Lithium iron phosphate cathode material with carbon coating in situ and preparation method thereof

A carbon-coated lithium iron phosphate and cathode material technology, applied in the fields of nanomaterials and electrochemistry, can solve the problems of low electrode material capacity, poor high rate performance, short cycle life, etc., and achieve low charge mass transfer resistance and discharge capacity. High, growth-inhibiting effect

Active Publication Date: 2016-01-13
曹余良
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, LiFePO 4 The electronic conductivity of (10 -7 -10 -9 Scm -1 ) and ionic conductivity (~10 -16 em 2 the s -1 ) are low, and at the same time due to the LiFePO 4 / FePO 4 There is a phase transition to generate structural stress, so pure LiFePO 4 Electrode materials have the problems of low capacity, high polarization, poor high rate performance and short cycle life

Method used

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  • Lithium iron phosphate cathode material with carbon coating in situ and preparation method thereof
  • Lithium iron phosphate cathode material with carbon coating in situ and preparation method thereof
  • Lithium iron phosphate cathode material with carbon coating in situ and preparation method thereof

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Embodiment 1

[0030] Example 1, see Figure 1 to Figure 5 Shown:

[0031] The invention provides an in-situ carbon-coated lithium iron phosphate positive electrode material and a preparation method thereof, comprising the following steps (such as figure 1 shown):

[0032] 1) 1.26g ferrous oxalate dihydrate (FeC 2 o 4 2H 2 O), 2.56g oxalic acid (C 2 h 2 o 4 2H 2 O) join in 20mL distilled water, form yellow suspension solution;

[0033] 2) 0.75g lithium acetate (CH 3 COOLi·2H 2 O) was dissolved in 10 mL of distilled water to form a clear solution; 0.3 g of glucose (C 6 h 12 o 6 ·H 2 O) Dissolve in 10mL distilled water to form a clear solution; respectively add lithium acetate solution, 480 μL phosphoric acid, and glucose solution into the above yellow suspension (the molar ratio of lithium source to phosphorus source is 1.05:1, the actual amount of lithium source is the required 1.05 times the reaction volume);

[0034] 3) After stirring the above yellow suspension at 80°C for...

Embodiment 2

[0042] 1) 1.26g ferrous oxalate dihydrate (FeC 2 o 4 2H 2 O), 1.28g oxalic acid (C 2 h 2 o 4 2H 2 O) join in 20mL distilled water, form yellow suspension solution;

[0043] 2) 0.3084g lithium hydroxide monohydrate (LiOH·H 2 O) was dissolved in 10 mL of distilled water to form a clear solution; 0.3 g of sucrose (C 12 h 22 o 11 ) was dissolved in 10mL distilled water to form a clear solution; lithium hydroxide solution, 480μL phosphoric acid, and sucrose solution were added to the above yellow suspension (the molar ratio of lithium source to phosphorus source was 1.05:1, and the actual amount of lithium source was the required 1.05 times the reaction volume);

[0044] 3) After stirring the above yellow suspension at 90°C for 36h, the yellow suspension turned into a yellow solution; the yellow solution was stirred and dried to obtain a yellow sol; the solid obtained after drying the yellow sol at 120°C was placed in Ball milling for 6 hours to obtain reddish-brown prec...

Embodiment 3

[0048] 1) 1.26g ferrous oxalate dihydrate (FeC 2 o 4 2H 2 O), 5.12g oxalic acid (C 2 h 2 o 4 2H 2 O) join in 20mL distilled water, form yellow suspension solution;

[0049] 2) 0.75g lithium acetate (CH 3 COOLi·2H 2 O) was dissolved in 10 mL of distilled water to form a clear solution; 0.8051 g of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) was dissolved in 10mL distilled water to form a clear solution; 0.3g glucose (C 6 h 12 o 6 ·H 2 O) Dissolve in 10mL distilled water to form a clear solution; respectively add lithium acetate solution, ammonium dihydrogen phosphate solution, and glucose solution into the above-mentioned yellow suspension (the molar ratio of lithium source to phosphorus source is 1.05:1, the actual amount of lithium source 1.05 times the required reaction volume);

[0050] 3) After stirring the above yellow suspension at 95°C for 12 hours, the yellow suspension turned into a yellow solution; the yellow solution was stirred and dried to obtain...

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Abstract

The invention provides a lithium iron phosphate cathode material with carbon coating in situ and a preparation method thereof. A product is prepared by a liquid phase ball milling method, the particle surface of the product is coated with a uniform carbon layer, particles are connected to one another by an amorphous carbon net, and the grain size of the particles is 100 to 200 nanometers. The preparation method mainly comprises preparation of precursor powder and the preparation of the product. The lithium iron phosphate cathode material is synthesized by the liquid phase ball milling method, the particle grain size of the product is nano scale, the particles are uniformly distributed, and the lithium iron phosphate cathode material has the obvious advantages of high specific surface area, low charge mass transfer resistance and improvement on electron and ion conductivity. By carbon coating in situ, bulk conductivity among active substance particles and between an active substance and a conductive agent is improved, the impedance among the particles is reduced, the electrochemical performance is excellent, market promotion at a large scale is facilitated, and the lithium iron phosphate cathode material can serve as a positive material of a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and electrochemistry, in particular to an in-situ carbon-coated lithium iron phosphate (LiFePO 4 / C) positive electrode material and preparation method thereof. Background technique [0002] With the depletion of traditional fuels such as oil, the development of green new energy industries has become a priority for all countries. Among them, new energy vehicles have become the development direction of the global automobile industry. The urgent task at present is to determine the technical route and market promotion measures as soon as possible to promote the leapfrog development of the new energy automobile industry. As a supporting product of the new energy automobile industry, power batteries are scrambling to research related technologies and vigorously promote the industrialization process of power batteries. The power battery needs to have the characteristics of high capacity, high po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 葛曜闻皮玉强
Owner 曹余良
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