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首页> 外文期刊>Electrochimica Acta >Improvement of high-rate performance of LiFePO4 cathode with through-holed LiFePO4/Activated carbon hybrid electrode structure fabricated with a pico-second pulsed laser
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Improvement of high-rate performance of LiFePO4 cathode with through-holed LiFePO4/Activated carbon hybrid electrode structure fabricated with a pico-second pulsed laser

机译：用微微第二脉冲激光器制造的通过孔LiFepo4 /活性炭混合电极结构改善LiFepo4阴极的高速性能

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In order to improve high-rate performance of lithium iron phosphate (LiFePO4, LFP) cathodes, the LFP and activated carbon (AC) layers were coated on one side and the other side, respectively, of an aluminum (Al) current collector (producing the LFP/AC cathode), and then through-holes with the average diameter of 22.8 mm and opening rate (R opening) of 0.64% were formed in the LFP/AC cathode (producing the through-holed LFP/AC cathode). The cell fabricated with one through-holed LFP/AC cathode and two lithium (Li) metal anodes exhibited a significantly improved high-rate performance in the C-rate region of 50-100 degrees C. The through-holed LFP/AC cathode was found to be superior in high-rate performance to a through-holed LFP/LFP cathode, where the LFP layers were coated on the both sides of an Al current collector, and a LFP/AC cathode having no through-holes. From the results obtained, it was found that, in a high-rate discharging process, AC layer is at first discharged because of its higher high-rate performance than the LFP layer and then energy (electrons) is (are) transferred by the difference in the electrode potential between the AC and LFP layers from the charged LFP layer to the discharged AC layer with the transfer of Li thorn ions via through-holes from the AC layer to the LFP layer (i. e., the AC layer is charged again) and a series of such processes are repeated. Forming through-holes in the LFP/AC cathode results in an improvement in its charging/discharging capacity and high-rate performance. (c) 2018 Elsevier Ltd. All rights reserved.
机译：为了提高磷酸铁锂（LiFePO4，LFP）阴极的高速率性能，将LFP和活性炭（AC）层分别在一侧和另一侧涂覆铝（Al）集电器（生产）然后在LFP / AC阴极中形成LFP / AC阴极的平均直径为22.8mm和开度（R开口）的通孔（产生通过孔的LFP / AC阴极）。用一个通孔的LFP / AC阴极和两个锂（Li）金属阳极制造的电池在50-100℃的C速率区域中表现出显着提高的高速率性能。通过孔的LFP / AC阴极是发现在通过孔的LFP / LFP阴极上的高速率性能优异，其中LFP层涂覆在Al集电器的两侧，以及没有通孔的LFP / AC阴极。从获得的结果，发现，在高速率放电过程中，AC层首先被排出，因为其比LFP层更高的高速性能，然后通过差异转移能量（电子）在从带电的LFP层之间的电极电位与来自带电的LFP层到排出的AC层，通过从AC层到LFP层的通孔转移Li刺离子（即，再次充电）和重复一系列这些过程。在LFP / AC阴极中形成孔导致其充电/放电容量和高速性能的改善。 （c）2018年elestvier有限公司保留所有权利。

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