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首页> 外文期刊>International Journal of Electrochemical Science >Titanium-doped P2-type Na0.67Co0.67Mn0.33-χTiχO2 (0 ≤ χ ≤ 0.2) as Novel Cathodes for Sodium Ion Batteries with Superior-Rate
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Titanium-doped P2-type Na0.67Co0.67Mn0.33-χTiχO2 (0 ≤ χ ≤ 0.2) as Novel Cathodes for Sodium Ion Batteries with Superior-Rate

机译：钛掺杂的P2型Na 0.67 Co 0.67 Mn 0.33-χ Ti χ O 2 < / sub>（0≤χ≤0.2）作为具有超高速率的钠离子电池的新型阴极

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Sodium ion batteries (SIBs) have attracted increasing attention due to the naturally abundant and inexpensive sodium resources. The layered transition metal oxides are proposed for advanced cathode materials of SIBs. However, the phase transformation and rate performance of layered compounds are still a pivotal challenges. Here，we report a series of Ti-doped Na0.67Co0.67Mn0.33-χTiχO2 ( 0≤ χ ≤0.2 ) samples as cathodes for SIBs. As a result, the multiphase transition during the charge-discharge was successfully prohibited by partial Ti doped. It is found that the Na0.67Co0.67Mn0.23Ti0.1O2 cathode exhibited superior rate performance and tremendous capacity retention. Particularly, the -1 Na0.67Co0.67Mn0.23Ti0.1O2 cathode delivers a initial discharge capacity of about 91.2 mAh g at 1C. More attractively, even at high current rates (10, 15, 20 and 30 C), superior rate capability is achieved while retaining tremendous capacity retention. Nearly 81.02% of the initial capacity was retained after -1 1000 charge/discharge cycles at 20 C (3.42A g ). Therefore, Ti-doped Na0.67Co0.67Mn0.23Ti0.1O2 may be a promising cathode material for SIBs with excellent rate and cycling performance.
机译：钠离子电池（SIB）由于天然丰富且廉价的钠资源而引起了越来越多的关注。提出了用于SIB的高级阴极材料的层状过渡金属氧化物。然而，层状化合物的相变和速率性能仍然是关键的挑战。在此，我们报告了一系列Ti掺杂的Na0.67Co0.67Mn0.33-χTiχO2（0≤χ≤0.2）样品作为SIB的阴极。结果，通过部分掺杂Ti成功地禁止了在充电-放电期间的多相转变。发现Na0.67Co0.67Mn0.23Ti0.1O2阴极表现出优异的速率性能和巨大的容量保持率。尤其是，-1 Na0.67Co0.67Mn0.23Ti0.1O2阴极在1C时的初始放电容量约为91.2 mAh g。更有吸引力的是，即使在高电流速率（10、15、20和30 C）下，也可以实现出色的速率能力，同时保持巨大的容量保持率。在20°C（3.42A g）-1 1000次充电/放电循环后，保留了将近81.02％的初始容量。因此，Ti掺杂的Na0.67Co0.67Mn0.23Ti0.1O2可能是SIBs的有希望的阴极材料，具有优异的速率和循环性能。

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