Novel Composite Anodes Consisting of Lithium Transition-Metal Nitrides and Transition Metal Oxides for Rechargeable Li-Ion Batteries
Novel Composite Anodes Consisting of Lithium Transition-Metal Nitrides and Transition Metal Oxides for Rechargeable Li-Ion Batteries
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DOI：
10.1149/1.2149296
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发表时间：
2006-02
影响因子：
3.9
通讯作者：
Y. Liu;Y. Takeda;T. Matsumura;Jian Yang;N. Imanishi;A. Hirano;O. Yamamoto
中科院分区：
文献类型：
--
作者：
Y. Liu;Y. Takeda;T. Matsumura;Jian Yang;N. Imanishi;A. Hirano;O. Yamamoto
锂过渡金属氮化物是锂离子电池的理想负极材料。然而，锂必须在初始阳极氧化中从氮化物中提取，这表明这些化合物不能直接与电流阴极联合收割机结合以构成电池。通过在含有上述氮化物的电极中引入一定量的Co 3 O 4，可以克服这种阻碍，Co 3 O 4显示出大的容量和相对高的氧化/还原电位。这两种活性主体之间的化学自发反应导致锂金属氮化物的脱锂状态。在相对于Li/Li + Co 3 O 4的1.4-0 V的循环下，对锂相对惰性，并且氮化物变得电化学活性。复合电极显示出100%的高首次循环效率，500 mAh g - 1的大容量，和优异的循环性能。此外，研究表明，复合电极在高温下与聚环氧乙烷（PEO）电解质一起工作时表现出高循环稳定性。通过差示扫描量热法测量，发现在高锂利用率下与PEO电解质的复合电极的反应加热与锂金属和基于锂合金的系统相比是非常低的。这表明复合电极在容量、首次循环充电效率和热依赖性方面可能是全固态PEO锂离子电池的有希望的阳极候选者。
Lithium transition-metal nitrides are promising anode candidates for Li-ion batteries. However, lithium must be extracted from the nitrides in an initial anodic oxidation, indicating these compounds cannot directly combine with the current cathodes to constitute cells. This deterrent can be overcome by introducing a certain amount of Co 3 O 4 , which shows large capacities and relatively high oxidation/reduction potentials, into the electrodes containing the above nitrides. A thermodynamically spontaneous reaction between these two active hosts results in a delithiated state of lithium metal nitrides. Under cycling within 1.4-0 V vs Li/Li + Co 3 O 4 is relatively inert to lithium and the nitrides become electrochemically active. The composite electrodes show high first-cycle efficiency of 100%, large capacities of 500 mAh g - 1 , and excellent cyclability. Furthermore, research revealed that the composite electrodes demonstrated high cycling stability operating with polyethylene oxide (PEO) electrolytes at the elevated temperature. The reaction heating of the composite electrode under high Li utilization with PEO electrolytes via differential scanning calorimetry measurement was found to be extremely low compared with those of the lithium metal and the Li-alloy-based systems. suggesting that the composite electrodes could be promising anode candidates for all-solid-state PEO Li-ion batteries in terms of capacity, first-cycle charge efficiency, and thermal reliance.