed of light, which is far higher than that in general conductors. In addition, graphene also has the characteristics of high conductivity and high specific surface area, which are its advantages. In 2016, Huawei reported that graphene was used in batteries, but Huawei’s graphene batteries added some graphene materials to lithium batteries; in 2017, Samsung announced the breakthrough of its graphene balls and increased charging speed. 5 times, the battery capacity has increased by 45%, but graphene batteries are not currently used on any Samsung mobile devices...The cost of graphene is too high, and the price of high-purity graphene is more than 1,000 yuan per gram. The unsolved problem is how to economically batch process graphene ultra-thin sheets for batteries and other technologies. Graphene vs. Lithium Ion is the same as a lithium battery. A graphene battery uses two conductive plates coated in a porous material and immersed in an electrolyte solution. However, although their internal composition is very similar, the two batteries have different characteristics. Graphene has higher conductivity than lithium batteries, and charging and discharging will become faster. For example, this is very useful for car batteries or fast charging between devices. High thermal conductivity also means that the battery runs at a lower temperature, even in a small size like a smartphone, which can extend battery life. Graphene batteries are also lighter and thinner than today's lithium batteries, which means smaller, thinner specifications and greater capacity without the need for additional space. Lithium ion can store up to 180Wh of energy per kilogram, while graphene can store up to 1000Wh per kilogram. In addition, graphene is safer. There is still a flaw in the internal design of the lithium battery. Overheating, overcharging and puncture will cause the chemical imbalance of the lithium battery to run out of control, resulting in spontaneous combustion or explosion. Graphene is more stable, flexible and strong. Lithium batteries can use graphene to improve the performance of the cathode conductor. The hybrid battery constructed in this way can reduce weight, shorten charging time, increase storage capacity and extend service life. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis of the difference between 18650 lithium battery and power lithium battery
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