Synergistically modified cobalt lithium fluorophosphate cathode material and preparation method thereof

A lithium cobalt fluorophosphate, cathode material technology, applied in nanotechnology for materials and surface science, battery electrodes, electrical components, etc., can solve problems such as low conductivity and poor cycle performance, achieve high energy density, improve Electronic conductivity, effect of protecting structural stability

Active Publication Date: 2018-03-27
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the positive electrode material such as low electronic and ionic conductivity and poor cycle per

Method used

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  • Synergistically modified cobalt lithium fluorophosphate cathode material and preparation method thereof
  • Synergistically modified cobalt lithium fluorophosphate cathode material and preparation method thereof
  • Synergistically modified cobalt lithium fluorophosphate cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0033] Example 1

[0034] (1) Put LiOH . H 2 O, Co(CH 3 COO) 2 . 4H 2 O, Ni(CH 3 COO) 2 . 4H 2 O, LiF according to the ratio of the amount of Li: Co: Ni: F substance is 2.02: 0.93: 0.07:1 in deionized water, stir evenly, add H 3 PO 4 , LiF press PO 4 3- : The ratio of the amount of F substance is 1:1 H 3 PO 4 Drop into the above solution, continue to stir for 8 min, transfer it to the autoclave, hydrothermally heat at 200°C for 11 h, cool to room temperature naturally, take it out, and dry to obtain the precursor;

[0035] (2) After mixing the above-mentioned nickel-doped precursor and carbon in Ketjen Black / ascorbic acid at a mass ratio of 95:5, dry milling, tableting, pre-burning at 350°C for 6h in an argon atmosphere, followed by furnace Cool down, take out, grind, press tablets, calcine at 650℃ for 5 h, get Li 2 Co 0.93 Ni 0.07 PO 4 F / C material;

[0036] (3) Weigh 0.5 g of silica powder into a beaker, add ionized water, ultrasonicate for 30 minutes, and then add 1.0 g of the abo...

Example Embodiment

[0037] Example 2

[0038] (1) Put LiOH . H 2 O, Co(NO 3 ) 2 . 6H 2 O, Ni(NO 3 ) 2 . 6H 2 O, LiF according to the ratio of the amount of Li: Co: Ni: F substance is 2.02:0.93:0.07:1 in deionized water, stir evenly, add NH 4 H 2 PO 4 , LiF press PO 4 3- : The ratio of the amount of F substance is 1:1 NH 4 H 2 PO 4 Add to the above solution, continue to stir for 15 min, transfer it to the autoclave, hydrothermally at 180°C for 15 h, cool to room temperature naturally, take it out, and dry to obtain the precursor;

[0039] (2) After mixing the above-mentioned nickel-doped precursor and the carbon in glucose / sucrose at a mass ratio of 90:10, add an appropriate amount of ethanol, wet mill, dry at 60°C, grind, and press, under argon atmosphere, Pre-fired at 400°C for 4 hours, put the sample into water for quenching, grinding, tableting, and calcining at 700°C for 4 hours to obtain Li 2 Co 0.93 Ni 0.07 PO 4 F / C material;

[0040] (3) Weigh 1.0 g of pH=8.5 nano-silica dispersion (30.2%) into a...

Example Embodiment

[0041] Example 3

[0042] (1) Put LiCH 3 COO . 2H 2 O, CoSO 4 . 7H 2 O, NiSO 4 . 6H 2 O, HF according to the ratio of the amount of Li: Co: Ni: F substance is 2.02: 0.93: 0.07:1 in deionized water, stir evenly, add NH 4 H 2 PO 4 , LiF press PO 4 3- : The ratio of the amount of F substance is 1:1 NH 4 H 2 PO 4 Add to the above solution, continue to stir for 20 min, transfer it to the autoclave, hydrothermally at 120°C for 20 h, cool to room temperature naturally, take it out, and dry to obtain the precursor;

[0043] (2) After mixing the above-mentioned nickel-doped precursor and the carbon in carbon nanofibers / pyrrole at a mass ratio of 85:15, dry grinding, tableting, pre-sintering at 300°C for 7 h in an argon atmosphere, continuous Calcined at 600℃ for 5 h to obtain Li 2 Co 0.93 Ni 0.07 PO 4 F / C material;

[0044] (3) Weigh 1.0 g of silica particles in a beaker, add ionized water, ultrasound for 90 min, and then add 1.0 g of the above Li 2 Co 0.93 Ni 0.07 PO 4 F / C material, magnetic...

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Abstract

The invention relates to a nickel-doped and carbon/silica-coated synergistically modified cobalt lithium fluorophosphates cathode material and a preparation method thereof. The preparation method comprises the following steps: (1) respectively adding a lithium source, a cobalt source, a fluorine source and a nickel source compound into deionized water in a certain stoichiometric ratio, stirring, adding a certain amount of a phosphate source compound into the solution, further stirring, transferring into a high pressure reaction kettle, airtightly heating, reacting, then naturally cooling, taking out, and drying, so that a precursor is obtained; (2) mixing the obtained precursor and a carbon source compound, grinding, and calcining for two stages in inert atmosphere, so that a carbon-coatednickel-doped Li2Co1-xNixPO4F/C material is obtained; and (3) weighing a certain amount of silica, putting into a breaker, adding deionized water, carrying out ultrasonic treatment, then adding the Li2Co1-xNixPO4F/C material, stirring, drying, and grinding, so that the Li2Co1-xNixPO4F/C+SiO2 target material is obtained. The prepared material is uniform in particles and good in crystallinity and has relatively high specific capacity and good cycle performance; and meanwhile, the synthetic process is simple and easy, and the production cost is low.

Description

technical field [0001] The invention relates to a positive electrode material and its preparation, in particular to a cobalt lithium fluorophosphate positive electrode material synergistically modified by nickel doping and carbon / silicon dioxide coating and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] In recent years, the emerging composite polyanionic lithium cobalt fluorophosphate (Li 2 CoPO 4 F) The material has a strong electronegativity F - PO with ions and strong inductive effects 4 3- ions, while exhibiting a high redox potential (4.9 V vs. Li + / Li) and good structural stability, since the material contains two Li + , its theoretical capacity is as high as 287 mAh g -1 , the energy density can reach 1435 Wh kg -1 , is expected to become a hot spot for future development. However, poor ionic and electronic conductivity and cycle performance are the key factors hindering the wide applicat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 常彩云冯季军姜鑫宇
Owner UNIV OF JINAN
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