Preparation method of lithium vanadium phosphate of lithium ion batteries cathode materials

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as complex processes and insufficient parameter values, and achieve the effects of wide sources, stable discharge voltage, and low cost

Inactive Publication Date: 2012-12-19
TIANJIN UNIV
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Problems solved by technology

[0006] Reference 1 (Liu Liying et al., Preparation and Electrochemical Performance of Lithium Vanadium Phosphate Sol-Gel [J]. Electrochemistry, 2010, 16 (4): 452-454.) discloses a vanadium phosphate prepared by a liquid phase method Lithium cathode material, its 0.5C and 1C discharge specific capacities are 143.1mAh g -1 and 130.6mAh g -1 , the parameter value is not high enough, and the process is complicated

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  • Preparation method of lithium vanadium phosphate of lithium ion batteries cathode materials
  • Preparation method of lithium vanadium phosphate of lithium ion batteries cathode materials
  • Preparation method of lithium vanadium phosphate of lithium ion batteries cathode materials

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Embodiment 1

[0029] The preparation method of lithium vanadium phosphate lithium ion battery positive electrode material, weigh V respectively by mass ratio 19.8:12.0:37.5:30.7 2 o 5 , Li 2 CO 3 , NH 4 h 2 PO 4 and citric acid. will V 2 o 5 , Li 2 CO 3 , NH 4 h 2 PO 4 Mix the dry powder evenly, add deionized water accounting for 25% of the mass fraction of the above three raw materials and stir for 1 hour; add distilled water to make citric acid into a solution with a mass concentration of 35%, add it to the above materials, and stir at a constant temperature of 80°C until solidified. Dry the above mixture at 120°C and ball mill at 250r / min; then place the mixture under N 2 In the atmosphere, raise the temperature to 800°C at 3°C / min, keep it warm for 12 hours, then cool down to room temperature with the furnace, take it out, pulverize and sieve to obtain 1# sample.

[0030] From figure 1 The X-ray diffraction spectrum of the 1# sample prepared in Example 1 shows that it is ...

Embodiment 2

[0037] The preparation method of lithium vanadium phosphate lithium ion battery positive electrode material, weigh V respectively by mass ratio 19.8:12.0:37.5:30.7 2 o 5 , Li 2 CO 3 , NH 4 h 2 PO 4 and citric acid. will V 2 o 5 , Li 2 CO3 , NH 4 h 2 PO 4 Mix the dry powder evenly, add deionized water accounting for 25% of the mass fraction of the above three raw materials and stir for 1 hour; add distilled water to make citric acid into a solution with a mass concentration of 35%, add it to the above materials, and stir at a constant temperature of 80°C until solidified. Dry the above mixture at 120°C and ball mill at 250r / min; then place the mixture under N 2 In the atmosphere, the temperature was raised to 800°C at a rate of 3°C / min, and kept for 8 hours, then cooled to room temperature with the furnace, taken out, crushed and sieved to obtain 2# sample.

[0038] From figure 1 The X-ray diffraction spectrum of the 2# sample prepared in Example 2 shows that it i...

Embodiment 3

[0044] The preparation method of lithium vanadium phosphate lithium ion battery positive electrode material, weigh V respectively by mass ratio 19.8:12.0:37.5:30.7 2 o 5 , Li 2 CO 3 , NH 4 h 2 PO 4 and citric acid. will V 2 o 5 , Li 2 CO 3 , NH 4 h 2 PO 4 Mix the dry powder evenly, add deionized water accounting for 25% of the mass fraction of the above three raw materials and stir for 1 hour; add distilled water to make citric acid into a solution with a mass concentration of 35%, add it to the above materials, and stir at a constant temperature of 80°C until solidified. Dry the above mixture at 120°C and ball mill at 250r / min; then place the mixture under N 2 In the atmosphere, raise the temperature to 800°C at 3°C / min, keep it warm for 4 hours, then cool to room temperature with the furnace, take it out, pulverize and sieve to obtain 3# sample.

[0045] From figure 1 It can be seen from the X-ray diffraction spectrum of the 3# sample prepared in Example 3, co...

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Abstract

The invention relates to a preparation method of lithium vanadium phosphate of lithium ion batteries cathode materials, which comprises the following steps: weighing a vanadium-containing compound, a lithium-containing compound and phosphate according to mol ratio of 1:(2.8-3.2):3; weighing citric acid which accounts for 30%-60% of mass of raw material, adding distilled water to prepare a 20%-50% of solution, uniformly mixing the vanadium-containing compound, the lithium-containing compound and phosphate, adding 15-45% of deionized water and reacting for 0.5-2 hours; adding a citric acid solution in the reactive raw material and heating to obtain a solid phase, drying, performing ball milling, putting into an inert atmosphere furnace and heating to the temperature of 300-1000 DEG C, and keeping the temperature for 2-24 hours to prepare lithium vanadium phosphate. The preparation method provided by the invention uses an autocatalytic reaction to uniformly mix the raw material, and is good for providing primary particles with small size to lithium vanadium phosphate.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of lithium vanadium phosphate, a positive electrode material of a lithium ion battery. Background technique [0002] With the progress of the modern era, the miniaturization and multi-functionalization of electrical appliances continue, and the corresponding requirements for batteries are also increasing. At the same time, in order to alleviate the conflict between human beings and the natural world, to seek the road of sustainable development and to protect the natural environment and natural resources has become a severe challenge for human beings after entering the 21st century. Therefore, the development and utilization of new energy and new materials has become a major issue that countries all over the world must solve. Electric energy is an indispensable and important energy source for human society. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 唐致远毛文峰凌国威徐强
Owner TIANJIN UNIV
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