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yanbeilei_2金虫 (正式写手)
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现在，越来越多的汽车尾气排放，给环境造成严重的污染，特别是空气中PM2.5含量的升高，给人们的健康造成极大的困扰，因此，新能源汽车势必是未来的发展趋势。锂离子电池是新能源汽车电源的首选电池类型，因此，锂离子电极材料的研究，也势必成为研究人员的热点关注领域。现在，商业化负极材料是石墨材料，由于它的本质不安全性，使研究人员在不断寻找它的替代品，其中尖晶石型Li4Ti5O12材料，由于它的本质安全性能和和其它的优良性能spinel Li4Ti5O12(LTO) is promising in high-performance LIBs because of its extreme flat charge/discharge plateau with a high potential at 1.55V vs. Li/Li+, zero-strain feature toward lithium insertion/extraction, and environmental friendliness [11-14]. 然而，非常不幸的是由于Li4Ti5O12具有较低的电子和离子电导率，直接导致其在电动汽车和大规模储能方面的发展应用受到限制。人们想出了各种办法，去提高Li4Ti5O12电极材料的电化学性能：（1）减少电极材料的粒径尺寸，控制电极材料的微观形貌；（2）结构掺杂金属或者非金属原子；（3）表面涂覆导电层以减少界面电阻；只有第（3）种方法能够，能够建立界面阻挡层，抑制界面反应的发生，同时不会由于八面体（16d）和四面体（8a）的位置缺陷而减少可逆容量的损耗。因此，建立界面导电层是一种非常有效的改善LTO材料电化学性能的方法。最近，有研究证明Ti3+和TiN的表面修饰被认为是一种有效的增强电极材料性质的方法。Shen et. al 在钛片上生长 钛酸锂纳米线（LTO NWAs），再通过氢化方法生成Ti3+ sites 从而具有优良的电化学性质。Park et al.在NH3中处理对钛酸锂进行热处理，在表面生成TiN的导电膜，从而增强电极材料的电化学性质。因此，Ti3+ 修饰的混合中间相mixed-valent intermediate phase,和氮化钛的导电薄膜surface conductive layer of TiN 被认为是增强钛酸锂电化学性能的有效方法。 上述的表面修饰方法仍然存在缺点，主要在于制备过程复杂、使用昂贵的有机实际，仅仅适用于钛基板certain substrates不利用钛酸锂这种具有实际商业价值电极材料的应用推广。鉴于此，我们报道简单的一步固相焙烧方法，制备掺杂修饰和边缘修饰的方法，尤其值得注意的是，该制备方法没有任何复杂的前处理工艺。具有工艺简单、工艺成本低廉，具有良好的工业化前景。 |
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yanbeilei_2: 金币+100 2017-03-13 10:05:57
ANDPing: 金币+1, 感谢应助，可以报名参加此贴活动：http://muchong.com/bbs/viewthread.php?tid=11135508&fpage=1，获得额外奖励 2017-03-13 10:18:54
yanbeilei_2: 金币+100 2017-03-13 10:05:57
ANDPing: 金币+1, 感谢应助，可以报名参加此贴活动：http://muchong.com/bbs/viewthread.php?tid=11135508&fpage=1，获得额外奖励 2017-03-13 10:18:54
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LZ请查收，我不学电化学，某些专业词汇翻译不准确，你自己再改改。 In recent years, the issue of high level PM 2.5 has attracted enormous consideration among ordinary people as well as the government due to its potential threaten to human health. The pollution of automobile exhaust was regarded as one of the major source of PM 2.5, therefore, the exhaust-free automobile ran by new energy is believed to be the ideal substitute in the future and has been developed for years. The lithium battery is the top choice of power type for new energy automobile, thus the investigation of lithium, such as the electrolyte material, become the spotlight that focused by the science community. To date, the commercial negative electrolyte material is made by graphite, however, the low security nature of graphite urged the investigators to search a better replacement. Among the potential candidates, Li4Ti5O12 draw a lot of attention because of high level of security and other excellent performances, e.g. its extreme flat charge/discharge plateau with a high potential at 1.55V vs. Li/Li+, zero-strain feature toward lithium insertion/extraction, and environmental friendliness. Unfortunately, the low electron and ion conductivity of Li4Ti5O12 limits its commercial application in electricity driven car or large scale energy storage. To address this problem, various approaches were proposed to improve the electro-chemical performance of Li4Ti5O12, there are three possible ways, including: i) reduces the size of Li4Ti5O12 particle, controls its micro- Morphology; ii) introduces the dope of metal or non-metal atom; iii) coats the surface of Li4Ti5O12 with conductive layer to suppress interfacial resistance. Results showed that only third method is capable to construct an interfacial 阻挡层that suppresses the interfacial reaction as well as to avoid the loss of reversible capacity that cause by collapse of 16d or 8a. In one word, introduction of conductive layer is proved to be an effective resolution to improve the electro-chemical performance of LTO. Recent research demonstrated the surface modification by Ti3+ and TiN is a workable method to promote the ability of electrolyte material. Shen et. al 在钛片上生长 钛酸锂纳米线（LTO NWAs），再通过氢化方法生成Ti3+ sites 从而具有优良的电化学性质。Park et al.在NH3中处理对钛酸锂进行热处理，在表面生成TiN的导电膜，从而增强电极材料的电化学性质。因此，Ti3+ 修饰的混合中间相mixed-valent intermediate phase,和氮化钛的导电薄膜surface conductive layer of TiN 被认为是增强钛酸锂电化学性能的有效方法。However, not only the complicated fabrication and expensive organic reagent, but also the exclusive to Ti substrates, all limit the further application of 钛酸锂. To overcome this obstruct, we provide a simple one-step gutaihongshao method to implement the dope and blabla…, the most promising aspect is that our method is free of pre-treatment, easy to operate, cheap to scale-up, indicating its remarkable prospect in industry. |
2楼2017-03-09 21:57:57
3楼2017-10-16 18:14:28