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Lithium manganese iron phosphate composite positive electrode material and preparation method, positive electrode and lithium battery

A composite positive electrode material, lithium manganese iron phosphate technology, applied in the direction of nanotechnology for materials and surface science, phosphorus compounds, secondary batteries, etc., can solve the problem of low discharge capacity, poor cycle retention rate and conductivity Not high problems, to achieve the effect of improving electrochemical performance, increasing electrical conductivity, and reducing volume resistivity

Active Publication Date: 2017-04-26
FOSHAN DYNANONIC +1
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  • Abstract
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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a lithium manganese iron phosphate composite positive electrode material and a preparation method thereof, so as to solve the problem of the low electrical conductivity of the existing lithium manganese iron phosphate positive electrode material and the preparation of lithium-ion battery discharge Technical problems of low capacity and poor cycle retention

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  • Lithium manganese iron phosphate composite positive electrode material and preparation method, positive electrode and lithium battery
  • Lithium manganese iron phosphate composite positive electrode material and preparation method, positive electrode and lithium battery
  • Lithium manganese iron phosphate composite positive electrode material and preparation method, positive electrode and lithium battery

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preparation example Construction

[0031] Correspondingly, the embodiment of the present invention also provides a preparation method of the above-mentioned lithium manganese iron phosphate composite positive electrode material. For the process flow of this method, please refer to figure 1 . The preparation method of lithium manganese iron phosphate composite cathode material comprises the following steps:

[0032] Step S01: According to the molar ratio of each element of lithium manganese iron phosphate, adding nano-scale lithium source, manganese source, iron source, and phosphorus source into the solvent for dissolving treatment, to obtain a transparent solution A;

[0033] Step S02: adding a complexing agent to the transparent solution A prepared in step S01, and performing mixing treatment to obtain a mixed solution B;

[0034] Step S03: adding a graphyne solution to the mixed solution B prepared in step S02, and performing mixing treatment to obtain a mixed solution C;

[0035] Step S04: drying the mixe...

Embodiment 1

[0056] A lithium manganese iron phosphate composite positive electrode material and a preparation method thereof, the preparation method comprising the following steps:

[0057] Step S11: After the battery-grade raw materials lithium carbonate, manganese nitrate, iron nitrate, ammonium dihydrogen phosphate, ethylenediaminetetraacetic acid, and ethyl acetate were treated by a sand mill for 30 minutes, the molar ratio was Li:Mn:Fe:P= 1.1:0.8:0.2:1 for weighing (theoretical product is 1 mole), and sequentially dissolved in deionized water and oxalic acid, magnetically stirred until a transparent solution A is formed;

[0058] Step S12: Weigh 10 g of ethylenediaminetetraacetic acid and add it to solution A, and stir magnetically. When the color of the solution turns dark brown, add 4 g of ethyl acetate, and stir magnetically for 1 hour to form mixed solution B;

[0059] Step S13: ultrasonically disperse 0.5 g of graphdiyne in ethanol solvent for 1 h to form solution C;

[0060] S...

Embodiment 2

[0065] A lithium manganese iron phosphate composite positive electrode material and a preparation method thereof, the preparation method comprising the following steps:

[0066] Step S21: After the battery-grade raw materials lithium carbonate, manganese nitrate, iron nitrate, ammonium dihydrogen phosphate, ethylenediaminetetraacetic acid, and ethyl acetate were treated by a sand mill for 30 minutes, the molar ratio was Li:Mn:Fe:P= 1.1:0.8:0.2:1 for weighing (theoretical product is 1 mole), and sequentially dissolved in deionized water and oxalic acid, magnetically stirred until a transparent solution A is formed;

[0067] Step S22: Weigh 12 g of organic carbonate and add it to solution A, and stir magnetically. When the color of the solution turns dark brown, add 5 g of ethyl acetate, and stir magnetically for 1 hour to form mixed solution B;

[0068] Step S23: ultrasonically disperse 0.5 g of graphdiyne in ethanol solvent for 1 h to form solution C;

[0069] Step S24: addin...

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Abstract

The invention discloses a lithium iron manganese phosphate composite positive electrode material and a preparation method thereof, a lithium battery positive electrode and a lithium battery. The size of the lithium iron manganese phosphate composite positive electrode material is nano-scale, graphdiyne is compounded in a lithium iron manganese phosphate base material, and the mass of the graphdiyne is 0.1-10% that of the lithium iron manganese phosphate base material. The preparation method comprises the steps of dissolving nano-scale lithium source, manganese source, iron source and phosphorus source in a solvent according to the molar ratio of the elements of lithium iron manganese phosphate to form a solution, sequentially adding a complexing agent and a graphdiyne solution into the solution, then drying, grinding, sintering and annealing. Both the lithium battery positive electrode and the lithium battery contain the lithium iron manganese phosphate composite positive electrode material. According to the lithium iron manganese phosphate composite positive electrode material, the migration paths of Li<+> and electrons are shortened by reducing the primary particle size, so that the electric conductivity of the material is improved. According to the preparation method, the performance stability of the lithium iron manganese phosphate composite positive electrode material can be ensured. The discharge gram volume and circulating volume retention rate of the lithium battery is high.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium manganese iron phosphate composite positive electrode material and a preparation method thereof, a lithium battery positive electrode and a lithium battery. Background technique [0002] In recent years, lithium-ion battery cathode materials LiFePO 4 Because of its wide source of raw materials, cheap price, excellent thermal stability, good cycle performance, safety and non-toxicity, etc., it has attracted much attention and is considered to be an ideal anode material for a new generation of lithium-ion batteries. However, LiFePO 4 The lower discharge voltage platform (about 3.4V) makes its energy density lower and limits its development and application. [0003] with LiFePO 4 LiMnPO with the same structure 4 relative to Li + The electrode potential of Li / Li is 4.1V, which is much higher than that of LiFePO 4 The voltage platform is within the electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00C01B25/45H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 孔令涌尚伟丽黄永侃陈玲震许燕平
Owner FOSHAN DYNANONIC
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