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Carbon-coated and Na <+>-doped LiMnPO4 positive electrode material as well as preparation method and application thereof

A positive electrode material, NH4H2PO4 technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., to achieve the effect of abundant raw material sources, low price, and uniform particle size distribution

Inactive Publication Date: 2020-05-15
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method is only for LiMnPO 4 Carbon coating or LiFePO 4 Doped with Na + , while carbon coating and Na + Preparation of LiMnPO by doping 4 The method of cathode material has not been reported yet

Method used

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  • Carbon-coated and Na &lt;+&gt;-doped LiMnPO4 positive electrode material as well as preparation method and application thereof
  • Carbon-coated and Na &lt;+&gt;-doped LiMnPO4 positive electrode material as well as preparation method and application thereof
  • Carbon-coated and Na &lt;+&gt;-doped LiMnPO4 positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh Li respectively according to the molar ratio of 1:2:2 2 CO 3 1.4778g, MnCO 3 4.598g, NH 4 h 2 PO 4 4.6008g, according to the product LiMnPO 4 10% of carbon content weighs 1.64g of sodium polyacrylate. Put the above raw materials into a ball milling jar, add absolute ethanol as a dispersant to 1 / 3 of the height of the ball milling jar, and perform ball milling. After ball milling for 6 hours, dry in an oven at 70°C for 8 hours. After grinding evenly, burn at 550°C for 8 hours at a heating rate of 5°C / min in a nitrogen-filled tube furnace to obtain carbon-coated and Na + Doped LiMnPO 4 Cathode material (LNMP@C).

Embodiment 2

[0039] Weigh Li respectively according to the molar ratio of 1:2:2 2 CO 3 1.4778g, MnCO 3 4.598g, NH 4 h 2 PO 4 4.6008g, according to the product LiMnPO 4 5%, 15%, and 20% of the carbon content take by weighing sodium polyacrylate 0.82g, 2.46g, 3.28g respectively, and prepare carbon-coated and Na polyacrylates with different carbon contents in the same manner as in Example 1 + Doped LiMnPO 4 Cathode material (LNMP@C).

Embodiment 3

[0041] As a comparison, select polyacrylic acid as the carbon source, weigh 0.37g, 0.73g, 1.10g, and 1.47g of polyacrylic acid respectively, and prepare different carbon contents (5, 10, 15, 20wt%) according to the same method as in Example 1. Carbon coated LiMnPO 4 Cathode material (LMP / C).

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Abstract

The invention relates to a carbon-coated and Na <+>-doped LiMnPO4 positive electrode material as well as a preparation method and application of the carbon-coated and Na <+>-doped LiMnPO4 positive electrode material. The preparation method comprises the following steps of carrying out ball milling on Li2CO3, MnCO3, NH4H2PO4 and sodium polyacrylate, and preparing the sodium-doped LiMnPO4 (at) C material by adopting a high-temperature reduction method, wherein the purposes of coating carbon and doping metal Na < + > can be achieved at the same time by utilizing the sodium polyacrylate. Polypropylene is used as a carbon source, and LiMnPO4 / C prepared through high-temperature solid-phase reduction is used as a contrast material. The sodium-doped LiMnPO4 (at) C material has a better olivine structure, a good crystal form and uniform particle size distribution, and the electrochemical properties of the sodium-doped LiMnPO4 (at) C material at all aspects are greatly improved compared with those of LiMnPO4 / C which is not doped with sodium. The first specific discharge capacity of the sodium-doped LiMnPO4 (at) C material at 0.1 C is as high as 152mAh g <-1 >, and the cycle performance is good. The method is a novel and practical method for preparing the lithium ion battery positive electrode material sodium-doped LiMnPO4 (at) C through carbon coating and Na < + > doping in one step.

Description

technical field [0001] The invention relates to the field of synthesis and performance improvement of lithium-ion battery cathode materials, in particular to a carbon-coated and Na + Doped LiMnPO 4 Cathode materials, and the ability to achieve carbon coating and Na + Preparation of LiMnPO by doping 4 Preparation methods and applications of cathode materials. Background technique [0002] Energy, environmental issues and information technology have become three research hotspots in the 21st century. Since the beginning of human civilization, energy research aimed at providing people with a comfortable life has been carried out, and its fields involve fossil fuels, nuclear energy, solar energy, etc. Since entering the information age, research on more efficient, more convenient, safer and pollution-free energy has emerged. At present, the internal combustion engine consumes one-third of the annual energy required by human beings, and is the main consumption mode of fossil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 赵红沈昱丁伟元刘德宠王颖捷刘碧娇
Owner DALIAN JIAOTONG UNIVERSITY
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