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Manganese pyrophosphate, a negative electrode material for lithium-ion batteries with core-shell structure, and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problem of increasing the contact area between active materials and electrolyte, affecting the electrochemical performance of materials, and poor conductivity of manganese pyrophosphate. problems, to achieve the effect of improving electrochemical performance, unobstructed lithium ion deintercalation channel, and improving electrochemical performance

Active Publication Date: 2017-06-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the application of the synthesized manganese pyrophosphate to lithium-ion battery anode materials.
CN103539098A discloses a method for preparing manganese pyrophosphate nanosheets. When the manganese pyrophosphate nanosheets prepared according to the method are used in lithium-ion batteries, due to the disproportionation reaction of Mn in the electrolyte during charge and discharge, the disproportionation of Mn will occur. Dissolution leads to a decrease in the electrochemical performance of the material, and the nanosheet morphology greatly increases the contact area between the active material and the electrolyte due to its large specific surface area. Therefore, the nanosheet manganese pyrophosphate will promote the dissolution of Mn, and the manganese pyrophosphate Poor conductivity, which will affect the electrochemical performance of the material when used as an electrode material for lithium-ion batteries
[0004] CN104091953A discloses a vanadium pyrophosphate, a negative electrode material for lithium ion batteries, and its preparation method. A reducing agent must be used in the raw materials, and the final product has a nano-sheet shape without carbon coating, which makes its conductivity poor.

Method used

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  • Manganese pyrophosphate, a negative electrode material for lithium-ion batteries with core-shell structure, and preparation method thereof
  • Manganese pyrophosphate, a negative electrode material for lithium-ion batteries with core-shell structure, and preparation method thereof
  • Manganese pyrophosphate, a negative electrode material for lithium-ion batteries with core-shell structure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix 0.005mol disodium manganese edetate and 0.005mol ammonium dihydrogen phosphate, and dissolve them in 100mL deionized water to obtain a mixed solution;

[0027] (2) Adjust the pH value of the mixed solution obtained in step (1) to 3;

[0028] (3) Place the mixed solution after pH adjustment in step (2) in a constant temperature water bath at 60°C, and mechanically stir for 30 hours to form a uniform gel;

[0029] (4) Dry the gel obtained in step (3) in a vacuum drying oven at 60°C for 15 hours to obtain a manganese pyrophosphate precursor;

[0030] (5) Place the manganese pyrophosphate precursor obtained in step (4) in a tubular sintering furnace, sinter at 700°C for 12 hours in an argon atmosphere, and cool naturally to room temperature to obtain coke, a negative electrode material for lithium-ion batteries with a core-shell structure. manganese phosphate.

[0031] After testing, the obtained manganese pyrophosphate, the negative electrode material of the lith...

Embodiment 2

[0034] (1) Mix 0.008mol manganese acetylacetonate and 0.008mol diammonium hydrogen phosphate, and dissolve them in 100mL deionized water to obtain a mixed solution;

[0035] (2) Adjust the pH value of the mixed solution obtained in step (1) to 7;

[0036] (3) Place the mixed solution after adjusting the pH value in step (2) in a constant temperature water bath at 80°C, and mechanically stir for 15 hours to form a uniform gel;

[0037] (4) drying the gel obtained in step (3) in a vacuum oven at 100°C for 5 hours to obtain a manganese pyrophosphate precursor;

[0038] (5) Place the manganese pyrophosphate precursor obtained in step (4) in a tubular sintering furnace, sinter at 600°C for 8 hours in a nitrogen atmosphere, and cool naturally to room temperature to obtain the core-shell structure lithium-ion battery positive and negative materials Manganese pyrophosphate.

[0039]After testing, the manganese pyrophosphate anode material of the obtained core-shell structure lithium...

Embodiment 3

[0042] (1) Mix 0.05mol disodium manganese EDTA and 0.05mol ammonium phosphate, and dissolve them in 1000mL deionized water to obtain a mixed solution;

[0043] (2) Adjust the pH value of the mixed solution obtained in step (1) to 5;

[0044] (3) Place the mixed solution after pH adjustment in step (2) in a constant temperature water bath at 90°C, and mechanically stir for 10 hours to form a uniform gel;

[0045] (4) Place the gel obtained in step (3) in a vacuum oven at 80°C and dry for 12 hours to obtain the manganese pyrophosphate precursor;

[0046] (5) Place the manganese pyrophosphate precursor obtained in step (4) in a tubular sintering furnace, sinter at 400°C for 12 hours in an argon atmosphere, and cool naturally to room temperature to obtain coke, a negative electrode material for lithium-ion batteries with a core-shell structure. manganese phosphate.

[0047] After testing, the obtained manganese pyrophosphate, the negative electrode material of the lithium-ion ba...

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Abstract

The invention relates to a Mn2P2O7 anode material of a core-shell structured lithium ion battery and a preparation method thereof. The Mn2P2O7 is prepared according to the following steps of: (1) dissolving an organic manganese source and a phosphorus source in deionized water to obtain a mixed solution; (2) adjusting a pH value to be 3 to 8; (3) placing the solution in a water bath at 60 to 90 DEG C, and stirring the solution for 10 to 30 hours to form uniform gel; (4) drying the gel for 4 to 15 hours at 60 to 110 DEG C to obtain a Mn2P2O7 precursor; and (5) placing the Mn2P2O7 precursor in a non-oxidizing atmosphere, sintering the Mn2P2O7 precursor at 350 to 700 DEG C for 4 to 14 hours, and cooling the product to the room temperature, thereby obtaining the Mn2P2O7 anode material of the core-shell structured lithium ion battery. The nanometer rod of the Mn2P2O7 is of a core-shell structure and has high specific area, thereby being favorable for ion transmission and infiltration of an electrolyte to an electrode material; and moreover, the conductivity of the nanometer rod is greatly improved due to uniformly-coated amorphous carbon, and the electrochemical performance of the material is excellent.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery and a preparation method thereof, in particular to manganese pyrophosphate, a negative electrode material of a lithium ion battery with a core-shell structure, and a preparation method thereof. Background technique [0002] The energy density of lithium-ion batteries mainly depends on the output voltage and specific capacity, which in turn depend on the electrochemical properties of electrode materials. One of the keys to developing an ideal lithium-ion battery is to find a suitable electrolytic material. Among them, the negative electrode material is lithium The key material of ion electrode material. The development of low-voltage, high-capacity, long-life, safe and stable anode materials is the top priority of many researchers. Due to the low capacity of traditional graphite negative electrode (372mAh / g), the development of lithium-ion batteries to high-capacity targets...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 张佳峰郑俊超韩亚东张宝童汇彭春丽朱玉时
Owner CENT SOUTH UNIV