Lithium iron phosphate/titanium diboride composite cathode material for lithium ion battery and preparation method of lithium iron phosphate/titanium diboride composite cathode material

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced material volume energy density, poor processing performance, aggravated low density of lithium iron phosphate materials, etc., and achieves good high magnification Performance, high tap density effect

Inactive Publication Date: 2012-08-01
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low tap density of graphite / carbon composite material exacerbates the defect of low density of lithium iron phosphate material, which reduces the volume energy density of the material and poor processability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take by weighing 37.7 grams of lithium carbonate, 150.8 grams of ferric phosphate, 2 grams of titanium dioxide, 1.4 grams of boron carbide and 3.9 grams of carbon powder, and fully mix them on a ball mill for 3 hours; place the above mixture in a tube furnace, and heat up under nitrogen protection to 800°C, keep it warm for 10 hours, take it out after cooling; ball mill the above-mentioned substances under the protection of nitrogen, and crush them to D 50 It is 1.326um. The titanium diboride content of this material is 0.7%, and the tap density is 1.62g / cm 3 , Do button battery test, 1C specific capacity is 155.2mAh / g, 10C specific capacity is 121.0mAh / g.

Embodiment 2

[0021] Weigh 780.2g of lithium carbonate, 3000g of iron phosphate, 113.6 grams of titanium dioxide, 39.8 grams of boron carbide, and 68.9 grams of carbon powder, and fully mix them on a ball mill for 3 hours; Into nitrogen, at 50m 3 Under the flow of nitrogen gas per hour, heat up to 650°C for 10 hours, take it out after cooling; ball mill the above-mentioned substances under the protection of nitrogen gas, and crush them to D 50 It is 1.326um. The titanium diboride content of this material is 3.5%, and the tap density is 1.72g / cm 3 , do button battery test, 0.1C specific capacity is 160.2mAh / g, 1C is 150.1mAh / g, effective battery test, 400 cycle cycle capacity retention rate is 86.87%

Embodiment 3

[0023] Weigh 275.1g of lithium carbonate, 1000g of iron phosphate, 64.9 grams of titanium dioxide, 22.8 grams of boron carbide, and 41.5 grams of carbon powder, and fully mix them on a ball mill for 1 hour; Into nitrogen, at 20m 3 Under the nitrogen flow rate of / h, heat up to 850°C and keep it warm for 15 hours, take it out after cooling; ball mill the above materials, and crush them to D 50 It is 1.673um. The titanium diboride content of this material is 6.1%, and the tap density is 1.78g / cm 3 , do button battery test, 0.1C specific capacity is 157.5mAh / g, 1C is 150.6mAh / g, actual battery test, 400 cycle cycle capacity retention rate is 86.46%

[0024] It can be seen from the test results that the lithium iron phosphate / titanium diboride composite positive electrode material prepared by the method of the present invention has a significantly higher tap density than traditional materials while maintaining good electrochemical performance, which greatly improves the performa...

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Abstract

The invention discloses a preparation method for a lithium iron phosphate / titanium diboride composite cathode material for a lithium ion battery. The preparation method comprises the following steps of: (1) sufficiently and uniformly mixing lithium carbonate, iron phosphate, a titanium source, boron carbide and carbon powder according to a molar ratio of (0.51-0.60): 1.0: (0.005-0.05): (0.025-0.25): (0.075-0.10); (2) roasting the obtained mixture for 10-16 hours at 650-900 DEG C under the protection of nitrogen; and (3) cooling an obtained product after roasting, and then ball-milling and smashing the product to an appointed granularity. The composite cathode material prepared by the preparation method has the advantages of high tap density, good processability and good cycle performance.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery, in particular to a lithium iron phosphate composite positive electrode material and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have been widely used as power sources for mobile communication equipment, computers, cameras, etc.; large-capacity and high-power power lithium-ion batteries have become ideal power sources for environmentally friendly electric vehicles. As a new type of lithium-ion battery cathode material, lithium iron phosphate has a high theoretical specific capacity and voltage platform, and has good cycle performance, low price, and good safety. It is considered to be a lithium-ion power battery with great application potential. Cathode material. However, the conductivity of lithium iron phosphate is low, and the theoretical capacity cannot be exerted. Therefore, graphite / carbon is usually used as a condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 刘勇程晓焜徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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