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The energy density of soft-packed ion batteries can reach more than 300Wh/kg, which is very close to its limit energy density of 350Wh/kg, so the continuous space is still not large. In order to meet the needs of the next generation of high-performance batteries, people are starting to look at it. manila has turned to metallic silicone-based batteries with higher energy density. This medium-sized sulfur battery has attracted widespread attention with its ultra-high theoretical energy density of 2510Wh/kg. Especially after the technological breakthrough of the steel sulfur battery acquisition in 2009, the focus of the scientific and industrial world on the steel sulfur battery has been discovered in the branches that have rapidly increased. . But after nearly 10 years, we still haven’t seen the industrialization of Li-S batteries. So what’s the difficult way to industrialize the Sugar daddy‘s industrialization of the metal sulfur batteries?
(Source: WeChat public number “New PowerSugar daddyLeader” ID: newenergy-leader Author: Qinglang Pavilion)
Recently, Kunlei Zhu (first author) from Qufu Master Fan and Dr. Miao Lixiao (communication author) from Haike Group tagged: entertainment circle, strong female, female supporting actress, time travel, and Chao from MIT Wang (communication author) analyzed and summarized the problems existing in the industrialization of Li-S batteries.
The theoretical capacity of the S element can reach 1675mAh/g. According to the 2.15V uniform voltage calculation, the theoretical component energy density of the Li-S battery can reach 2510Wh/kg. However, S also has problems such as ablation of intermediate reactor products, poor electronic conductivity and large expansion, which has set its application in actual production. Although Li-S batteries have made great progress in academic research, there is still a big gap in Pinay escort to realize business applications.
In academic research, in order to clarify the problems of S-positive ablation and poor conductivity, students have decomposed a variety of carbon data, but most of the carbon data are difficult to achieve large-scale production, and there is still a lack of research on whether more industrial carbon data can be applied to Li-S batteries.
In addition, in academic research, whenever a buckle battery is used, many reports show that the buckle battery has a magnification of 10C. Pinay escortThe cycle life can exceed 1,000 times, and the effect of the cuolon exceeds 99%. However, the ratio of the Li-S battery in the packaged battery is difficult to exceed 0.2C, and the cycle life is difficult to exceed 300 times. The effect of the cuolon is often below 98%, because these functions are importantly determined by the amount of electrolyte, and the proportion of Li added to the overdose of Li. For example, the more LiNO3 is added to the electrolyte, the higher the effect of the cuolon, and the better the circulation function. However, when the amount of added is too much, the strong oxidation of nitric acid will cause serious safety problems.
In academics, people have adopted various methods to solve the problem of ablation of S in the main negative areas, such as in the overview of the electric shock, href=”https://philippines-sugar.net/”>EscortSeparator overview design coatings, etc., and add a layer of pull-out layer between the front and the partition. However, these methods also involve problems such as capital and practicality in actual applications, so they are difficult to apply in actual production.
The growth of Li dendrites is also a serious problem in Li-S batteries. Many academic reports have shown that this problem has been solved by metallic steel coating layers and electrolyte additives. However, in actual production, due to the unlimited amount of metallic Li in the battery, the consequences of these methods are unsatisfactory. This has led to the fact that soft-encapsulated stainless steel sulfur batteries still face low-curve efficacy and micro-short circuits. Problems such as href=”https://philippines-sugar.net/”>Escort and circulating life difference.
Sugar babyTo realize the commercial application of Li-S batteries, we must first solve the grand drought that exists between the above-mentioned academic research and commercial production.
1. Metal Steel Negative Electrode
The theoretical specific capacity of metal steel is 3860mAh/g, and the electric power is only -3.04V (vs standard humidity electrode), which is a fantasy negative information, but goldDuring the circulation process of the dielectric, there are problems such as dielectric dendrites growth and physical expansion, which will lead to the pulverization of the metal dielectric negative and the increase in the cell thickness. With the pulverization of metallic steel, the negative active steel will be destroyed. Under the infinite number of steellic steel, the capacity of the metal secondary battery will decline rapidly. At the same time, the pulverized metallic steel will be very active, and it will catch fire and burn in the air when exposed to air, resulting in safety risks.
In academic research, it is difficult to find the problem that metallic steel is negative. This important reason is that the metallic steel used in buckle batteries is thicker in thickness, so the excess ratio of the steel can reach several ten times. Therefore, even if the steel is sucked off during the circulation process, there is still an almost infinite steel to replace the original steel. However, in commercial applications, the reason why the battery’s energy is considered is that it cannot overload such a large amount of the battery.
In academic research, natural SEI films, modified electrolytes and 3D current collecting structures can be used to restrain the growth of Li dendrites. Although these methods have achieved excellent results, they are all realized at a lower surface density (<3mAh/cm2). However, in commercial soft-pack batteries, the surface density can usually reach more than 10mAh/cm2. Therefore, the methods used in academic research often lose their effect in actual growth.
This is stable and I like him. There will be a grand overall change in the process of metallic charge and discharge, which will cause a grand damage to the SEI membrane formed on its general profile, and at the same time cause a change in the thickness of the battery. This problem can be achieved through 3D current collecting structures, such as porous conductive foams and carbon fibers with micropores, which are relatively fantastic current collecting structures, but these methods also require a step-by-step study of their consequences in soft-packed batteries.
2.六后
In the past decade, the important tasks of scientific research students have focused on developing high-function positive data for Li-S batteries, reshaping the electronic conductivity of S positive electrodes, and restraining the ablation of intermediate products. With the cross between the negative, the positive reaction dynamic learning characteristics of the positive reaction have been developed to this end, a large number of carbon data, such as carbon nanotubes, graphene, porous carbon, etc., but these carbon data can be mass-produced in the industry today, and the carbon data with lower cost is only carbon nanotubes and acetylene black.
In addition, S’s load is also a problem solved by the commercial application requirements of Li-S batteries. In order to achieve better results in the academic research, S often lacks 50% of the proportion of the positive, butIn order to achieve a specific energy of 400Wh/kg in the package battery design, the proportion of S in the positive electrode reaches 75-78%. It is still a very challenging task to fully realize the capacity of the S positive electrode under this proportion.
3. Separation
In the academic research, scientific research students can effectively restrain the passage of ablation of the electrochemical function of the ablation between the multi-efficiency separator and the S-positive electrode and the separator through the insertion layer between the multi-efficiency separator and the separator, thereby increasing the electrochemical function of the battery. The preparation methods of multi-performance recombination separator are usually two Escort manila: 1) Reform the components and structure of separator to continuously selectively control the crossing of galvanized sulfur compounds between the negative and the separator; 2) Add a sealing layer between the positive and the separator, prohibiting the crossing of galvanized sulfur compounds between the negative and the negative. For example, the research and discussion of the study shows that a layer of porous activated carbon fiber layer or poly(Sugar baby) is deposited in the separator general condition, which can well receive the galvanic sulfur compounds in the electrolyte, thereby reducing its electrochemical function of Li-S batteries. Although the modified separator technology has ac TC:
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