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Preparation method of spherical lithium manganese phosphate/carbon composite material

A carbon composite material, lithium manganese phosphate technology, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., can solve problems such as poor charge and discharge performance, improve electrical conductivity, good rate performance, The effect of good electronic conductivity

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

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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to solve the problem of poor cycle performance of existing lithium manganese phosphate materials and poor charge and discharge performance at high rates. The present invention provides a method for preparing spherical lithium manganese phosphate / carbon composite materials

Method used

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  • Preparation method of spherical lithium manganese phosphate/carbon composite material
  • Preparation method of spherical lithium manganese phosphate/carbon composite material
  • Preparation method of spherical lithium manganese phosphate/carbon composite material

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specific Embodiment approach 1

[0011] Specific implementation mode one: the spherical lithium manganese phosphate / carbon composite material in this embodiment mode, the lithium manganese phosphate material includes the molecular formula LiMn 1-x m x PO 4 All manganese phosphate lithium-based materials, where 0≤x≤0.2, M is selected from one or both of the transition metal elements Ru and Rh. Lithium manganese phosphate precursor is prepared by using manganese source compound, phosphorus source compound, lithium source compound, doping compound and organic small molecule carbon source as raw materials, and then the precursor is heat-treated by controlled crystallization roasting process to obtain lithium manganese phosphate / carbon composite Primary nanoparticles of materials. A ball forming agent and a dispersant are added to the nanometer material, a uniformly mixed slurry is obtained through wet high-energy ball milling, and the slurry is spray-dried to obtain a spherical lithium manganese phosphate / carbo...

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment is different from Embodiment 1 in that the manganese source compound is one or more of manganese nitrate, manganese chloride, manganese sulfate, or manganese acetate. Other parameters are the same as in the first embodiment.

[0013] 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

[0014] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the phosphorus source compound is one or more of ammonium dihydrogen phosphate, diammonium hydrogen phosphate or phosphoric acid. Other parameters are the same as those in Embodiment 1 or Embodiment 2.

[0015] In this embodiment, when the phosphorus source compound is a mixture of two or more of the above raw materials, they are mixed in any ratio.

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Abstract

The invention relates to a preparation method of a spherical lithium manganese phosphate / carbon composite material, wherein the lithium manganese phosphate material comprises all lithium manganese phosphate base materials which accord with the molecular formula LiMn1-xMxPO4. The preparation method comprises the following steps: using a manganese source compound, a phosphorus source compound, a lithium source compound, a doped compound and a small organic molecule carbon source as raw materials to prepare a lithium manganese phosphate precursor, and carrying out heat treatment on the precursor by the controlled crystallization roasting technology to obtain primary nano-particles of the lithium manganese phosphate / carbon composite material. By addition of the small organic molecule carbon source, electronic conductivity of the lithium manganese phosphate material is improved, and high current charge-discharge capability of the material is effectively enhanced. By introduction of doped ion, lattice distortion caused by Jahn-Teller effect is effectively inhibited, and cycle performance of the lithium manganese phosphate material is improved. The prepared spherical lithium manganese phosphate / capacitor carbon composite material has advantages of high energy density, high power density and good cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a spherical 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. The reported patents of lithium manganese phosphate are still based on the solid phase method. The particle size of lithium manganese phosphate material prepared by this method is relatively large, the phenomenon of agglomeration is serious, and the electrochemical performance is not satisfactory. How to effectively improve the tap density of materials is still one of the most urgent pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 初园园李龙
Owner TIANJIN POLYTECHNIC UNIV
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