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Preparation method of lithium manganese phosphate-graphene composite material, lithium manganese phosphate-graphene composite material and application

A technology of lithium manganese phosphate and composite materials, applied in nanotechnology, positive electrode, active material electrode and other directions for materials and surface science, can solve the problems of low electronic conductivity, ion mobility limitation, etc., to improve the conductivity , the effect of improving the mobility of Li+ ions

Active Publication Date: 2022-05-20
GRIMAT ENG INST CO LTD +2
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  • Claims
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Problems solved by technology

However, the extremely low electronic conductivity of lithium manganese phosphate and Li + Ion mobility also largely limits practical applications

Method used

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  • Preparation method of lithium manganese phosphate-graphene composite material, lithium manganese phosphate-graphene composite material and application
  • Preparation method of lithium manganese phosphate-graphene composite material, lithium manganese phosphate-graphene composite material and application

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preparation example Construction

[0031] According to the first aspect of the present invention, the present invention provides a kind of preparation method of lithium manganese phosphate-graphene composite material, comprises the steps:

[0032] First, graphene oxide is used as a growth template, and nano-lithium manganese phosphate crystals are grown in situ on graphene oxide; then, graphene oxide is reduced to graphene, and graphene is coated on the surface of nano-lithium manganese phosphate crystals in situ, to obtain Lithium manganese phosphate-graphene composites.

[0033] In the present invention, the lithium manganese phosphate-graphene composite material is obtained by in-situ growth and in-situ coating. Compared with the synthesis of lithium manganese phosphate by the solid-state method, crystals are obtained from the bottom-up reaction of the ion size, and nano-sized manganese phosphate can be obtained. lithium. Compared with the conventional solvothermal synthesis of lithium manganese phosphate, ...

Embodiment 1

[0067] The present embodiment provides a kind of lithium manganese phosphate-graphene composite material, and its preparation method comprises the steps:

[0068] (1) Lithium source, manganese source, phosphate source are weighed according to the ratio of 3:1:1 according to the mol ratio of lithium ion, manganese ion and phosphate ion;

[0069] (2) Lithium source and phosphate source are dissolved in glycerol respectively to obtain lithium solution I and phosphate solution II;

[0070] (3) graphene oxide is dispersed in water, after ultrasonic treatment, obtain graphene oxide solution;

[0071] (4) dissolving the manganese source and an appropriate amount of ascorbic acid in the graphene oxide solution in step (3), stirring for 4-12h to obtain a mixed solution III of the manganese source and graphene oxide;

[0072] (5) Add the solution III obtained in step (4) into the reaction kettle, and add the phosphate solution II dropwise at a rate of 100-200mL / min. After the dropwise ...

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Abstract

The invention provides a preparation method of a lithium manganese phosphate-graphene composite material, a lithium manganese phosphate-graphene composite material and its application, and relates to the technical field of battery materials. The preparation method comprises the following steps: first, graphene oxide is used as a growth Template, in-situ growth of nano-lithium manganese phosphate crystals on graphene oxide; then graphene oxide is reduced to graphene, and the graphene is in-situ coated on the surface of nano-lithium manganese phosphate crystals to obtain lithium manganese phosphate-graphene composite Material. The preparation method of lithium manganese phosphate-graphene composite material provided by the present invention utilizes the coordination effect of negatively charged functional groups on graphene oxide and the steric effect of its own large surface on the one hand to realize in-situ growth and improve the lithium manganese phosphate Li + On the other hand, through the in-situ coating of graphene, the graphene layer is tightly combined with lithium manganese phosphate crystals and uniformly and completely covered, which can effectively improve the conductivity of the nano-lithium manganese phosphate-graphene composite material.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a preparation method of a lithium manganese phosphate-graphene composite material, a lithium manganese phosphate-graphene composite material and applications thereof. Background technique [0002] Cathode materials are still the main technical bottleneck that determines the energy density of power lithium-ion batteries. In the positive electrode materials used in lithium-ion batteries, in the olivine structure phosphate source material system, all oxygen ions are bonded to P through strong covalent bonds. 5+ constitute a stable (PO 4 ) 3- Polyanionic groups, so the oxygen in the lattice is not easy to lose, which makes the material very safe and suitable for use as power batteries in the field of new energy vehicles and energy storage, but LiFePO 4 The voltage platform of the material is low (3.4V), and its energy density is limited. [0003] Lithium manganese phosp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/5825H01M4/625H01M10/0525B82Y30/00B82Y40/00H01M2004/028H01M2004/021Y02E60/10
Inventor 罗熳蒋文全夏信德薛建军尹鸿章郭亚茹
Owner GRIMAT ENG INST CO LTD
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