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Morphological control method of metal oxide/carbon negative electrode material for lithium ion battery

A technology for lithium-ion batteries and carbon anode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of regulating MOF precursors, etc., and achieve the effects of convenient operation, simple process, and high specific surface area

Active Publication Date: 2017-05-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reports in these literatures are limited to a simple calcination process for known MOF precursor materials
As far as we know, there is no report on controlling the morphology of MOF precursors by controlling the MOF assembly process, and then obtaining metal oxides and carbon materials with different morphologies.

Method used

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  • Morphological control method of metal oxide/carbon negative electrode material for lithium ion battery
  • Morphological control method of metal oxide/carbon negative electrode material for lithium ion battery
  • Morphological control method of metal oxide/carbon negative electrode material for lithium ion battery

Examples

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Embodiment 1

[0031] Example 1: Weigh 1.354g of manganese acetate and 2.75g of terephthalic acid, dissolve them in 50ml of dimethylformamide (in DMF), transfer them into a 100ml hydrothermal reactor, and heat and stir at 180°C for 10h. The reacted product was centrifuged, washed twice with absolute ethanol and deionized water, dried in an oven, and ground to obtain a white MOF precursor, which was designated as MOF-Mn(PTA)B 0 . The above white precursor was placed in a tube furnace filled with Ar gas flow, calcined at 600 °C for 2 h, and then naturally cooled to room temperature to obtain MnO-B 0 / C material. figure 1 a Recorded precursor MOF-Mn(PTA)B 0 SEM image, you can see MOF-Mn(PTA)B 0 It is a parallelepiped shape with a size of about 5 μm. figure 2 MnO-B 0 / C's XRD pattern, it can be seen from the figure that the material phase is mainly MnO, and contains a small amount of Mn 3 o 4 Miscellaneous. Table 1 records its BET specific surface area test results, it can be seen that ...

Embodiment 2

[0034] Weigh 1.354g of manganese acetate and 0.674g of benzoic acid and dissolve them in 50ml of DMF. After stirring overnight, add 2.018g of terephthalic acid, transfer to a 100ml hydrothermal reactor, and heat and stir at 180°C for 10h. The reacted product was centrifuged, washed twice with absolute ethanol and deionized water, dried in an oven, and ground to obtain a white MOF precursor, which was designated as MOF-Mn(PTA)B 1 . The above white precursor was placed in a tube furnace, calcined at 600 °C for 2 h in an argon atmosphere, and then cooled naturally to room temperature to obtain MnO-B 1 / C. Precursor MOF-Mn(PTA)B 1 SEM such as figure 1 As shown in b, it can be seen that MOF-Mn(PTA)B 1 It is in the shape of a microsheet, with a length of 3 μm and a width of 0.8 μm. figure 2 MnO-B 1 / C's XRD pattern, it can be seen from the figure that the material phase is mainly MnO, and contains a small amount of Mn 3 o 4 Miscellaneous. See Example 1 for battery assembly...

Embodiment 3

[0036] Weigh 1.354g of manganese acetate and 1.348g of benzoic acid and dissolve in 50ml of DMF. After stirring overnight, add 1.834g of terephthalic acid, transfer to a 100ml hydrothermal reactor, and heat and stir at 180°C for 10h. The reacted product was centrifuged, washed twice with absolute ethanol and deionized water, dried and ground to obtain a white MOF precursor, which was designated as MOF-Mn(PTA)B 2 . The obtained white precursor was placed in a tube furnace filled with Ar gas, calcined at 600 °C for 2 h, and then naturally cooled to room temperature to obtain a MnO / C material which was designated as MnO-B 2 / C. figure 1 c records the precursor MOF-Mn(PTA)B 2 SEM image, you can see MOF-Mn(PTA)B 2 It is in the form of microsheets, with a length of about 3 μm and a width of about 0.9 μm, but the thickness is significantly smaller than that of MOF-Mn(PTA)B 1 . figure 2 MnO-B 2 / C XRD pattern, it can be seen that the material phase is mainly MnO, and contains a...

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Abstract

The invention discloses a morphological control method of a metal oxide / carbon (MOx / C) composite material for the negative electrode of a lithium ion battery. The method comprises the following steps: adding metal ions and monodentate ligands with different proportions into a solvent, stirring for a period of time, then adding a multidentate ligand, and heating in a reaction kettle for a period of time to obtain the metal organic framework (MOF) precursor materials with different morphologies; and calcining the precursors in an inert gas atmosphere for a period of time to obtain the MOx / C composite materials with different morphologies. The composite materials disclosed by the invention have relatively high specific surface areas and rich pore structures, and have excellent rate performance and cycling stability as the negative electrode materials of the lithium ion battery. The morphological control method disclosed by the invention is simple to operate, easy to realize large-scale application, and can also be extended to other fields that focus on material morphology control.

Description

technical field [0001] The invention belongs to the technical field of high-energy battery materials, in particular to MO for lithium-ion batteries. x A control method for the morphology of / C composite anode materials. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices due to their high energy density and long cycle life, and have good application prospects in the fields of energy storage and power batteries. However, in order to further increase the energy density of lithium-ion batteries, we need to develop new high-capacity anode materials to replace the existing commercial graphite anode (its theoretical capacity is only 372mAh g -1 ). Metal oxide anode materials based on conversion mechanism have the advantages of high specific capacity and low price, which are expected to meet the requirements of next-generation lithium-ion battery anode materials. [0003] At present, metal oxides as anode materials for lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525
CPCH01M4/362H01M4/50H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王海燕孙旦唐有根张睿
Owner CENT SOUTH UNIV
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