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Researchers at the Center for Self-Assembly and Complexity at the Institute of Basic Sciences (IBS) and the Department of Advanced Materials Science and Chemistry at Pohang University in Korea have developed a new porous solid-state lithium-ion battery (LIB) that improves performance and avoids overheating risks of.
Lithium Precursor Simple Merged Porous Lithium CB is a safer, dry-solid lithium electrolyte with high lithium ion conductivity and fluidity.
Lithium-ion battery can effectively replace the traditional lead-acid batteries, lead-acid batteries have been used since the late 1850s. Lithium-ion batteries are well-respected in consumer electronics due to their light weight, high energy density and low charge loss. Lithium batteries with cobalt cathodes store four times the energy of lead-acid batteries and twice the nickel-based batteries.
Although lithium-ion batteries are considered commercial batteries with superior performance, there are still some limitations in their use. Existing manufacturing techniques have almost reached the theoretical energy density limit of lithium-ion batteries. As a result of overheating of the heat spill, that "burning the fire," constitute a major challenge lithium batteries.
Since 2002, lithium-ion batteries for consumer electronics have seen nearly 40 fires or explosions in the United States alone. These batteries, with different combinations of lithium anodes, remain an important part of modern consumer electronics products, no matter how bad thermal records they have had.
Korean researchers introduced a completely different approach. Kimoon Kim, Ph.D., of the Institute of Basic Sciences, said: "We have studied the highly anisotropic (orientation-dependent) proton conduction behavior of porous CB [6] as an electrolyte for fuel cells. The porous CB [6] It is likely to be safer than existing materials, where existing batteries make organic solid-based electrolytes using a simple immersion method. "
Existing lithium-ion battery technology uses laminated lithium with good performance. However, the need for lighter and more powerful technologies has prompted continued research into new electrolytes.
The newly developed battery consists of pumpkin-shaped molecules called cucurbit [6] uril (CB [6]), distributed in a honeycomb structure. The molecules make up a very thin one-dimensional channel with an average diameter of 7.5 Angstroms [about 0.76 Angstroms or 0.76x10lOm for a single lithium ion] and pass between them. In addition, the physical structure of porous CB [6] allows lithium ions to diffuse more freely than conventional lithium-ion cells without the need for separators in other cells.
The experimental results show that the porous CB solid electrolyte has good lithium ion conductivity. The team conducted a lithium ion transport number determination (tLi +) compared to the electrolyte of existing batteries, and found that this value ranged from 0.7 to 0.8, exceeding the existing electrolytes by 0.2-0.5.
In addition, they exposed new batteries to temperatures as high as 373K (99.85 ° C), exceeding the standard high temperature limit of 80 ° C for existing batteries. In the experiment, the battery was cycled through four cycles from 298K to 373K (24.85 ° C to 99.85 ° C). As a result, there was no thermal spillage after any cycle, with little or no slight change in conductivity.
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