Nickel sulfides as a cathode for all-solid-state ceramic lithium batteries
Nickel sulfides as a cathode for all-solid-state ceramic lithium batteries
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DOI：
10.1016/j.jpowsour.2007.06.168
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发表时间：
2007-12
影响因子：
9.2
通讯作者：
T. Matsumura;K. Nakano;R. Kanno;A. Hirano;N. Imanishi;Y. Takeda
中科院分区：
文献类型：
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作者：
T. Matsumura;K. Nakano;R. Kanno;A. Hirano;N. Imanishi;Y. Takeda
研究了硫化镍（Ni_3S_2）作为全固态锂电池正极材料的可行性，并以硫代锂离子电池（Li_2S-GeS_2-P_2S_5）为电解质。采用新的烧结制度，在可重复使用的石英管中，通入氩气，合成了Ni_3S_2和Li_2S-GeS_2-P_2S_5体系。在700 °C下用10%过量P2 S5制备的样品观察到最高的离子电导率2.39×10−3S cm− 1，并与硫代LISICON Li3.35Ge0.35P0.65S4的最大电导率进行比较。基于Ni 3S 2/Li3.35Ge0.35P0.65S4/Li-Al合金的全固态锂电池在30次循环后显示出大于10300 mAh g− 1的电化学容量。发现电池的循环性能取决于阴极混合物中的Ni 3S 2/硫代-LISICON组成，其中电池含有60重量%的Ni 3S 2/硫代-LISICON。Ni_3S_2的可逆容量最稳定。由于首次放电容量的深度也影响循环性能，在放电反应过程中消耗的Ni 3S 2可能在镍还原机理中起重要作用。
The nickel sulfide, Ni3S2, was examined as a potential cathode material of the all-solid-state-lithium-batteries using thio-LISICON, Li2S–GeS2–P2S5, as the solid-electrolyte. Ni3S2and Li2S–GeS2–P2S5system, was synthesized with a new sintering system, which proceed under a flowing argon in the reusable quartz tube. The highest ionic conductivity 2.39×10−3S cm−1was observed for a sample prepared at 700 °C with 10% of excess P2S5, and bear comparison with the maximum conductivity reported for the thio-LISICON, Li3.35Ge0.35P0.65S4. An all-solid-state-lithium-battery based on, Ni3S2/Li3.35Ge0.35P0.65S4/Li–Al alloy, showed electrochemical capacities of greater than ∼300 mAh g−1after 30 cycles. The cycling performances of the cells were found to be dependent on the Ni3S2/thio-LISICON compositions in the cathode mixture, with a cell containing 60 wt.% of Ni3S2exhibiting the most stable reversible capacities. As the depth of the first discharge capacity also influences the cycling properties, Ni3S2consumed during the discharge reaction may play an important role in the nickel reduction mechanism.