14250 battery

The United States develops silicon oxycarbide glass graphene paper 14250 battery

Engineers at Kansas State University in the United States have developed a paper-like battery electrode that can help develop better space exploration or drone tools.

Gurpreet Singh, an associate professor of mechanical and nuclear engineering, and his research team used silicon oxycarbide glass and graphene to create 14250 battery.

This battery electrode has many characteristics: it is 10% lighter than other 14250 battery, with a cycle efficiency of nearly 100% and more than 1,000 charge and discharge cycles; the manufacturing material cost is low and made of silicon industry accessories; it can work normally at minus 15°C and can be widely used in special aerospace fields.

Singh's research team has been exploring new material combinations for battery electrode design and found that it is difficult to merge graphene and silicon into actual batteries. There are many technical challenges-such as small capacity per unit volume, low cycle efficiency and chemical-mechanical instability.

The team solved these technical challenges by making a self-supporting and sandwich-structured electrode consisting of a glass ceramic called silicon oxycarbide sandwiched between chemically or non-chemically modified graphene flakes.

The electrode has a high capacity of about 600 milliamp-hours per gram -- 400 milliamp-hours per cubic centimeter. The paper-like design is made of 20 percent chemically modified graphene sheets.

The paper-like design is different from current 14250 battery because it eliminates the metal foil support and polymer glue. The design can reduce the overall weight of the battery by 10 percent.

The lightweight electrode can store lithium ions and electrons with a cycle efficiency of nearly 100 percent for more than 1,000 charge and discharge cycles; most importantly, the material can achieve this level of performance in practical applications.

The paper-like electrode battery can reach a capacity of 200 milliamp-hours per gram when kept at -15 degrees Celsius for up to a month. Many batteries do not work properly at such low temperatures.

The silicon oxycarbide electrode is expected to be less expensive because the raw material - liquid resin - is a byproduct of the silicon industry.

Looking ahead, Singh and his team have practical challenges to tackle. Singh's goal is to produce larger-sized electrode materials. For example, current pencil lead batteries use graphite-coated copper foil electrodes that are more than a foot long. The team will also be conducting mechanical bending tests to see how they affect performance parameters.

Silicon oxycarbide can also be 3D printed, which will be another area of research.

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