British research and development of lithium battery technology innovation adds graphene beams to double battery life -Lithium - Ion Battery Equipment
Introduction: Researchers at the University of Warwick in the UK have discovered an effective way to replace graphite in anodes with silicon, increasing the capacity of lithium-ion batteries and doubling their lifespan, by strengthening the structure of the anode with graphene beams. above.
Researchers at Warwick Manufacturing Group have made significant progress in replacing lithium-ion battery anodes with silicone.
By adding graphene beams, the scientists managed to overcome the inherent performance issues of silicon, the second most abundant element in the Earth's crust and with 10 times the gravimetric energy density of graphite, thus increasing the battery's capacity and extending its lifespan. More than twice the lifespan.(Lithium - Ion Battery Equipment)
In a typical lithium-ion battery, the silicon's capacity decays. Since the volume of silicon particles expands during the lithiation process, the silicon particles will electrochemically agglomerate over time, hindering further charge and discharge efficiency.
Because silicon is inherently not elastic enough to handle the curing strains of repeated charging, this can lead to cracking, shattering, and rapid physical degradation of the anode composite microstructure.
However, researchers at the University of Warwick in the UK have discovered a new anode mixture that can be produced on an industrial scale without resorting to silicon's nanometer dimensions and its associated issues.
Isolating and manipulating several connected layers of graphene allowed researchers to obtain few-layer graphene (FLG) materials.
According to a study titled "Study on Phase-Dependent Impedance of Silicon-Few-layer Graphene Composite Electrode Systems" published in "Natural Scientific Reports", when FLG materials are used in anodes, the resistance of larger micron-sized silicon particles can be significantly improved. performance.
So the researchers created anodes made from a mix of 60% silicon particles, 16% FLG, 14% sodium/polyacrylic acid, and 10% carbon additives, then examined the performance (as well as the structure of the material) over 100 charge-discharge cycles. Variety).
Dr. Melanie Loveridge, a senior fellow at the university's WMG, noted that the FLG flakes improved the material's elastic and tensile properties, significantly reducing the physical expansion of lithium during the lithiation process. damage caused. "What's more, these FLG flakes are also very effective at maintaining separation between silicon particles," said the Warwick researchers. "Each battery charge cycle creates new opportunities for electrochemical welding to occur between silicon particles."
This added use of agglomeration gradually reduces and limits the electrolyte's access to all particles in the battery and prevents efficient diffusion of lithium ions, which of course reduces the battery's life and power output. The presence of FLG in the mixtures tested at WMG Warwick led the researchers to hypothesize that the phenomenon would be highly effective in mitigating electrochemical silicon fusion.
Further research teams have started working on this achievement as part of a two-year project led by Vartharon, together with Bridge University, CIC, Lithops and IIT (Italian Institute of Technology) for the pre-industrial production of silicon/graphene. Further work on the achievement project. Composite materials and process them into lithium-ion batteries for high-energy and high-power applications.
Researchers at Warwick Manufacturing Group have made significant progress in replacing lithium-ion battery anodes with silicone.
By adding graphene beams, the scientists managed to overcome the inherent performance issues of silicon, the second most abundant element in the Earth's crust and with 10 times the gravimetric energy density of graphite, thus increasing the battery's capacity and extending its lifespan. More than twice the lifespan.(Lithium - Ion Battery Equipment)
In a typical lithium-ion battery, the silicon's capacity decays. Since the volume of silicon particles expands during the lithiation process, the silicon particles will electrochemically agglomerate over time, hindering further charge and discharge efficiency.
Because silicon is inherently not elastic enough to handle the curing strains of repeated charging, this can lead to cracking, shattering, and rapid physical degradation of the anode composite microstructure.
However, researchers at the University of Warwick in the UK have discovered a new anode mixture that can be produced on an industrial scale without resorting to silicon's nanometer dimensions and its associated issues.
Isolating and manipulating several connected layers of graphene allowed researchers to obtain few-layer graphene (FLG) materials.
According to a study titled "Study on Phase-Dependent Impedance of Silicon-Few-layer Graphene Composite Electrode Systems" published in "Natural Scientific Reports", when FLG materials are used in anodes, the resistance of larger micron-sized silicon particles can be significantly improved. performance.
So the researchers created anodes made from a mix of 60% silicon particles, 16% FLG, 14% sodium/polyacrylic acid, and 10% carbon additives, then examined the performance (as well as the structure of the material) over 100 charge-discharge cycles. Variety).
Dr. Melanie Loveridge, a senior fellow at the university's WMG, noted that the FLG flakes improved the material's elastic and tensile properties, significantly reducing the physical expansion of lithium during the lithiation process. damage caused. "What's more, these FLG flakes are also very effective at maintaining separation between silicon particles," said the Warwick researchers. "Each battery charge cycle creates new opportunities for electrochemical welding to occur between silicon particles."
This added use of agglomeration gradually reduces and limits the electrolyte's access to all particles in the battery and prevents efficient diffusion of lithium ions, which of course reduces the battery's life and power output. The presence of FLG in the mixtures tested at WMG Warwick led the researchers to hypothesize that the phenomenon would be highly effective in mitigating electrochemical silicon fusion.
Further research teams have started working on this achievement as part of a two-year project led by Vartharon, together with Bridge University, CIC, Lithops and IIT (Italian Institute of Technology) for the pre-industrial production of silicon/graphene. Further work on the achievement project. Composite materials and process them into lithium-ion batteries for high-energy and high-power applications.
