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Vanadium lithium phosphate cathode material and preparation method thereof

A technology of lithium vanadium phosphate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems that cannot meet the requirements of extremely high power use, does not have the feasibility of large-scale production, and has poor safety. Guarantee the normal consumption of electrolyte, improve the effect of high-power charging and discharging, and high consistency

Active Publication Date: 2019-08-02
骆驼集团武汉光谷研发中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the material prepared by this invention has relatively good structural stability and rate performance, it still cannot meet the requirements of extremely high power, extremely low temperature and extremely high temperature, and organic solvents are used in the hydrothermal preparation process, which is expensive and expensive. Poor safety, not feasible for large-scale production

Method used

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  • Vanadium lithium phosphate cathode material and preparation method thereof
  • Vanadium lithium phosphate cathode material and preparation method thereof
  • Vanadium lithium phosphate cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A lithium vanadium phosphate positive electrode material, the preparation method is as follows, first weigh 345.9 grams of 85% phosphoric acid, 222.3 grams of ammonium metavanadate, 5.3 grams of iron oxide, 126 grams of lithium hydroxide, and 35 grams of sucrose and 20g sodium dodecylbenzenesulfonate, the above raw materials are dispersed in 1760g of deionized water to form a suspension with a solid content of 30%; then the above suspension is added to the reactor and heated to 200 React at ℃ for 15 hours, after the reaction is completed and cooled to room temperature, wash, filter and dry to obtain the precursor powder of lithium vanadium phosphate; then weigh 9 grams of ammonium metavanadate and 450 grams of lithium vanadium phosphate precursor powder, and carry out the process in a high-speed disperser Mix well, then roast the above-mentioned raw materials at high temperature for 8 hours under the protection of nitrogen atmosphere, the roasting temperatu...

Embodiment 2

[0030] Embodiment 2: a kind of lithium vanadium phosphate cathode material, the preparation method is as follows, first weigh the lithium phosphate of 365.8g, the vanadyl oxalate of 477.7g, the sucrose of 126.5g and 84g triton, the above-mentioned raw materials are dispersed in 1581g of Prepare a suspension with a solid content of 40% in deionized water; then add the above suspension into a reaction kettle, heat it to 150°C under airtight conditions and react for 10 hours, after the reaction is completed and cooled to room temperature, wash, filter and dry to obtain vanadium phosphate Lithium precursor powder; then take by weighing 18 grams of ammonium metavanadate and 450 grams of lithium vanadium phosphate precursor powder, fully mix in a high-speed disperser, then above-mentioned raw materials are roasted at a high temperature for 5h under nitrogen atmosphere protection, and the roasting temperature is 600°C, and then cooled to room temperature to obtain lithium vanadium pho...

Embodiment 3

[0031] Embodiment 3: A lithium vanadium phosphate positive electrode material, the preparation method is as follows, first weigh 355g of ammonium dihydrogen phosphate, 181.1g of vanadium pentoxide, 0.4g of magnesium oxide, 201.3g of lithium acetate, 73.8g of poly Vinyl alcohol and 38g cetyltrimethylammonium bromide, the above raw materials are dispersed in 3400g of deionized water to form a suspension with a solid content of 20%; Heat to 250°C and react for 5 hours. After the reaction is completed and cool to room temperature, wash, filter and dry to obtain the precursor powder of lithium vanadium phosphate; then weigh 36 grams of ammonium metavanadate and 450 grams of lithium vanadium phosphate precursor powder, and Fully mixed in the machine, and then the above-mentioned raw materials were roasted at a high temperature for 2 hours under the protection of nitrogen atmosphere, the roasting temperature was 700 ° C, and then cooled to room temperature to obtain lithium vanadium p...

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Abstract

The invention discloses a vanadium lithium phosphate cathode material and a preparation method thereof, and relates to the technical field of lithium ion battery electrode material and preparation technology thereof. The material particle structure comprises a V2O5 hollow ball casing and a Li3V2-xMx(PO4)3 / C spherical karyoplast positioned in the casing, the casing is separated from the karyoplastmaterial, a molecular formula of the material is Li3V2-xMx(PO4)3 / C.ZV2O5, and the karyoplast Li3V2-xMx(PO4)3 / C is prepared by a hydro-thermal method. The material has higher discharge capacity, powerperformance, low temperature performance and circulation performance, there is a larger electrolyte accommodation space between the casing and the karyoplast, contact, wetting and liquid maintaining capacities of the material with the electrolyte can be improved, lithium ions of the material can be rapidly de-embedded and transferred in the electrolyte during large-power charging / discharging, theelectrolyte can be consumed normally under the long-term high temperature circulation or storage condition, electric performances including large power charging / discharging, extremely low temperaturedischarging and high temperature circulation of the vanadium lithium phosphate material can be further improved, and application of the vanadium lithium phosphate material in the lithium ion power battery field is prompted.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrode materials and preparation thereof, and in particular provides a lithium vanadium phosphate positive electrode material and a preparation method thereof. Background technique [0002] Lithium vanadium phosphate (Li 3 V 2 (PO4) 3 ) positive electrode material has high lithium ion diffusion efficiency, high discharge capacity (theoretical capacity is 197mAh / g) and energy density, and has good cycle performance and thermal stability, and has attracted extensive attention in the academic and engineering circles. In addition, lithium vanadium phosphate has a three-dimensional lithium ion diffusion channel. Compared with lithium iron phosphate with the same one-dimensional ion diffusion channel, its rate and low-temperature performance have been significantly improved. Therefore, lithium vanadium phosphate material is one of the preferred positive electrode materials for the deve...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 陈立鹏陈念张可君万志强
Owner 骆驼集团武汉光谷研发中心有限公司
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