Electrochemical characteristics of silver- and nickel-coated synthetic graphite prepared by a gas suspension spray coating method for the anode of lithium secondary batteries
Electrochemical characteristics of silver- and nickel-coated synthetic graphite prepared by a gas suspension spray coating method for the anode of lithium secondary batteries
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DOI：
10.1016/j.electacta.2003.12.070
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发表时间：
2004-11
影响因子：
6.6
通讯作者：
W. Choi;D. Byun;Joong-Kee Lee;B. Cho
中科院分区：
文献类型：
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作者：
W. Choi;D. Byun;Joong-Kee Lee;B. Cho
采用气相悬浮喷涂法制备了4种锂二次电池负极用镀银、镀镍的合成石墨。镀银电极由于加入了银锂合金而表现出较高的充放电容量，但在较高的充放电倍率下，倍率性能有所下降。这一结果可以解释为形成了具有较高阻抗的人造银氧化膜，这降低了由于其低电导率而在高充放电倍率下的倍率性能。然而，通过在合成石墨表面涂覆镍和银，提高了倍率性能。氧化反应不活跃的镍作为导电剂起到了重要的作用，提高了电极的导电性。
Four kinds of synthetic graphite coated with silver and nickel for the anodes of lithium secondary batteries were prepared by a gas suspension spray coating method. The electrode coated with silver showed higher charge–discharge capacities due to a Ag–Li alloy, but rate capability decreased at higher charge–discharge rate. This result can be explained by the formation of an artificial Ag oxidation film with higher impedance, this lowered the rate capability at high charge–discharge rate due to its low electrical conductivity. Rate capability is improved, however, by coating nickel and silver together on the surface of synthetic graphite. The nickel which is inactive with oxidation reaction plays an important role as a conducting agent which enhanced the conductivity of the electrode.