Lithium ion battery positive electrode material and preparation method thereof

A technology for lithium ion batteries and cathode materials, applied in the field of new energy materials and their preparation, can solve the problems that the rate performance and structural stability of lithium iron manganese phosphate cannot be fully improved, and the interaction and affinity of lithium iron manganese phosphate are poor. The effect of improving ion and electron transport ability, enriching surface functional groups, and improving structural stability

Active Publication Date: 2022-04-12
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the surface coating of the above conductive materials can enhance the conductivity of lithium manganese iron phosphate to a certain extent, the interaction and affinity between these materials and lithium manganese iron phosphate are poor, and the rate performance and structure of lithium manganese iron phosphate cannot be fully improved. stability

Method used

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  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0023] The Ti of lithium ion battery cathode material of the present invention 3 C 2 The preparation method of MXene-coated manganese iron phosphate material is to add phosphorus source and lithium source to deionized water / PEG solution to form suspension A, manganese source, iron source, antioxidant and Ti 3 C 2MXene is added to deionized water to form suspension B, and under continuous stirring conditions, suspension B is added dropwise to suspension A to form a mixed solution, and then the mixed solution is transferred to a hydrothermal reaction kettle and kept at a certain temperature for a period of time. After the reaction is completed, the product is separated by centrifugation, washed and dried, and finally the dried product is sintered in an atmosphere furnace to obtain Ti 3 C 2 MXene coated lithium manganese iron phosphate material. The method includes the following specific steps:

[0024] (1) Add phosphorus source and lithium source to deionized water / PEG sol...

Embodiment 1

[0038] Phosphoric acid and lithium hydroxide were added to the deionized water / PEG solution with a volume ratio of 2:1 to form suspension A, followed by manganese sulfate, ferrous sulfate, ascorbic acid and Ti 3 C 2 MXene is added to deionized water to form a suspension B, and under continuous stirring, the suspension B is added dropwise to the suspension A to form a mixed solution, wherein the element molar ratio Li of lithium source, manganese source, iron source and phosphorus source: Mn: Fe:P =3:0.8:0.2:2; Transfer the obtained mixture into a hydrothermal reactor, tighten the reactor and place it in an oven at 180°C for 10 hours. After the reaction is completed, centrifuge to separate the hydrothermal Product and it is dried under vacuum condition at 60 ℃ after washing; 2 Anneal at 650°C for 10 hours under atmosphere, and after the annealing is completed, black powder Ti 3 C 2 MXene coated lithium manganese iron phosphate material; Ti in this product 3 C 2 The cont...

Embodiment 2

[0040] Phosphoric acid and lithium hydroxide were added to the deionized water / PEG solution with a volume ratio of 2:1 to form suspension A, followed by manganese carbonate, ferrous chloride, ascorbic acid and Ti 3 C 2 MXene is added to deionized water to form a suspension B, and under continuous stirring, the suspension B is added dropwise to the suspension A to form a mixed solution, wherein the element molar ratio Li of lithium source, manganese source, iron source and phosphorus source: Mn: Fe:P = 3:0.5:0.5:2; transfer the obtained mixture into a hydrothermal reaction kettle, tighten the reaction kettle and place it in an oven at 140°C for 20h, and centrifuge to separate the hydrothermal reaction after the reaction is completed. Product and it is dried under vacuum condition at 80 ℃ after washing; 2 Anneal at 500°C for 20 hours in the atmosphere. After the annealing is completed, black powder Ti can be obtained. 3 C 2 MXene coated lithium manganese iron phosphate mate...

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Abstract

The invention relates to a lithium ion battery positive electrode material and a preparation method thereof, the positive electrode material is a Ti3C2 MXene coated lithium manganese iron phosphate material, and the Ti3C2 MXene is uniformly coated on the surfaces of lithium manganese iron phosphate nanoparticles to form a conductive network. The preparation method comprises the following steps: adding a phosphorus source and a lithium source into a deionized water/PEG solution to form a suspension A, adding a manganese source, an iron source, an antioxidant and Ti3C2 MXene into the deionized water to form a suspension B, dropwise adding the suspension B into the suspension A under a continuous stirring condition to form a mixed solution, transferring the mixed solution into a hydrothermal reaction kettle, preserving heat, and drying to obtain the Ti3C2 MXene/phosphorus dioxide composite material. And after the reaction is completed, centrifugally separating out a product, washing, drying and sintering. According to the invention, Ti3C2 MXene is used for carrying out surface coating on the lithium manganese iron phosphate material, so that the ion and electron transmission capability and the structural stability of the lithium manganese iron phosphate material are effectively improved, and the lithium manganese iron phosphate material is very suitable for being used as a high-energy and high-power-density lithium ion battery positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and their preparation, in particular to a Ti 3 C 2 The invention discloses a lithium ion battery cathode material and a preparation method thereof coated with MXene-coated manganese iron phosphate material, and the material can be used as a high-performance cathode material in lithium ion batteries. Background technique [0002] Olivine lithium iron phosphate (LiFePO 4 ) is one of the lithium-ion battery cathode materials that have been successfully commercialized. The advantages of high safety, long cycle life and low cost have made its market share in the power battery cathode material market continue to increase. However, lower specific capacity and working voltage (3.45Vvs.Li / Li + ) leads to LiFePO 4 It is difficult to further improve the energy density of power batteries. Lithium manganese iron phosphate (LiMn x Fe 1-x PO 4 ) with LiFePO 4 Similar to the olivine structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B25/45
CPCY02E60/10H01M4/58H01M4/36H01M10/0525H01M4/62C01B25/45
Inventor 曹名磊
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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