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High density spherical nano lithium iron phosphate material, a preparation method thereof, and lithium ion battery containing same

A lithium iron phosphate, high-density technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of material capacity, low temperature, rate performance and processing, cycle performance can not be well balanced, etc., to achieve compaction density High, good slurry fluidity, taking into account the effect of capacity

Active Publication Date: 2016-12-14
江苏贝特瑞纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently, LiFePO 4 Material capacity, low temperature, rate performance, processing and cycle performance cannot be well balanced

Method used

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  • High density spherical nano lithium iron phosphate material, a preparation method thereof, and lithium ion battery containing same
  • High density spherical nano lithium iron phosphate material, a preparation method thereof, and lithium ion battery containing same
  • High density spherical nano lithium iron phosphate material, a preparation method thereof, and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Lithium hydroxide monohydrate, ferric orthophosphate, magnesium oxide and sucrose, with a molar ratio of Li:Fe:P:M=1.02:1:1.02:0.02, and a carbon content of 1%, are added to the three-dimensional mixer , mixed for 6h;

[0057] (2) Put the mixed material in N 2 Pre-burn at 450°C for 10 hours in a protected box-type furnace;

[0058] (3) The calcined material is mixed with polyethylene glycol and deionized water, and ultrafinely ground for 6 hours to obtain a slurry with a suitable particle size, wherein the quality of polyethylene glycol is 0.2% of the calcined material, and 0.2% of the deionized water The quality is 4 times that of pre-fired material;

[0059] (4) The obtained slurry is subjected to two-fluid spray drying, the inlet temperature of the spray dryer is 260° C., and the outlet temperature is 80° C. to obtain a spherical nano-lithium iron phosphate precursor with a secondary particle size of 4 μm;

[0060] (5) Place the above-mentioned spherical nano-...

Embodiment 2

[0064] (1) Add lithium carbonate, ferric orthophosphate, manganese oxide and glucose, with a molar ratio of Li:Fe:P:M=1.05:1:1.02:0.005, and a carbon content of 1.5%, into a VC mixer and mix for 10 hours ;

[0065] (2) Put the mixed material in N 2 Pre-fired at 550°C for 4 hours in a protected roller kiln;

[0066] (3) Mix the calcined material with glucose and deionized water, and ultrafinely grind it for 10 hours to obtain a slurry with a suitable particle size, wherein the quality of glucose is 0.2% of the calcined material, and the quality of the deionized water is 0.2% of the calcined material. 4 times;

[0067] (4) The obtained slurry is subjected to four-fluid spray drying, the inlet temperature of the spray dryer is 200° C., and the outlet temperature is 60° C. to obtain a spherical nano-lithium iron phosphate precursor with a secondary particle size of 8 μm;

[0068] (5) Place the above-mentioned spherical nano-lithium iron phosphate precursor in a rotary furnace, ...

Embodiment 3

[0071] (1) Lithium hydroxide monohydrate, ferric phosphate dihydrate, niobium oxalate and citric acid are added to the dry method with a molar ratio of Li:Fe:P:M=1:1:1.05:0.02 and a carbon content of 0.5%. In a ball mill, mix for 6 hours;

[0072] (2) Put the mixed material in N 2 Pre-fired at 350°C for 8 hours in a protected roller kiln;

[0073] (3) Mix the calcined material with sucrose and deionized water, and ultrafinely grind it for 2 hours to obtain a slurry with a suitable particle size, wherein the quality of glucose is 2% of the calcined material, and the quality of deionized water is 2% of the calcined material. 1 times;

[0074] (4) The obtained slurry is subjected to four-fluid spray drying, the inlet temperature of the spray dryer is 350° C., and the outlet temperature is 120° C. to obtain a spherical nano-lithium iron phosphate precursor with a secondary particle size of 10 μm;

[0075] (5) Place the above-mentioned spherical nano-lithium iron phosphate precu...

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Abstract

A high density spherical nano lithium iron phosphate material, a preparation method thereof, and a lithium ion battery containing the same are provided. The preparation method comprises the following steps: (1) pre-sintering a lithium resource, iron phosphides, adulterant, and a carbon source with protective gas after dry mixing; (2) mixing a pre-sintering material, dispersant, and deionized water, and performing ultra fine grinding; (3) performing spray drying on a sizing agent obtained by ultra fine grinding, to obtain a spherical nano lithium iron phosphate precursor; and (4) performing chemical vapor deposition coating on the spherical nano lithium iron phosphate precursor obtained in step (3), to prepare the high density spherical nano lithium iron phosphate material. A primary particle size of the lithium iron phosphate material prepared in the present invention is not large, and a powder conductivity may reach 10.1 S / cm, so that a material capacity, low temperature, rate performance, and fabrication and cycling performance may be well balanced.

Description

technical field [0001] The invention belongs to the field of positive electrode materials of lithium ion batteries. Specifically, the invention relates to a high-density spherical nano-lithium iron phosphate material, a preparation method and a lithium ion battery containing the material. Background technique [0002] Olivine LiFePO 4 As a cathode material for lithium-ion batteries, it has the advantages of high theoretical capacity (170mAh / g), good cycle performance, stable structure, environmental friendliness, and abundant resources, and is widely favored; however, because LiFePO4 itself has low electronic conductivity and Li-ion diffusion rate, which greatly limits the LiFePO 4 electrochemical performance, and hindered the LiFePO 4 Cathode materials are widely used in power, start-stop power supply. [0003] After the LiFePO 4 After a lot of research, it was found that controlling the particle size and morphology, surface coating and metal ion doping can effectively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5805H01M10/0525Y02E60/10
Inventor 王张健杨顺毅任建国黄友元
Owner 江苏贝特瑞纳米科技有限公司
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