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Metal-doped oxidative conductive carbon black cladded lithium manganese phosphate and preparation method thereof

A technology of black-coating lithium manganese phosphate and oxidized conductive carbon black, which is applied in circuits, electrical components, battery electrodes, etc., can solve the problems of poor batch stability of lithium manganese phosphate, large amount of carbon source added, and low specific capacity, etc. problems, to achieve the effects of regular crystal lattice, good cycle performance and uniform particle size

Active Publication Date: 2014-02-19
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the problems of poor batch stability of lithium manganese phosphate coated with carbon materials in the prior art, difficulty in dispersion during pulping, excessive addition of carbon source, and low specific capacity, and provides a high gram capacity , good rate performance and good cycle stability, metal-doped oxide conductive carbon black coated lithium manganese phosphate that is easy to disperse in water

Method used

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  • Metal-doped oxidative conductive carbon black cladded lithium manganese phosphate and preparation method thereof
  • Metal-doped oxidative conductive carbon black cladded lithium manganese phosphate and preparation method thereof
  • Metal-doped oxidative conductive carbon black cladded lithium manganese phosphate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Preparation of oxidized conductive carbon black

[0046] (1) Anneal the conductive carbon black at 270°C for 15h.

[0047] (2) Soak the conductive carbon black obtained in step (1) in a strong oxidizing agent, the strong oxidizing agent is 10mol / L nitric acid solution, the soaking temperature is 60°C, and the mass ratio of conductive carbon black to nitric acid solution is 1:40, After filtering, the filter residue is washed until the pH is neutral, and finally dried to obtain oxidized conductive carbon black.

[0048] (2) Preparation of metal-doped oxidized conductive carbon black coated lithium manganese phosphate

[0049] (a) Weigh the lithium source compound, manganese source compound, phosphorus source compound and metal dopant according to the ratio of lithium element: manganese element: phosphorus element: metal doping element molar ratio of 1:0.999:1:0.001, wherein The lithium source compound is lithium dihydrogen phosphate, the manganese source compound is...

Embodiment 2

[0065] (1) Preparation of oxidized conductive carbon black

[0066] (1) Anneal the conductive carbon black at 280°C for 13h.

[0067] (2) Add the conductive carbon black obtained in step (1) into a strong oxidizing agent for soaking. The strong oxidizing agent is a mixed solution composed of 10mol / L nitric acid solution and 10mol / L sulfuric acid solution in a mass ratio of 1:3, and the soaking temperature is 70°C , the mass ratio of conductive carbon black to the mixed solution is 1:30. After filtration, the filter residue is washed until the pH is neutral, and finally dried to obtain oxidized conductive carbon black.

[0068] (2) Preparation of metal-doped oxidized conductive carbon black coated lithium manganese phosphate

[0069] (a) Weigh the lithium source compound, manganese source compound, phosphorus source compound and metal dopant according to the ratio of lithium element: manganese element: phosphorus element: metal doping element molar ratio of 1:0.9:1:0.1, wherei...

Embodiment 3

[0074] (1) Preparation of oxidized conductive carbon black

[0075] (1) Anneal the conductive carbon black at 290°C for 12h.

[0076] (2) Add the conductive carbon black obtained in step (1) to soak in a strong oxidant, the strong oxidant is ammonium persulfate solution with a mass concentration of 20g / L, the soaking temperature is 25°C, the mass ratio of conductive carbon black to the mixed solution The ratio is 1:50. After filtration, the filter residue is washed until the pH is neutral, and finally dried to obtain oxidized conductive carbon black.

[0077] (2) Preparation of metal-doped oxidized conductive carbon black coated lithium manganese phosphate

[0078] (a) Weigh lithium source compound, manganese source compound, phosphorus source compound and metal dopant according to the ratio of lithium element: manganese element: phosphorus element: metal doping element molar ratio of 1:0.95:1:0.05, wherein The lithium source compound is formed by mixing lithium dihydrogen p...

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Abstract

The invention discloses metal-doped oxidative conductive carbon black cladded lithium manganese phosphate which is prepared by taking a lithium source compound, a manganese source compound, a phosphorus source compound, a metal dopant and a carbon source as raw materials, wherein the carbon source is oxidative conductive carbon black; the metal-doped oxidative conductive carbon black cladded lithium manganese phosphate has a chemical formula of LiMxMn[1-x]PO4 / C, wherein M is a metal doped element and is not less than 0.001 and not more than 0.1. The metal-doped oxidative conductive carbon black cladded lithium manganese phosphate is high in capacity, excellent in performance, good in circling stability and easy to disperse in water. The invention also provides a preparation method of the metal-doped oxidative conductive carbon black cladded lithium manganese phosphate. The preparation method mainly comprises the following steps: (1) preparing the oxidative conductive carbon black; and (2) preparing the metal-doped oxidative conductive carbon black cladded lithium manganese phosphate. The preparation method is simple in step and low in cost; the prepared metal-doped oxidative conductive carbon black cladded lithium manganese phosphate product is uniform in grain size, high in purity and excellent in electrochemical performance.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a metal-doped oxidized conductive carbon black coated lithium manganese phosphate and a preparation method thereof. [0002] Background technique [0003] Electrode materials with electrochemical activity can be used in the production and manufacture of lithium-ion batteries. Among them, the commonly used positive electrode materials for lithium-ion batteries include lithium cobaltate, lithium nickelate, spinel lithium manganate, and ternary nickel-cobalt lithium manganate. wait. Among them, lithium cobaltate is commonly used in small lithium-ion batteries, but cobalt resources are scarce, expensive, and unstable under high current and overcharge conditions, which is very unsafe; the crystal structure of lithium nickelate is stable, but it is relatively safe. Poor; the cycle performance of lithium manganate is poor, especially under high temperature cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/5825H01M4/62H01M4/625Y02E60/10
Inventor 朱伟徐琛包大新
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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