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Preparation method of lithium manganese phosphate/carbon composite material

A carbon composite material, lithium manganese phosphate technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as poor charging and discharging performance, and achieve the effects of improving conductivity, increasing diffusion rate, and improving charging and discharging performance.

Inactive Publication Date: 2015-09-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing lithium manganese phosphate material has poor charge and discharge performance at high rates. The present invention provides a preparation method of lithium manganese phosphate / carbon composite material

Method used

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specific Embodiment approach 1

[0008] Specific Embodiment 1: The lithium manganese phosphate / carbon composite material in this embodiment is prepared by mixing manganese source compound, doping compound and ammonium phosphate compound into a compound with the molecular formula NH 4 mn 1-x m x PO 4 , wherein 0≤x≤0.2, M is selected from any one or several of Co, Fe, Mg, Ni, and the dispersant is an organic solvent; then NH 4 mn 1-x m x PO 4 The precursor and the lithium salt compound are mixed evenly and then transferred to a hydrothermal kettle, reacted at a certain temperature for an appropriate time, and then dried to obtain lithium manganese phosphate material; finally, the small molecule carbon source and lithium manganese phosphate material are mixed evenly, and heat treatment is used to in situ Carbon-coated lithium manganese phosphate / carbon composites were prepared. Among them, the molar ratio of Mn, P and Li in the manganese source compound, ammonium phosphate compound and lithium source compo...

specific Embodiment approach 2

[0009] Embodiment 2: This embodiment is different from Embodiment 1 in that the manganese source compound is one or more of manganese chloride, manganese sulfate, or manganese acetate. Other parameters are the same as in the first embodiment.

[0010] In the present embodiment, when the manganese source compound is a mixture of two or more of the aforementioned raw materials, they are mixed in an arbitrary ratio.

specific Embodiment approach 3

[0011] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the ammonium phosphate compound is one or more of ammonium dihydrogen phosphate, diammonium hydrogen phosphate or triammonium phosphate. Other parameters are the same as those in Embodiment 1 or Embodiment 2.

[0012] In the present embodiment, when the ammonium phosphate-based compound is a mixture of two or more of the above raw materials, they are mixed in an arbitrary ratio.

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Abstract

The invention relates to a preparation method of a lithium manganese phosphate / carbon composite material so as to solve the problem that charge-discharge property is poor when a lithium manganese phosphate material prepared by an existing method has high magnification. The preparation method provided by the invention comprises the following steps: mixing a manganese source compound, doped compound and an ammonium phosphate compound (including ammonium biphosphate, diammonium phosphate and triammonium phosphate) by an ultrafine sand milling method to prepare a precursor with the molecular formula being NH4Mn1-xMxPO4, wherein x is less than or equal to 0.2 and greater than or equal to 0, M is any one or more elements selected from Co, Fe, Mg and Ni, and a dispersant is an organic solvent; then, uniformly mixing the NH4Mn1-xMxPO4 precursor and a lithium compound, transferring the mixture into a hydrothermal kettle, reacting at a certain temperature for an appropriate period of time, and drying to obtain a lithium manganese phosphate material; and finally, preparing the lithium manganese phosphate / carbon composite material by a thermal-treatment in-situ carbon-coating method. According to the invention, the preparation process is simple and cost is low. The prepared lithium manganese phosphate / carbon composite material has good charge-discharge property and cycle performance.

Description

technical field [0001] The invention relates to a preparation method of lithium manganese phosphate / carbon composite material. Background technique [0002] Lithium-ion batteries are currently the most ideal power system for driving electric vehicles and hybrid vehicles. Compared with other lithium-ion battery cathode materials, lithium manganese phosphate has a higher theoretical capacity and discharge voltage platform, good safety and low cost, and is environmentally friendly. And other advantages, it is considered to be an ideal cathode material for automotive power batteries. However, the inherent ion diffusion rate and low electronic conductivity of lithium manganese phosphate materials also restrict its practical application. The current improvement measures mainly focus on the surface conductive carbon material coating of lithium manganese phosphate materials, which improves to a certain extent. The conductivity of the lithium manganese phosphate material was improve...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/362H01M4/5825H01M4/62Y02E60/10
Inventor 初园园李龙
Owner TIANJIN POLYTECHNIC UNIV
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