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Cathode material for high voltage lithium battery

A cathode material, lithium battery technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of low initial discharge capacity, poor cycle stability, low reaction yield, etc., to achieve good electrochemical performance, cycle The effect of improved performance and simple synthesis method

Inactive Publication Date: 2011-11-30
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the materials synthesized by these methods have problems such as low initial discharge capacity, poor cycle stability, low reaction yield, and inconvenient operation.

Method used

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  • Cathode material for high voltage lithium battery
  • Cathode material for high voltage lithium battery
  • Cathode material for high voltage lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 4.5 mol of manganese sulfate, 1.38 mol of nickel sulfate, and 0.12 mol of copper sulfate were prepared into 3000 ml of soluble salt mixed solution, and 12.0 mol of sodium hydroxide and 280 ml of ammonia water were prepared into 3000 ml of mixed solvent. Add the above-mentioned soluble salt mixed solution and mixed solvent into a 10L reactor at the same speed of 3.0ml / min, control the reaction temperature to 50℃, pH value 9.0, and keep stirring until the reaction is over, and then stir after the reaction is over After 0.5 hours, the obtained black precipitate was separated, filtered, and dried to obtain a precursor. Mix 200g of the precursor with lithium hydroxide at a molar ratio of Li:(Mn+Ni+Cu) of 0.5, add anhydrous ethanol to mix, and dry; dry the dried product at 500℃ for 2 hours and then cool and grind Then, it was calcined at 950°C for 7 hours, cooled and ground, and passed through a 200-mesh sieve to obtain a black high-voltage lithium ion battery cathode material...

Embodiment 2

[0046] 3.0 mol of manganese chloride, 0.92 mol of nickel chloride, and 0.08 mol of magnesium chloride were prepared into 3000 ml of soluble salt mixed solution, and 8.0 mol of sodium hydroxide and 300 ml of ammonia water were prepared into 3000 ml of mixed solvent. Add the above-mentioned soluble salt mixed solution and mixed solvent at the same speed of 5.0ml / min into a 10L reactor, control the reaction temperature to 55℃, pH value 10.0, and keep stirring until the reaction is over, the black precipitate obtained Separate, wash with deionized water 3 times, filter and dry to obtain the precursor. Mix 200g of the precursor with lithium carbonate at a molar ratio of Li:(Mn+Ni+Mg) of 0.51, add deionized water, mix, and dry; dry the dried product at a constant temperature of 500°C for 2 hours and then cool and grind it. Then it was calcined at 850° C. for 10 hours, cooled and ground, and passed through a 200-mesh sieve to obtain a black high-voltage lithium ion battery cathode mat...

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Abstract

The present invention advantageously provides a high-voltage lithium battery cathode material and its general formula for the composition of the high-voltage lithium battery cathode material presented in this invention: €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒLiMn 1.5 Ni 0 . 5-X M X O 4 Of which: 0 <X ‰¤ 0.2, M represents one or several elements comprised by copper, zinc, magnesium, aluminum, cadmium, zirconium, and titanium. The present invention relates to a high-voltage lithium battery cathode material, which utilizes the liquid-phase co-precipitation method to dope transition metal elements, so that all elements could be mixed at the atomic level and obtain a relatively uniform product, stabilizing the crystal structure, avoiding the capacity attenuation caused by structure collapse in the material cyclic process; in addition, this invention has also increased the conductivity, improved the capacity of 5V platform, thereby avoiding the substantial damage to the battery system resulted from the decomposition of the electrolyte. Thus, a newly high-voltage lithium battery cathode material featured with good electrochemical properties and cycle performance has been proposed in the present invention; moreover, the utilization of liquid-phase co-precipitation has the advantages of simple synthesis method, convenient operation process, easier to control, high yield coefficient, low energy consumption, and easy-to-industrial production.

Description

Technical field [0001] The invention relates to a lithium ion battery material, in particular to a high-voltage lithium battery cathode material. Background technique [0002] The current used ionic battery cathode materials such as LiCoO 2 , LiMn 2 O 4 And the voltage of the new nickel-cobalt-manganese ternary material is about 4V, which limits the power of the battery, and the cobalt-based cathode material is expensive due to the scarcity of cobalt resources and cannot be widely used in large power tools. Although lithium manganate is rich in resources, relatively cheap, and safe and non-polluting, the problems of poor high-temperature cycle stability and serious capacity attenuation have not been well resolved, making it problematic for commercial production. [0003] LiMn 2 O 4 In the modification study, it was found that LiMn substituted by transition metal 2-X M X O 4 (M=Cr, Co, Ni, Cu, Fe, Mo, V) performance is significantly better than LiMn 2 O 4 And with the increase of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/1391
CPCY02E60/122C01P2002/72C01P2002/52H01M4/485H01M10/052C01G53/54C01G45/1242H01M4/505Y02E60/12H01M4/525C01P2006/40C01P2004/03Y02E60/10
Inventor 吴宁宁滕国鹏宋文娥陈渊王雅和葛焕增
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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