Effect and mechanism study on buffer layer in secondary Li metal battery

doi:10.12028/j.issn.2095-4239.2018.0037

Abstract

Abstract: Li metal has the highest specific capacity (3860 mA·h·g^-1), the lowest negative electrochemical potential (-3.040 V vs. the standard hydrogen electrode) and a low density (0.59 g cm^-3), so Li metal is one of the most promising candidates as an anode material for next-generation energy storage systems. But unfortunately, the battery has hardly been commercialized successfully so far because the safety problem and low cycle efficiency of Li metal battery during charge and discharge. Li ion battery has been developed becoming mature nowadays, but its capacity cannot satisfy the advance in new technology. Therefore, it is of great urgent to develop next generation battery, Li metal battery is a good choice. To solve the problem of Li metal battery in application, a buffer layer is proposed in this paper which is inserted between anode and separator. In this paper, carbon nanotube (CNT) and polyaniline-carbon nanotube (PANI-CNT) film were used as buffer layer and inserted into the battery. Rate test and cycle test were taken to compare the rate performance and cycle performance of battery with and without buffer layer. And scanning electron microscopy test was taken to observe the growth of Li dendrites. Experiment shows that buffer layer is useful to suppress the growth of Li dendrite, and it can improve the safety and cycle efficiency of Li metal battery.

Key words: Li metal battery, buffer layer, carbon nanotube, polyaniline

CLC Number:

TQ028.8

ZHANG Ding, MU Shujun, CHAN Chingchuen, ZHOU You. Effect and mechanism study on buffer layer in secondary Li metal battery[J]. Energy Storage Science and Technology, 2018, 7(4): 646-653.

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