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

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...

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

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