Porous graphene composites enhance electrode performance
Recent studies have shown that nano-electrode materials are expected to provide energy or power density equivalent to several times that of current commercial lithium-ion batteries, but this material could only achieve its excellent performance in extremely low-load ultra-thin research electrodes. Commercial devices that require higher loads achieve their potential. A team of Professor Feng Feng of the University of California, Los Angeles has recently developed a three-dimensional porous graphene composite electrode material that successfully solves the key problem of electrode performance with a drastic decrease in the load, making it possible to prepare high-loaded high-performance electrodes. Relevant research results Published on the 11th in the United States, "Science" magazine.
Dian Weifeng recently received an interview with a reporter from Science and Technology Daily, said that although many nanomaterials exhibit excellent energy storage performance in some research devices, in these devices, the load of electrode active materials is often only the load commonly used in commercial devices. About 10% of the volume. Due to the extremely low load, the capacity or power density ultimately found in the overall device can hardly exceed the current lithium-ion battery significantly. If the electrode thickness is simply increased, as the thickness increases, both the electron transport resistance and the ion diffusion resistance will increase significantly, resulting in a sharp drop in the electrode performance.
In the three-dimensional porous graphene composites developed by the team, the highly connected graphene network structure provides excellent electron transport characteristics, while its multi-layered pore structure greatly facilitates the rapid transport of ions, thus making the material at high loads. For the first time in the electrode, high capacity and extremely high power characteristics are achieved at the same time. "This marks a crucial step in the development of high-performance electrode materials in the direction of commercial energy storage devices," said Cheng Huiming, a member of the Chinese Academy of Sciences and a researcher at the Institute of Metal Research at the Chinese Academy of Sciences.
Duan Fengfeng said that this solution can be applied to other high-performance electrode materials, providing a practical approach to realize the potential of such high-performance energy storage materials in commercial-grade devices, and is expected to greatly increase the related energy storage devices. Capacity and charge and discharge speeds. (Reporter Jiang Jing)
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