Lithium iron phosphate modified composite material and preparation method thereof

A composite material, lithium iron phosphate technology, applied in the direction of electrode manufacturing, active material electrode, electrode heat treatment, etc., can solve the problems of low ion diffusivity, narrow electronic conductivity, etc., to increase specific surface area, improve electronic conductivity, good The effect of conductivity

Active Publication Date: 2020-09-15
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention intends to provide a lithium iron phosphate modified composite material to solve the low ion diffusivity of the existing LiFePO4 material , electronic conductivity and narrow operating voltage range

Method used

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  • Lithium iron phosphate modified composite material and preparation method thereof
  • Lithium iron phosphate modified composite material and preparation method thereof
  • Lithium iron phosphate modified composite material and preparation method thereof

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Experimental program
Comparison scheme
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Embodiment 1

[0029] Embodiment 1: A lithium iron phosphate modified composite material, the lithium iron phosphate modified composite material includes: LiCo x mn y Fe (1-x-y) PO 4 / Metal elemental Ni / graphene, wherein, x=0.1, y=0.1.

[0030] For the above-mentioned lithium iron phosphate modified composite material, its preparation method comprises the following steps:

[0031] Step 1. Disperse the lithium source, iron source, manganese source, cobalt source, and phosphorus source in absolute ethanol, and ball mill in a ball mill for 5 hours at a speed of 300r / min; pre-sinter at 500°C for 2 hours, and then cool down to At room temperature, the material LiCo 0.1 mn 0.1 Fe 0.8 PO 4 , the particle size is 0.5 μm;

[0032] In this scheme, the lithium source is lithium hydroxide, the iron source is ferric phosphate, the manganese source is manganese acetate, the cobalt source is cobalt acetate, and the phosphorus source is phosphoric acid;

[0033] Step 2, the LiCo prepared in step 10...

Embodiment 2

[0037] Embodiment 2: a kind of lithium iron phosphate modified composite material, described lithium iron phosphate modified composite material comprises: LiCo x mn y Fe (1-x-y) PO 4 / Metal simple substance Ag / graphene, wherein, x=0.1, y=0.9.

[0038] For the above-mentioned lithium iron phosphate modified composite material, its preparation method comprises the following steps:

[0039] Step 1. Disperse the lithium source, iron source, manganese source, cobalt source, and phosphorus source in absolute ethanol, and ball mill in a ball mill for 5 hours at a speed of 700r / min; pre-sinter at 700°C for 2 hours, and then cool in the furnace to At room temperature, the material LiCo 0.1 mn 0.9 PO 4 , the particle size is 100nm;

[0040] In this scheme, lithium source selects lithium carbonate, iron source selects ferrous oxalate, manganese source selects manganese nitrate, cobalt source selects cobalt nitrate, phosphorus source selects diammonium phosphate;

[0041] Step 2, ...

Embodiment 3

[0045] Embodiment 3: a kind of lithium iron phosphate modified composite material, described lithium iron phosphate modified composite material comprises: LiCo x mn y Fe (1-x-y) PO 4 / Metal elemental Cu / graphene, wherein, x=0.4, y=0.5.

[0046] For the above-mentioned lithium iron phosphate modified composite material, its preparation method comprises the following steps:

[0047] Step 1. Disperse the lithium source, iron source, manganese source, cobalt source, and phosphorus source in absolute ethanol, and ball mill in a ball mill for 10 hours at a speed of 500r / min; pre-sinter at 600°C for 2.5 hours, and then cool in the furnace to room temperature, the material LiCo 0.4 mn 0.5 Fe 0.1 PO 4 ;

[0048] The lithium source is lithium carbonate, the iron source is ferrous acetate, the manganese source is manganese acetate, the cobalt source is cobalt oxalate, and the phosphorus source is diammonium phosphate;

[0049] Step 2, the LiCo prepared in step 1 0.4 mn 0.5 Fe ...

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Abstract

The invention discloses a lithium iron phosphate modified composite material in the field of lithium-ion batteries, the lithium iron phosphate modified composite material comprises LiCoxMnyFe(1-x-y)PO4 / metal M / graphene, and x+y is greater than or equal to 0.2 and less than or equal to 1. According to the invention, a conductive metal layer and a grapheme coating conductive layer are formed on thesurface of a phosphate-based material (LiCoxMnyFe(1-x-y)PO4). On one hand, the metal conductive layer has good conductivity; the graphene coating layer has a three-dimensional conductive network structure; the surface electronic conductivity of the LiCoxMnyFe(1-x-y) PO4 material can be synergistically improved, the ion migration resistance is reduced, and the power output capability is improved; and on the other hand, the graphene coating conductive layer can stabilize the crystal structure of the LiCoxMnyFe(1-x-y)PO4 material during high-voltage working and reduce the dissolution of transition metal ions in the electrolyte, so that the phosphate-based material realizes high-rate stable cyclic output in a high-working-voltage region (the working voltage range is greater than 4.1 V).

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium iron phosphate modified composite material and a preparation method thereof. Background technique [0002] With the large-scale use of lithium-ion batteries in electric energy storage devices, electric vehicles and power tools, lithium-ion cathode materials, as the key factors affecting the cycle life, safety and high energy density of lithium-ion batteries, have become the focus of lithium-ion battery research. Lithium iron phosphate (LiFePO 4 ) Cathode materials are widely used due to their high electrochemical activity, safety performance and cycle performance. However, LiFePO 4 The material has low electrical conductivity, low voltage plateau, low energy density, and the presence of Fe in the synthesis process 2+ easily oxidized to Fe 3+ And other problems, the biggest bottleneck restricting its development and application. [0003] The current research on ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M4/58H01M10/0525H01M4/38H01M4/62
CPCH01M4/0471H01M4/364H01M4/5825H01M4/625H01M10/0525H01M4/38H01M2004/028H01M2004/021Y02E60/10
Inventor 王畅张红梅苟敏涛陈晓涛刘富亮石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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