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Synthesis method and application of lithium ion battery negative electrode active material Mn<x>Fe<1-x>C2O4

A technology of mnxfe1-xc2o4 and negative electrode active materials, which is applied in the field of synthesis of new energy materials, can solve the problems of low oxalate capacity, poor electrochemical performance, and poor cycle stability, and achieve simple synthesis methods, low charge and discharge platforms, and easy The effect of the operation

Inactive Publication Date: 2020-01-24
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the past research, the method of preparing oxalate was generally prepared by the reverse micellar method. The oxalate prepared by this method has low capacity and poor cycle stability.
Therefore, the manganese oxalate prepared by the reverse micelle method has poor electrochemical performance and is not suitable for lithium-ion battery materials.

Method used

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  • Synthesis method and application of lithium ion battery negative electrode active material Mn&lt;x&gt;Fe&lt;1-x&gt;C2O4
  • Synthesis method and application of lithium ion battery negative electrode active material Mn&lt;x&gt;Fe&lt;1-x&gt;C2O4
  • Synthesis method and application of lithium ion battery negative electrode active material Mn&lt;x&gt;Fe&lt;1-x&gt;C2O4

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Effect test

Embodiment 1

[0041] A kind of lithium ion battery negative electrode active material MnC of the present embodiment 2 o 4 The synthetic method of described method specifically comprises the following steps:

[0042] Sequentially weigh 2.45g of Mn(Ac) 2 4H 2 O, 1.26 g of H 2 C 2 o 4 2H 2 O was added to a 100mL beaker, and a total amount of 60mL of EG and water was added as a solvent (V EG :V H2O =3:1), placed on a magnetic stirrer and stirred for 30 minutes, so that all samples were evenly mixed together. The resulting mixture was transferred to a 100 ml polytetrafluoroethylene stainless steel reaction kettle, and then the reaction kettle was placed in an oven and heated to 180° C. for 24 h. After the reaction was completed, the reactor was cooled to room temperature, and the obtained samples were washed three times with deionized water and ethanol, then centrifuged, and then dried in a vacuum oven at 60°C for 12 hours. Finally, the dried sample was heated in a tube furnace under t...

Embodiment 2

[0045] A kind of lithium ion battery negative electrode active material Mn of the present embodiment 0.9 Fe 0.1 C 2 o 4 The synthetic method of described method specifically comprises the following steps:

[0046] Sequentially weigh 2.20g of Mn(Ac) 2 4H 2 O, 0.278 g FeSO 4 ·7H 2 O and 1.26g of H 2 C 2 o 4 2H 2 O was added to a 100mL beaker, and a total amount of 60mL of EG and water was added as a solvent (V EG :V H2O =3:1), placed on a magnetic stirrer and stirred for 30 minutes, so that all samples were evenly mixed together. The resulting mixture was transferred to a 100 ml polytetrafluoroethylene stainless steel reaction kettle, and then the reaction kettle was placed in an oven and heated to 180° C. for 24 h. After the reaction was completed, the reactor was cooled to room temperature, and the obtained samples were washed three times with deionized water and ethanol, then centrifuged, and then dried in a vacuum oven at 60°C for 12 hours. Finally, the dried s...

Embodiment 3

[0049] A kind of lithium ion battery negative electrode active material Mn of the present embodiment 0.85 Fe 0.15 C 2 o 4 The synthetic method of described method specifically comprises the following steps:

[0050] Sequentially weigh 2.08g of Mn(Ac) 2 4H 2 O, 0.417 g FeSO 4 ·7H 2 O and 1.26g of H 2 C 2 o 4 2H 2 O was added to a 100mL beaker, and a total amount of 60mL of EG and water was added as a solvent (V EG :V H2O =3:1), placed on a magnetic stirrer and stirred for 30 minutes, so that all samples were evenly mixed together. The resulting mixture was transferred to a 100 ml polytetrafluoroethylene stainless steel reaction kettle, and then the reaction kettle was placed in an oven and heated to 180° C. for 24 h. After the reaction was completed, the reactor was cooled to room temperature, and the obtained samples were washed three times with deionized water and ethanol, then centrifuged, and then dried in a vacuum oven at 60°C for 12 hours. Finally, the dried...

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Abstract

The invention discloses a lithium ion battery negative electrode active material Mn<x>Fe<1-x>C2O4 and a synthesis method and application thereof. Manganese oxalate with a rod-like structure is prepared by adopting a hydrothermal or solvothermal method. In addition, a proper proportion of ferrite is doped, and a series of manganese ferric oxalate Mn<x>Fe<1-x>C2O4 materials which are modified from manganese oxalate and have different morphologies are obtained by adopting the same method. Tests in the application of the Mn<x>Fe<1-x>C2O4 materials in lithium ion batteries show that the reversiblespecific capacity is obviously improved and the cyclic stability is also significantly improved when the Mn<x>Fe<1-x>C2O4 material synthesized in the invention is used as a negative electrode active material, compared with pure-phase manganese oxalate. For example, Mn0. 8Fe0.2C2O4 prepared through doping can remarkably improve the capacity of lithium ion batteries, and shows most excellent cycle performance and rate capability. Therefore, the Mn<x>Fe<1-x>C2O4 is a potential lithium ion negative electrode material.

Description

technical field [0001] The invention relates to the technical field of synthesis of new energy materials, in particular to a lithium-ion battery negative electrode active material Mn x Fe 1-x C 2 o 4 Synthetic methods and applications. Background technique [0002] Lithium-ion batteries (LIBs) have a wide range of applications in electric vehicles, hybrid vehicles, smart grids, renewable energy and other fields. Lithium-ion electrode materials have always been a research hotspot. [0003] Graphite, as an anode material for commercially used lithium-ion batteries, has low operating voltage and stable cycle capacity, but with the increasing demand for high-energy, high-power-density LIBs, the low capacity of graphite (theoretical capacity = 372mAh g -1 Corresponds to LiC 6 ) and poor performance kinetics of lithium intercalation and desorption have become factors restricting practical applications, making it difficult to meet the increasing demand for lithium-ion battery ...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/13H01M10/0525
CPCH01M4/60H01M4/13H01M10/0525H01M2004/027Y02E60/10
Inventor 王石泉贾艳梅刘建文陈文吴慧敏
Owner HUBEI UNIV
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