Adsorption energy engineering of nickel oxide hybrid nanosheets for high areal capacity flexible lithium-ion batteries
Adsorption energy engineering of nickel oxide hybrid nanosheets for high areal capacity flexible lithium-ion batteries
复制标题
高面积容量柔性锂离子电池氧化镍杂化纳米片的吸附能工程
DOI：
10.1016/j.ensm.2019.11.001
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发表时间：
2020-03-01
影响因子：
20.4
通讯作者：
Balogun (Jie Tang), M-Sadeeq
中科院分区：
文献类型：
--
作者：
Huang, Yongchao;Yang, Hao;Balogun (Jie Tang), M-Sadeeq
丰富具有明确功能的电极材料对实现高面积容量锂离子电池具有重要影响，但也极具挑战性。以过渡金属氧化物（TMOs）为例，已经有一些研究尝试证明了TMOs在锂存储性能上的巨大变化，但对其吸附能力的解释却很少报道。本研究通过工程修饰多孔掺n碳纤维和碳量子点（CDs）来调节p轨道能级的位置，成功地增强了NiO纳米片的锂离子存储化学性质。制备的单片NiO杂化纳米片（CF/ECF/NiO/CD）在0.25 mA cm（-2）时具有3.97 mA h cm（-2）的高可逆面积容量，在3.0 mA cm（-2）时具有2.91 mA h cm（-2）的优异循环稳定性，以及在6.0 mA cm（-2）时具有2.61 mA h cm（-2）的吸引速率容量。原位拉曼分析、XPS和DFT计算表明，性能增强与NiO、多孔碳纤维和CDs之间的电子调制有关，这种调制触发了pband向适应界面电子转移的转变，从而有助于促进Li的存储活性。此外，组装了基于CF/ECF/NiO/CD阳极的全柔性锂离子电池，实现了619.9 Wh L-1的体积能量密度（相当于201.7 Wh kg(-1)）。这项工作为高面积容量LIB开辟了一种可行的方法，并为设计其他LIB电极及其他电极提供了相关的理解。
Enriching electrode materials with definite functions is of great influence but highly challenging towards achieving high areal capacity lithium ion batteries (LIBs). Taking transition metal oxides (TMOs) as a case study, several attempts have been employed to demonstrate the large variations in lithium storage performance of TMOs, but explanation of the adsorption capability is rarely reported. Herein, the Li-ion storage chemistry of NiO nanosheets is successfully enhanced by modulating the position of the p-orbital energy level via engineering with porous N-doped carbon fiber and carbon quantum dots (CDs). The as-prepared monolithic NiO hybrid nanosheets (denoted CF/ECF/NiO/CD) exhibit high reversible areal capacity of 3.97 mA h cm(-2) at 0.25 mA cm(-2), excellent cyclic stability with capacity of 2.91 mA h cm(-2) at 3.0 mA cm(-2), as well as attractive rate capacity of 2.61 mA h cm(-2) at 6.0 mA cm(-2). In situ Raman analyses, XPS, and DFT calculations reveal that performance enhancement is related to the electronic modulations between NiO, porous carbon fiber and CDs that triggers the shift of the pband towards accommodating interfacial electron transfer that helps in promoting the Li storage activity. In addition, an all-flexible lithium ion battery based on CF/ECF/NiO/CD anode is assembled and a volumetric energy density of 619.9 Wh L-1 is achieved (equivalent to an energy density of 201.7 Wh kg(-1)). This work opens an achievable approach for high-areal-capacity LIBs and provides relevant understanding into designing other LIB electrodes and beyond.