Insight into the synthesis and tuning of uncoated, core–shell structured lithium nickel phosphate

Raafat, Leila; Thorimbert, Fanny; Diem, Achim M.; Fenk, Bernhard; Burghard, Zaklina

doi:10.1039/d1ta04153c

Cited by 4 publications

(6 citation statements)

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“…Each is resolved into two components, Ni 2+ (low BE) and Ni 3+ (high BE), and followed by its satellite peaks. The ratio between the deconvoluted subpeaks (Ni 3+ /Ni 2+ ) is 0.53, lower than that reported for the precursor powder of 0.63 . The platelet formation is thereby accompanied by the reduction of a fraction of Ni 3+ .…”

Section: Resultsmentioning

confidence: 56%

“…To support the conclusions drawn from the XPS analysis, the integration of lithium within the structure was quantified by means of chemical analysis, revealing the presence of lithium of about 1.5 wt % (Table S4). When compared with the precursor powder, the overall lithium and phosphorus contents decrease to less than one-third and to around half, respectively. This observation is linked to the dissolution of the lithium phosphates during the platelet formation, while incorporating the dissolved PO 4 3– and a fraction of the Li + within the structure.…”

Section: Resultsmentioning

confidence: 97%

“…The formation of the nanoplatelets is preliminarily studied by an SEM investigation, revealing the microstructural evolution at each step. The precursor powder, synthesized by a polyol-mediated method, 42 contains Ni-rich nanorods and lithium phosphates (Li 3 PO 4 , Li 4 P 2 O 7 ). Upon its dispersion in water by ultrasound, the phosphate crystals begin to dissolve, and the nanorods deagglomerate (Figure 1a).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The previously reported optimized polyol-mediated method was implemented. 42 In brief, a nickel acetate tetrahydrate solution (1.5 mol L −1 , Sigma Aldrich) was added to diethylene glycol (DEG, Sigma Aldrich) at 80 °C. Subsequently, the solution was heated to 140 °C for 1 h, followed by the dropwise addition of lithium dihydrogen phosphate solution (2.0 mol L −1 , Sigma Aldrich) at a rate of 1 mL min −1 .…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The previously reported optimized polyol-mediated method was implemented . In brief, a nickel acetate tetrahydrate solution (1.5 mol L –1 , Sigma Aldrich) was added to diethylene glycol (DEG, Sigma Aldrich) at 80 °C.…”

Section: Methodsmentioning

confidence: 99%

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Prelithiated, Multiscale Nickel Phosphate Octahydrate Platelets by a Tailored Nanoarchitectonics Approach

Raafat

Burghard

2023

Chem. Mater.

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Nickel phosphate octahydrate (Ni 3 (PO 4 ) 2 •8H 2 O) is a promising electrode material for next-generation energy storage devices. However, owing to the large initial irreversible capacity, its practical application is hindered. Prelithiation is a viable solution, nonetheless, usually associated with additional challenges in terms of safety, cost, and homogenous distribution of Li + . Herein, we report on a facile, cost-effective prelithiation method based on nanoarchitectonics for the synthesis of mesocrystalline Ni 3 (PO 4 ) 2 • 8H 2 O platelets. During their oriented self-assembly, the lithium phosphates present in the precursor act as the Li + source. A detailed, systematic investigation of the morphological evolution, from activation over nucleation to growth, revealed that the addition of a secondary phase with oxygen-containing functional groups accelerates the fabrication of complex multiscale hybrid materials. Accordingly, hybridization with graphene oxide (GO), cellulose nanofibers (CNF), and V 2 O 5 nanofibers (VNF) was demonstrated. The electrochemical assessment of the prelithiated multiscale material in the form of a free-standing aerogel revealed the benefits of the synergy of nanoarchitecture and prelithiation. Specifically, it decreases the effect of the initial capacity loss, facilitates ion intercalation, and introduces additional intercalation sites. Notably, dehydrated aerogels of the prelithiated nickel phosphate embedded in partially reduced GO deliver a significantly high capacity of 400 mAh g −1 when tested as the anode. The developed prelithiation strategy provides enlightenment for novel environmentally conscious synthesis routes for the commercial application of high-specific-capacity electrodes.

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Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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