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Manganic niobium doping type lithium manganate cathode material for lithium-ion secondary battery and preparation method thereof

A secondary battery, type lithium manganese oxide technology, applied in the field of manganese-site niobium-doped lithium manganate cathode material and its preparation, can solve the problems of poor high-temperature cycle performance, low capacity, low voltage platform, etc., and achieve crystallization performance Good, wide application prospects, the effect of increasing capacity

Inactive Publication Date: 2009-09-23
济宁市无界科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobaltate is expensive due to lack of cobalt resources, and has poor thermal stability and safety problems; ternary materials are also expensive, with poor thermal stability and low voltage platform; lithium iron phosphate has poor conductivity and low density; traditional lithium manganate Although the cost is low and the safety is good, the capacity is low and the high temperature cycle performance is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh battery-grade lithium carbonate (Li 2 CO 3 )37.04g, electrolytic manganese dioxide (MnO 2 )177.4g, analytically pure niobium oxide (Nb 2 o 5 ) 6.6g after mixing, put into corundum ball mill jar, add 100ml of absolute ethanol, seal it, and mill it for 10 hours with zirconia balls as the ball milling medium on the roller ball mill, discharge the material, dry at 80°C, and put it into the muffler furnace Pre-calcined at 800°C for 15 hours, the obtained semi-finished product was ball-milled in a polyurethane ball mill tank for 3 hours by dry method, and then baked again at 680°C for 10 hours, and passed through a 300-mesh sieve after being released from the furnace to obtain the target product. Its first-time reversible specific capacity is measured to be 120.8mAh / g, and its capacity remains above 90% for 300 times of charge and discharge. The rate performance: 85% of its capacity is maintained for 300 times of discharge at 20C.

Embodiment 2

[0018] Weigh battery-grade lithium carbonate (Li 2 CO 3 )37.04g, electrolytic manganese dioxide (MnO 2 )177.4g, analytically pure niobium oxalate (C 10 h 5 NbO 20 ) 26.9g after mixing, put it into a corundum ball mill jar, add 100ml of absolute ethanol, seal it, and use zirconia balls as the ball milling medium for 10 hours on a drum-type ball mill, discharge, dry at 80°C, and pre- Roasting for 15 hours, the obtained semi-finished product is ball milled in a polyurethane ball mill tank for 3 hours by dry method, then secondarily roasted at 680° C. for 10 hours, and passed through a 300-mesh sieve after being released from the furnace to obtain the target product. Its first-time reversible specific capacity is measured to be 123.2mAh / g, and its capacity remains above 90% for 300 times of charge and discharge. The rate performance: 85% of its capacity is maintained for 300 times of discharge at 20C.

Embodiment 3

[0020] Weigh battery-grade lithium carbonate (Li 2 CO 3 )37.04g, chemical manganese dioxide (MnO 2 )177.4g, analytically pure niobium oxide (Nb 2 o 5 ) 6.6g was mixed and added to the corundum mill jar, and then 100ml of absolute ethanol was added, and after sealing, the zirconia ball was used as the ball milling medium on the drum ball mill for 10 hours, and the material was discharged, dried at 80°C, and preheated at 800°C. Roasting for 15 hours, the obtained semi-finished product is ball milled in a polyurethane ball mill tank for 3 hours by dry method, then secondarily roasted at 680° C. for 10 hours, and passed through a 300-mesh sieve after being released from the furnace to obtain the target product. Its first-time reversible specific capacity is measured to be 125.8mAh / g, and its capacity remains above 92% for 300 times of charge and discharge. The rate performance: 86% of its capacity is maintained for 300 times of discharge at 20C.

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Abstract

The invention relates to a manganic niobium doping type lithium manganate cathode material for a lithium-ion secondary battery and a preparation method thereof. The invention adopts a solid-phase method which is easy for industrialization and prepares cathode material lithium manganate powder for the manganic niobium doping type lithium-ion secondary battery with good crystallization performance and uniform ingredients through a simple ball milling and sintering process by controlling the ball milling time and the sintering temperature and time. The chemical general formula of the lithium battery cathode material is LiMn<2-x>NbxO4, wherein, x is larger than 0 but smaller than 0.2. Compared with common lithium manganate, the lithium battery cathode material has the characteristics of higher capacity, better circulation and more superior magnification performance and is easier for industrialized production.

Description

Technical field: [0001] The invention relates to a manganese-site niobium-doped lithium manganate cathode material for a lithium-ion secondary battery and a preparation method thereof. Background technique: [0002] Traditional secondary batteries mainly include lead-acid batteries, cadmium-nickel batteries, nickel-metal hydride batteries, etc., which cannot meet the market demand well due to problems such as low energy density and environmental pollution. According to the needs of social development, its application scope will become wider and wider. [0003] The cathode material is an important part of lithium-ion batteries, accounting for 40% of the cost of lithium-ion batteries, and is also the key to determining the performance of lithium-ion batteries. At present, the practically used cathode material is mainly lithium cobalt oxide (LiCoO 2 ), ternary materials (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ), lithium iron phosphate (LiFePO 4 ) and lithium manganate (LiMn 2 o 4 ...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01G45/00H01M4/04
CPCY02E60/12Y02E60/10
Inventor 胡晓宏贺兆书
Owner 济宁市无界科技有限公司
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