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Lithium hexafluorozirconate and carbon co-coated lithium iron phosphate composite material, and preparation method and application thereof

A technology of carbon co-coating lithium iron phosphate and lithium hexafluorozirconate, which is applied to electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as poor electrochemical performance, low first-cycle capacity, and poor low-temperature performance , to achieve the effect of increasing compaction density, reducing loss and increasing the capacity of the first circle

Active Publication Date: 2019-12-27
BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this coating method only solves the problem of poor electrochemical performance of the material itself, but does not effectively solve the problems of low first efficiency, poor low temperature performance, and low first cycle capacity in the charging and discharging process of the battery.

Method used

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  • Lithium hexafluorozirconate and carbon co-coated lithium iron phosphate composite material, and preparation method and application thereof
  • Lithium hexafluorozirconate and carbon co-coated lithium iron phosphate composite material, and preparation method and application thereof
  • Lithium hexafluorozirconate and carbon co-coated lithium iron phosphate composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Lithium carbonate, anhydrous ferric phosphate, glucose and lithium hexafluorozirconate are put into the grinding tank in sequence according to the molar ratio Li:Fe:C:Zr=1.05:1:1:0.001, and deionized water is added to the slurry The solid content of the material is 25%, and the precursor slurry is fully ground to a particle size of 100nm to realize activation.

[0075]The resulting slurry was spray-dried in a spray dryer, and the inlet temperature and outlet temperature were set to 310°C and 120°C respectively; 4 fluid nozzles were used for spraying, flow meters were installed on the two inlet pipes, and flow meters were installed on the two inlet pipes. A peristaltic pump is installed on the pipe and fed from the same bucket of slurry. The intake volume of one of the intake pipes is 30NL / min, and the feed volume of the corresponding feed pipe is 5ml / min, which is used to prepare small particle size particles; the intake volume of the other intake pipe is 90NL / min; The...

Embodiment 2

[0080] Lithium hydroxide, ferric phosphate dihydrate, polyvinyl alcohol and lithium hexafluorozirconate are put into the grinding tank in sequence according to the molar ratio of Li:Fe:C:Zr=1.01:1:1.4:0.1, and pure water is added to The solid content of the slurry is 15%, and the precursor slurry is fully ground to a particle size of 300nm to realize activation.

[0081] The resulting slurry was spray-dried in a spray dryer, and the inlet temperature and outlet temperature were set to 280°C and 120°C respectively; 8 fluid nozzles were used for spraying, flow meters were installed on 4 inlet pipes, and flow meters were installed on 4 inlet pipes. A peristaltic pump is installed on the pipe and fed from the same bucket of slurry. The intake volume of one of the intake pipes is 10NL / min, and the feed volume of the corresponding feed pipe is 5ml / min, which is used to prepare small particle size particles; the intake volume of the other three intake pipes is 60NL / min. min; the fee...

Embodiment 3

[0084] Lithium acetate, ammonium ferric phosphate dihydrate, phytic acid and lithium hexafluorozirconate are put into the grinding tank in sequence according to the molar ratio of Li:Fe:C:Zr=1.03:1:1.4:0.005, and pure water is added to The solid content of the slurry is 40%, and the precursor slurry is fully ground to a particle size of 400 nm.

[0085] The resulting slurry was spray-dried in a spray dryer, and the inlet temperature and outlet temperature were set to 300°C and 120°C respectively; 6 fluid nozzles were used for spraying, flow meters were installed on 3 inlet pipes, and flowmeters were installed on 3 inlet pipes. A peristaltic pump is installed on the pipe and fed from the same bucket of slurry. The intake volume of one of the intake pipes is 10NL / min, and the feed volume of the corresponding feed pipe is 2ml / min, which is used to prepare small particle size particles; the intake volume of the other two intake pipes is 70NL / min. min; the feeding volume of the co...

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Abstract

The invention discloses a lithium hexafluorozirconate and carbon co-coated lithium iron phosphate composite material, and a preparation method and an application thereof. The composite material comprises a lithium iron phosphate inner core and a coating layer coating a surface of the inner core, wherein the coating layer is composed of lithium hexafluorozirconate and pyrolytic carbon, and the composite material comprises at least two composite material particles with different particle size ranges. The method comprises steps of 1) pulping a lithium source, a phosphorus iron source, a carbon source and lithium hexafluorozirconate, grinding and activating; 2) manufacturing spheres with at least two particle size ranges by using a spray dryer; and (3) sintering to obtain the lithium hexafluorozirconate and carbon co-coated lithium iron phosphate composite material. The method is advantaged in that compaction density of the material can be obviously improved, and a total battery prepared by taking the composite material as a positive electrode active substance has excellent first-circle capacity, cycle performance and low-temperature performance.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, and relates to a lithium hexafluorozirconate and carbon co-coated lithium iron phosphate composite material, its preparation method and application, and in particular to a hexafluorozirconate with high compaction density and good electrochemical performance. Lithium fluorozirconate and carbon co-coated lithium iron phosphate composite material, its preparation method and use as lithium ion cathode material. Background technique [0002] As a commercialized positive electrode material, lithium iron phosphate material has always had the problems of low electronic conductivity and low ion migration rate. The lithium iron phosphate power battery has always needed further optimization due to its low actual energy density. [0003] At present, carbon coating has become the main means to improve the electrochemical performance of lithium iron phosphate cathode mater...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/0525
CPCH01M4/366H01M4/5825H01M4/62H01M4/136H01M10/0525Y02E60/10
Inventor 杨帆王张健杨顺毅吴小珍杨才德
Owner BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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