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Preparation method of three-dimensional porous graphene modified LFP powder

A graphene-modified, three-dimensional porous technology, used in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as low performance at large rates, reduce side reactions, improve diffusion rates, and achieve good electrochemical performance. Effect

Inactive Publication Date: 2017-11-24
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention mainly solves the problem of low large-rate performance of LFP / C composite materials prepared in the traditional solid-state method, and can prepare C@LFP / G with high-rate performance under large-rate conditions through the soft chemical-rheological phase method composite material

Method used

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  • Preparation method of three-dimensional porous graphene modified LFP powder
  • Preparation method of three-dimensional porous graphene modified LFP powder
  • Preparation method of three-dimensional porous graphene modified LFP powder

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1: A preparation method of C@LFP / G (1% G), the steps are as follows:

[0034] a. The raw material FeC 2 o 4 2H 2 O, NH 4 h 2 PO 4 、LiCO 3 With acetone according to the ratio of 3.6g: 2.3g: 0.74g: 40g, add 0.63g of glucose, add 0.063g of graphene, perform intermittent high-speed ball milling in a high-energy ball mill, run for 10 minutes every time, intermittently for 30 s, and then reverse For 10 minutes, choose a ceramic ball mill pot, the material ball is Φ 5 mm agate ball, the ball material ratio is 3:10, the control speed is 600 r / min, and the time is 6 hours to form a rheological phase mixture;

[0035] b. volatilize the acetone from the rheological phase mixture obtained in step (a) at 50° C. in a blast drying oven to form a solid precursor;

[0036] c. Put the solid precursor obtained in step (b) into a vacuum drying oven, set the temperature at 80°C, dry it in vacuum for 20 hours, and cool it down to room temperature naturally to obtain a flaky soli...

Embodiment 2

[0043] Example 2: A preparation method of a C@LFP / G (3% G) composite material, the steps are as follows:

[0044] a. The raw material FeC 2 o 4 2H 2 O, NH 4 h 2 PO 4 、LiCO 3 With acetone according to the ratio of 3.6g: 2.3g: 0.74g: 40g, add 0.63g of glucose, 0.19g of graphene in a high-energy ball mill for intermittent high-speed ball milling, every 10 minutes of operation, intermittent 30s, and then reverse 10 min, choose a ceramic ball mill pot, the material ball is Φ 5 mm agate ball, the ball material ratio is 3:10, the control speed is 600 r / min, and the time is 6 h to form a rheological phase mixture;

[0045] b. volatilize the acetone from the rheological phase mixture obtained in step (a) at 50° C. in a blast drying oven to form a solid precursor;

[0046] c. Put the solid precursor obtained in step (b) into a vacuum drying oven, set the temperature at 80°C, dry it in vacuum for 20 hours, and cool it down to room temperature naturally to obtain a flaky solid prec...

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PUM

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Abstract

The invention discloses a preparation method of a three-dimensional porous graphene modified LiFePO4 (LFP) positive electrode material. The preparation method comprises the steps of ball-milling an iron source, a lithium source and a phosphorus source which are selected according to a certain proportion, performing intermittent ball-milling by taking acetone as a medium and glucose and graphene as a carbon source and by a planetary ball-milling machine, performing vacuum fixed-temperature drying, and performing high-temperature calcination under a protection atmosphere, thereby obtaining a C@LFP / G composite material with fine particle granularity. The obtained C@LFP / G composite material has a crystal phase structure same as a pure phase material and has excellent electrochemical performance, and the process is simple to operate and is suitable for industrial production on a large scale.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of a three-dimensional porous graphene-modified LFP powder. Background technique [0002] In the past two decades, lithium-ion batteries (LIBs) have been widely used in electric vehicles (EVs), plug-in hybrid electric vehicles (HEVs) and large-scale energy storage due to their high energy density, high efficiency, light weight and portability. Revolutionary changes took place. However, these new applications require LIB electrode materials with higher energy and higher power capabilities, and at the same time, the electrode materials must be low-cost and environmentally friendly. Generally speaking, the performance of the electrode material directly affects the performance of the lithium-ion battery, and its cost also directly determines the cost of the battery. Therefore, to meet this demand, the rate perform...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 冯志军王旭峰
Owner NANCHANG HANGKONG UNIVERSITY
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