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Lithium manganese phosphate cathode material and preparation method thereof

A technology of lithium manganese phosphate and cathode material, which is applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of unstable crystal structure, affecting the cycle performance of materials, and general electrochemical performance of lithium manganese phosphate materials. Improve discharge capacity and cycle performance, facilitate infiltration and storage, de-intercalation and convenient transfer

Active Publication Date: 2013-02-13
宁波富理电池材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported in the literature that carbon-coated lithium manganese phosphate materials can be prepared by the method of precursor spray cracking and subsequent high-temperature calcination (Advanced Powder Technology, 2010, 21: 187~196), the conductive carbon coated on the surface of lithium manganese phosphate particles The network layer improves the electrochemical performance of the material to a certain extent, but the electrochemical performance of the lithium manganese phosphate material prepared by this method is average, and the room temperature discharge capacity at 0.05C is only 70mAh / g, and its preparation method is complicated, which cannot meet the actual requirements. Production needs
The prior art also discloses the technology of lowering the calcination temperature to prepare smaller lithium manganese phosphate particles (Journal of PowerSources, 2007, 174: 949~953), although reducing the particle size of the material improves the electrochemical performance of the material to a certain extent. performance, but at the same time it will affect the growth of the crystal form of the material, resulting in an unstable crystal structure of the material and impurities, which will affect the cycle performance of the material and cannot meet the actual production needs

Method used

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  • Lithium manganese phosphate cathode material and preparation method thereof
  • Lithium manganese phosphate cathode material and preparation method thereof
  • Lithium manganese phosphate cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 115.3g of 85wt% phosphoric acid, 93.1g of manganese carbonate, 15.17g of iron oxide, 46.16g of lithium hydroxide, 80.92g of sucrose and 2.7g of cetyltrimethylammonium bromide were mixed and dispersed in 824.4g of deionized water, Obtain a suspension with a solid content of 30wt%; then add the obtained suspension into the reaction kettle, heat it to 150°C for 15 hours under airtight conditions, and after the reaction is completed and cooled to room temperature, the reaction product is washed, filtered, and dried , to obtain the lithium manganese phosphate precursor powder; then the obtained lithium manganese phosphate precursor powder was calcined at a high temperature for 8 hours under the protection of nitrogen, the roasting temperature was 500 ° C, and then cooled to room temperature to obtain a lithium manganese phosphate positive electrode with a hollow spherical structure material whose molecular formula is LiMn 0.81 Fe 0.19 PO 4 / C.

[0062] The components and ...

Embodiment 2

[0072] 138.66g of diammonium hydrogen phosphate, 220.58g of manganese acetate, 7.9g of titanium dioxide, 38.79g of lithium carbonate, 40.6g of sucrose and 20.3g of triton were mixed and dispersed in 700g of deionized water to obtain a suspension with a solid content of 40%; Then add the obtained suspension into the reaction kettle, heat to 200° C. for 10 h under airtight conditions, and after the reaction is completed and cooled to room temperature, the reaction product is washed, filtered, and dried to obtain lithium manganese phosphate precursor powder; Then the obtained lithium manganese phosphate precursor powder was calcined at a high temperature for 5 hours under the protection of a nitrogen atmosphere at a temperature of 600°C, and then cooled to room temperature to obtain a lithium manganese phosphate positive electrode material with a hollow spherical structure, whose molecular formula is LiMn 0.9 Ti 0.1 PO 4 / C.

[0073] According to the detection method of Example...

Embodiment 3

[0076] Mix 126.53g of diammonium hydrogen phosphate, 86.07g of manganese dioxide, 0.4g of magnesium oxide, 65.99g of lithium acetate, 55.80g of polyvinyl alcohol and 27.8g of citric acid, and disperse them in 1160g of deionized water to obtain a suspension with a solid content of 20%. Then add the obtained suspension into the reaction kettle, heat it to 250°C under airtight conditions and react for 5h, after the reaction is completed and cooled to room temperature, the reaction product is washed, filtered, and dried to obtain the lithium manganese phosphate precursor powder body; then the obtained lithium manganese phosphate precursor powder is roasted at high temperature for 2 hours under the protection of nitrogen atmosphere, the roasting temperature is 700 ° C, and then cooled to room temperature to obtain a lithium manganese phosphate positive electrode material with a hollow spherical structure, and its molecular formula is LiMn 0.99 Mg 0.01 PO 4 / C.

[0077] According ...

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Abstract

The invention provides a lithium manganese phosphate cathode material which comprises carbon and lithium manganese phosphate with a molecular formula (I): LiMn1-xMxPO4 (I), wherein x is greater than or equal to 0 and less than or equal to 0.2, and M is selected from any one of Ti, Co, Fe, Mg, Al, Cr and Nb. The lithium manganese phosphate cathode material disclosed by the invention is of a hollow ball structure, and the hollow ball structure is made of sheet-like primary particles. In the lithium manganese phosphate cathode material, the diffusion path of lithium ions in lithium manganese phosphate particles is shortened by the sheet-like oriented growth of the primary particles, so that the diffusion velocity is increased. The hollow ball structure is more beneficial to immersion and storage of electrolyte and an electrode material, so that deintercalation and transmission processes of the lithium ions are more convenient and faster, and the discharging capacity and the cycling performance of the lithium manganese phosphate material are enhanced.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a lithium manganese phosphate cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in civilian and military fields due to their advantages such as high working voltage, large specific energy, small self-discharge and less environmental pollution. Among them, the development of cathode material technology is a key factor in the progress of lithium-ion battery technology. [0003] Among the existing positive electrode materials, polyanionic phosphate materials have attracted much attention due to their advantages such as stable structure, excellent safety performance, and long cycle life. At present, lithium iron phosphate (LiFePO4) is widely used. 4 ) materials, however, the 3.4V voltage platform of lithium iron phosphate severely limits the improvement of battery energy density, thereby limit...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 刘兆平夏永高陈立鹏
Owner 宁波富理电池材料科技有限公司
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