钒基杂多酸高温衍生复合材料的增强电化学储锂

doi:10.11896/cldb.25030092

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Abstract The inherently low specific capacity of graphite anodes(372 mAh/g) has constrained performance breakthroughs in lithium-ion batteries, creating an urgent need for next-generation electrode materials. While polyoxometalates (POMs) exhibit promising potential as electrode-active components due to their molecularly tailorable architectures and multi-electron redox characteristics, their practical implementation faces critical challenges including structural instability during cycling, dissolution-induced capacity fading, and sluggish ion diffusion kinetics. To address these limitations, this study presents a rationally designed thermal conversion protocol that transforms manganese-incorporated vanadomanganate POM precursors into Mn/V co-optimized heterostructured composites for enhanced electrochemical lithium storage. Systematic characterization reveals that calcination temperature exerts precise control over the phase evolution and morphological reconstruction of derived materials. When subjected to optimal thermal treatment at 450 ℃(heating rate 5 ℃·min^-1 under Ar atmosphere), the VM POM precursors underwent complete phase transformation into nanorod architectures consisting of monoclinic Na₅V₁₂O₃₂ (JCPDS No.45-0412) and triclinic Mn₂V₂O₇ (JCPDS No.49-0295), with homogeneous spatial distribution of V/Mn/O elements as evidenced by EDS elemental mapping. As a lithium-ion battery anode, cyclic voltammetry (CV) curves exhibited two reversible redox peak pairs at 1.02 V/0.57 V and 2.64 V/2.25 V (vs Li⁺/Li). The capacitive contribution reached 76.8% at 1.0 mV/s scan rate, with 40% capacity retention when current density increased from 0.1 A/g to 4.0 A/g. The composite delivered specific capacities of 790 mAh/g and 400 mAh/g at 0.1 A/g and 1.0 A/g after 100 and 1 000 cycles, respectively, with near-100% Coulombic efficiency and cycling retention rates approaching 100%.This thermal-derived composite demonstrates significantly enhanced lithium sto-rage performance compared to pristine POMs, highlighting the efficacy of the thermal conversion strategy in optimizing electrode materials.

Key words： polyoxometalate thermal conversion derived material negative electrode material electrochemical lithium storage

Received: 10 May 2026 Published: Online: 2026-05-18

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TB34

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	Articles by authors
	CHEN Bingsong
	JIANG Yanling
	MO Simei
	CAI Pingxiong
	LUO Xiangsheng
	CHAO Huixia

Cite this article:

CHEN Bingsong,JIANG Yanling,MO Simei, et al. Derivative Composite Materials from Vanadium-based Polyoxometalate Through High-temperature for Enhanced Electrochemical Lithium Storage[J]. Materials Reports, 2026, 40(9): 25030092-7.

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https://www.mater-rep.com/EN/10.11896/cldb.25030092 OR https://www.mater-rep.com/EN/Y2026/V40/I9/25030092

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