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首页> 外文会议>NATO Advanced Study Institute on New Trends in Intercalation Compounds for Energy Storage, Sep 22-Oct 2, 2001, Sozopol, Bulgaria >APPLICATION OF THE CURRENT INTERRUPTION METHOD FOR THE MEASUREMENT OF THE OHMIC RESISTIVITY OF LiNi_(1-y)Co_yO_2 CATHODES AS A FUNCTION OF THE STATE OF DISCHARGE
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APPLICATION OF THE CURRENT INTERRUPTION METHOD FOR THE MEASUREMENT OF THE OHMIC RESISTIVITY OF LiNi_(1-y)Co_yO_2 CATHODES AS A FUNCTION OF THE STATE OF DISCHARGE

机译：电流中断法在测量LiNi_（1-y）Co_yO_2阴极的欧姆电阻率中的应用。

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摘要

A method is developed for the in-situ dynamic measurements of the area―specific resistivity of LiNi_(1-y)Co_yO_2 cathodes R_c as a function of the state of discharge x in cells with Li/Li~+ reference electrodes. The voltage rise transients, obtained by short pulse interruptions of the discharge current are free of polarisation components due to charge transfer and diffusion processes. The steep rise of R_c at x≥0.75 is in accord with the expression relating the cathode redox potential E_x with the state of discharge x proposed by Armand and developed by Ohzuku, which, in addition to Nernst logarithmic term contains a linear term kx, accounting for the short-range in-layer Li~+-Li~+ interaction forces. The values of the parameters derived from the R_c/x plots obtained in the first several cycles are reliable early indications for eventual degradation of the cathode and can serve as a basis for its optimisation.
机译：开发了一种用于原位动态测量LiNi_（1-y）Co_yO_2阴极R_c的面积比电阻率的方法，该方法是Li / Li〜+参比电极中电池放电状态x的函数。由于电荷转移和扩散过程，通过短暂中断放电电流而获得的电压上升瞬变没有极化分量。 R_c在x≥0.75处的陡峭上升与将阴极氧化还原电势E_x与Armand提出并由Ohzuku开发的放电状态x相联系的表达式，除Nernst对数项外还包含线性项kx，短程层内Li〜+ -Li〜+相互作用力从在前几个循环中获得的R_c / x图得出的参数值是阴极最终退化的可靠早期指示，可以用作优化阴极的基础。

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