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Composite lithium manganese phosphate serving as lithium ion battery anode material and preparation method thereof and lithium ion battery

A technology for composite lithium manganese phosphate and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult commercial application, poor safety, high price, etc., and achieve the improvement of electrochemical discharge capacity and rate Discharge performance, excellent electrical conductivity, and the effect of improving electrical conductivity

Active Publication Date: 2011-10-05
博尔特新材料(银川)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobalt oxide has been hindered in the application of power lithium batteries due to the disadvantages of high price, shortage of resources, and poor safety.
Lithium manganese oxide is a lithium battery cathode material following the commercialization of lithium cobalt oxide. After years of research, the cycle performance of the material has been improved to a certain extent, but the high temperature cycle performance has not been resolved, which limits its use in power batteries, especially electric vehicle power supplies. Aspects of application
Ternary materials have shown great potential to replace lithium cobalt oxide in recent years, but this is only a compromise solution and cannot fundamentally solve the cost, toxicity and safety problems of lithium batteries
Lithium manganese phosphate [Chinese patent 201010161501] and [Chinese patent 200910111252] without carbon coating and metal doping can not be effectively improved, and it will be difficult to obtain commercial application

Method used

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  • Composite lithium manganese phosphate serving as lithium ion battery anode material and preparation method thereof and lithium ion battery
  • Composite lithium manganese phosphate serving as lithium ion battery anode material and preparation method thereof and lithium ion battery
  • Composite lithium manganese phosphate serving as lithium ion battery anode material and preparation method thereof and lithium ion battery

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preparation example Construction

[0026] Please see figure 1 , which is a preparation method of composite lithium manganese phosphate in a preferred embodiment, using the preparation method of composite lithium manganese phosphate to produce composite lithium manganese phosphate to be used as the positive electrode material of lithium ion battery, the preparation method of the composite lithium manganese phosphate includes Follow the steps below:

[0027] Step S300, Ti 3 SiC 2 Preparation: Mix Ti, Si and C powders according to the ratio of 3:1:2, and use ethanol, or pure water, or a mixture of ethanol and pure water as a dispersant in a ball mill for 2-20 hours, After the slurry is stirred and dried or spray-dried, it is forged and pressed to form a green body, which is roasted under the protection of an inert gas at a roasting temperature of 1000-1500 °C and a roasting time of 1-20 hours, naturally cooled to room temperature, and then crushed to particle size Standby for nanoscale or submicron scale. Amon...

Embodiment 1

[0036] Ti 3 SiC 2 Preparation: Mix Ti, Si and C powders according to the material ratio of 3:1:2, ball mill in the QM planetary ball mill of Nanjing University at a speed of 450r / min, and ethanol as the dispersion medium for 18h, and the slurry is granulated by LDZ pressure spray Drying machine spray drying, the dried material is forged into a green body by a flat vulcanizing machine, roasted at 1200°C for 10 hours under the protection of argon, naturally cooled to room temperature, and then crushed to nano or submicron by a jet mill for use. The prepared material is suitable for all examples.

[0037] Accurately weigh 155.91 grams of lithium dihydrogen phosphate, 367.64 grams of manganese acetate, 3.5 grams of magnesium acetate, 10.3 grams of iron oxide, 0.8 grams of niobium pentoxide, 1.1 grams of silver oxide, Ti 3 SiC 2 20 grams, added to 500ml ethanol while stirring, and then using a QM planetary ball mill to use agate balls as the ball milling medium for 24 hours at a...

Embodiment 2

[0040] Accurately weigh 1124.2 grams of lithium acetate, 1149.5 grams of manganese carbonate, 1150.3 grams of ammonium dihydrogen phosphate, 13.3 grams of magnesium oxide, 5.1 grams of aluminum oxide, 13 grams of copper oxide, 5 grams of cerium oxide, Ti 3 SiC 2 33 grams, was added to 10000ml pure water while stirring, and then used QM planetary ball mill to use zirconia balls as the ball milling medium at a speed of 600rpm for 2 hours; the prepared slurry was spray-dried at 350°C to obtain the precursor; The precursor was ball-milled at 50rpm for 10 hours with a roller ball mill, and then pressed into a green body with a flat vulcanizer; the green body was roasted at 550°C in a rotary furnace under the protection of argon for 20 hours, and then naturally cooled to room temperature; 150 ultrafine pulverizer to crush to the required particle size; mechanically vibrate the obtained material with a vibrator to obtain a composite lithium manganese phosphate material.

[0041] Aft...

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Abstract

The invention discloses composite lithium manganese phosphate serving as a lithium ion battery anode material. The composite lithium manganese phosphate serving as the lithium ion battery anode material comprises lithium manganese phosphate matrix, metal ions are doped into the lithium manganese phosphate matrix, the adding amount of the metal ions is 0.001 to 0.2 times stoichiometric ratio of the lithium manganese phosphate matrix, Ti3SiC2 is doped and coated outside the lithium manganese phosphate matrix, the coating amount of the Ti3SiC2 is 0.1 to 30 percent of the mass of the matrix, the specific surface area of the composite lithium manganese phosphate is 3 to 50 m<2> / g, and the tap density is 0.9 to 1.8 g / cm<3>. The invention also provides a preparation method of the composite lithium manganese phosphate and a lithium ion battery using the composite lithium manganese phosphate as the anode material.

Description

Technical field: [0001] The invention belongs to the field of new energy materials, and in particular relates to a composite lithium manganese phosphate used as a positive electrode material of a lithium ion battery, a preparation method thereof, and a lithium ion battery using the composite lithium manganese phosphate as a positive electrode material. Background technique: [0002] In 1991, Sony first realized the commercialization of lithium-ion secondary batteries. Lithium-ion batteries are widely used in small devices such as mobile communication equipment, portable computers, video cameras, cameras, MP3, etc., and also become reserve power sources for power generation systems such as solar energy and wind energy, power supplies for cordless power tools, hybrid electric vehicles (HEV), and pure electric vehicles. Automotive (EV) power supplies. [0003] Commercial lithium battery cathode materials mainly include LiCoO 2 , LiMn 2 o 4 , NiCoMn ternary materials and lit...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525H01M4/1397
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 侯春平杨丹马少宁
Owner 博尔特新材料(银川)有限公司
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