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首页> 外文期刊>Advanced energy materials >Microstructure-Controlled Ni-Rich Cathode Material by Microscale Compositional Partition for Next-Generation Electric Vehicles
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Microstructure-Controlled Ni-Rich Cathode Material by Microscale Compositional Partition for Next-Generation Electric Vehicles

机译：由微观的电动车辆微观组成隔板进行微观结构控制的Ni阴极材料

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摘要

A multicompositional particulate Li[Ni0.9Co0.05Mn0.05]O-2 cathode in which Li[Ni0.94Co0.038Mn0.022]O-2 at the particle center is encapsulated by a 1.5 mu m thick concentration gradient (CG) shell with the outermost surface composition Li[Ni0.841Co0.077Mn0.082]O-2 is synthesized using a differential coprecipitation process. The microscale compositional partitioning at the particle level combined with the radial texturing of the refined primary particles in the CG shell layer protracts the detrimental H2 - H3 phase transition, causing sharp changes in the unit cell dimensions. This protraction, confirmed by in situ X-ray diffraction and transmission electron microscopy, allows effective dissipation of the internal strain generated upon the H2 - H3 phase transition, markedly improving cycling performance and thermochemical stability as compared to those of the conventional single-composition Li[Ni0.9Co0.05Mn0.05]O-2 cathodes. The compositionally partitioned cathode delivers a discharge capacity of 229 mAh g(-1) and exhibits capacity retention of 88% after 1000 cycles in a pouch-type full cell (compared to 68% for the conventional cathode). Thus, the proposed cathode material provides an opportunity for the rational design and development of a wide range of multifunctional cathodes, especially for Ni-rich Li[NixCoyMn1-x-y]O-2 cathodes, by compositionally partitioning the cathode particles and thus optimizing the microstructural response to the internal strain produced in the deeply charged state.
机译：多容物颗粒Li [Ni0.9CO0.05Mn0.05] O-2阴极，其中颗粒中心的Li [Ni0.94CO0.038MN0.022] O-2通过1.5μm厚的浓度梯度（CG）壳包封利用差分共沉淀工艺合成最外表面组合物Li [Ni0.841CO0.077MN0.082] O-2。在颗粒水平的微观成分分配与CG壳层中精制初级颗粒的径向纹理突出，延伸了有害的H2 - > H3相变，导致单元电池尺寸的急剧变化。通过原位X射线衍射和透射电子显微镜证实的这种突起允许有效地耗散在H 2 - > H 3相转变上产生的内部应变，与传统单个组合物相比显着提高循环性能和热化学稳定性Li [Ni0.9Co0.05Mn0.05] O-2阴极。合成分区的阴极可提供229mAhg（-1）的放电容量，并且在袋式全细胞（相比，常规阴极的68％相比）在1000周期后表现出88％的容量保持。因此，所提出的阴极材料提供了合理的设计和开发各种多功能阴极的机会，特别是对于富含Ni的Li [NixCoymn1-XY] O-2阴极，通过组成阴极颗粒，从而优化微结构反应深度充电状态产生的内部应变。

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