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Current collectors (CCs) are an important and indispensable constituent of lithium-ion batteries (LIBs) and other batteries. CCs serve a vital bridge function in supporting active materials such as cathode and anode materials, binders, and conductive additives, as well as electrochemically connecting the overall structure of anodes and cathodes with an external circuit. Recently, various factors of CCs such as the thickness, hardness, compositions, coating layers, and structures have been modified to improve aspects of battery performance such as the charge/discharge cyclability, energy density, and the rate performance of a cell. In this paper, the details of interesting and useful attempts of preparing CCs for high battery performance in lithium-ion and post-lithium-ion batteries are reviewed. The advantages and disadvantages of these attempts are discussed.

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The adsorption behavior of 2,5-dimercapto-1,3,4-thiadiazole (DMcT) and 2-mercapto-5-methyl-1,3,4-thiadiazole (McMT) on Au and Cu electrode surfaces was studied using a 5 MHz quartz crystal microbalance (QCM), cyclic voltammetry, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and phase measurement interferometric microscopy (PMIM). Different behaviors were observed for the adsorption of DMcT and McMT on Au and Cu electrodes. Exposing the Au electrode to a McMT solution resulted in the formation of a stable, self-assembled monolayer on the electrode surface. A sharp peak resulting from the reductive desorption (RD) of McMT was observed for McMT chemisorbed on the Au electrode. It was also found that dimer-DMcT (di-DMcT) should be used in order to construct a stable DMcT layer on an Au electrode. Detailed comparisons of charge consumption and mass change during reductive desorption suggest that chemisorbed di-DMcT is monomeric and desorbs completely from the Au electrode in the RD process. However, on a Cu electrode surface, a stable McMT layer could not be constructed. It was also confirmed from PMIM experiments and Raman spectroscopy that DMcT etched copper electrodes, along with concurrent formation of a dimer form of DMcT (di-DMcT). The apparent reason for the different adsorption behaviors between DMcT and McMT is that DMcT is a stronger proton donor and oxidant.

In our previous paper (J. Power Sources, 183, 344 (2008) . The aim of the present work is to reduce the duration of this pre-cycling process. The cycling performance dependence of Li 1−α [Ni 0.18 Li 0.20+α Co 0.03 Mn 0.58 ]O 2 on the pre-cycling processing parameters, such as the number of cycles, voltage limits, and current density was explored. The processing conditions were then optimized, which ultimately reduced the pre-cycling treatment time from one week to 6.5 h.