Effects of Excessive Prelithiation on Full-Cell Performance of Li-Ion Batteries with a Hard-Carbon/Nanosized-Si Composite Anode
Effects of Excessive Prelithiation on Full-Cell Performance of Li-Ion Batteries with a Hard-Carbon/Nanosized-Si Composite Anode
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DOI：
10.3390/batteries8110210
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Y. Abe;Ippei Saito;Masahiro Tomioka;M. Kabir;S. Kumagai
中科院分区：
文献类型：
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作者：
Y. Abe;Ippei Saito;Masahiro Tomioka;M. Kabir;S. Kumagai
研究了过度预锂化对硬碳/纳米硅（HC/N-Si）复合阳极锂离子电池（LIB）全电池性能的影响;分析了HC和N-Si以质量比9：1和8：2简单混合的情况。组装CR2032型半电池和全电池以评估电化学LIB阳极行为。半电池配置的恒电流测量显示，具有8：2 HC/N-Si质量比的复合阳极在0.1 C下表现出高容量（531 mAh g-1），并且在0.1-10 C下表现出优异的上级电流-倍率依赖性（倍率性能）。为了评估实际的LIB阳极性能，在全电池中使用性能最佳的复合阳极。在全电池组装之前，通过电化学Li掺杂以不同的截止阳极比容量（200-600 mAh g-1）预锂化复合阳极。将复合阳极与LiNi0.5Co0.2Mn0.3O2阴极配对构建全电池，通过进行顺序速率和循环性能测试来评估其性能。硫化只影响循环性能，不影响速率性能。在截止阳极比容量大于或等于500 mAh g-1时进行预锂化的全电池中观察到优异的容量保持率。
The effects of excessive prelithiation on the full-cell performance of Li-ion batteries (LIBs) with a hard-carbon/nanosized-Si (HC/N-Si) composite anode were investigated; HC and N-Si simply mixed at mass ratios of 9:1 and 8:2 were analyzed. CR2032-type half- and full-cells were assembled to evaluate the electrochemical LIB anode behavior. The galvanostatic measurements of half-cell configurations revealed that the composite anode with an 8:2 HC/N-Si mass ratio exhibited a high capacity (531 mAh g−1) at 0.1 C and superior current-rate dependence (rate performance) at 0.1–10 C. To evaluate the practical LIB anode performance, the optimally performing composite anode was used in the full cell. Prior to full-cell assembly, the composite anodes were prelithiated via electrochemical Li doping at different cutoff anodic specific capacities (200–600 mAh g−1). The composite anode was paired with a LiNi0.5Co0.2Mn0.3O2 cathode to construct full-cells, the performance of which was evaluated by conducting sequential rate and cycling performance tests. Prelithiation affected only the cycling performance, without affecting the rate performance. Excellent capacity retention was observed in the full-cells with prelithiation conducted at cutoff anodic specific capacities greater than or equal to 500 mAh g−1.