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A kind of preparation method of lithium iron molybdate lithium iron battery cathode material

A lithium-ion battery, lithium iron molybdate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low discharge specific capacity, poor cycle performance, unstable structure, etc., achieve low reaction temperature and simple method , the effect of uniform particle dispersion

Active Publication Date: 2019-06-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when LiFe(MoO 4 ) 2 As a positive electrode material, the discharge specific capacity is low, the cycle performance is poor, the structure is unstable, and the reaction temperature is high, etc., which are still technical problems that need to be solved urgently.

Method used

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  • A kind of preparation method of lithium iron molybdate lithium iron battery cathode material
  • A kind of preparation method of lithium iron molybdate lithium iron battery cathode material
  • A kind of preparation method of lithium iron molybdate lithium iron battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Mix 1.258g (0.017mol) of lithium carbonate, 2.73g (0.017mol) of ferric oxide and 12.007g (0.0097mol) of ammonium molybdate tetrahydrate, add 15mL pure water, and ball mill at 180r / min 6h, get mixed powder;

[0034] (2) Add 25 mL of pure water to the mixed powder obtained in step (1), and conduct ultrasonic treatment at 35 kHz for 6 hours to obtain a mixture;

[0035] (3) Rapidly cool the mixture obtained in step (2) with liquid nitrogen, and freeze-dry at -30°C and 60Pa pressure to obtain a red solid powder;

[0036] (4) Put the red solid powder obtained in step (3) in a muffle furnace, pre-fire it at 500°C for 2 hours, then bake it a second time at 650°C for 24 hours, and cool it down to room temperature naturally to obtain the positive electrode of lithium-ion battery Material lithium iron molybdate.

[0037] Such as figure 1 As shown, the positive electrode material lithium iron molybdate obtained in this embodiment is pure phase LiFe(MoO 4 ) 2 , p-1 crystal...

Embodiment 2

[0042] (1) Mix 1.418g (0.019mol) of lithium carbonate, 3.065g (0.019mol) of ferric oxide and 10.944g (0.076mol) of molybdenum trioxide, add 20mL of pure water, and ball mill for 8 hours at 200r / min. get mixed powder;

[0043] (2) Add 30 mL of pure water to the mixed powder obtained in step (1), and conduct ultrasonic treatment at 50 kHz for 8 hours to obtain a mixture;

[0044] (3) Rapidly cool the mixture obtained in step (2) with liquid nitrogen, freeze-dry at -35°C and 100Pa pressure to obtain a red solid powder;

[0045] (4) Put the red solid powder obtained in step (3) in a muffle furnace, pre-fire it at 550°C for 3 hours, then bake it a second time at 700°C for 30 hours, and cool it down to room temperature naturally to obtain the positive electrode of lithium-ion battery Material lithium iron molybdate.

[0046] The assembly of battery: take by weighing 0.40g present embodiment gained LiFe(MoO 4 ) 2 Materials, add 0.05g acetylene black as conductive agent and 0.05g ...

Embodiment 3

[0049] (1) Mix 0.766g (0.032mol) of lithium hydroxide, 2.56g (0.016mol) of ferric oxide and 11.301g (0.0091mol) of ammonium molybdate tetrahydrate, add 10mL of pure water, and at 160r / min, Ball milling for 4 hours to obtain mixed powder;

[0050] (2) Add 20 mL of pure water to the mixed powder obtained in step (1), and conduct ultrasonic treatment for 4 hours at 20 kHz to obtain a mixture;

[0051] (3) Rapidly cool the mixture obtained in step (2) with liquid nitrogen, and freeze-dry at -20°C and 30Pa pressure to obtain a red solid powder;

[0052] (4) Place the red solid powder obtained in step (3) in a muffle furnace, pre-fire it at 450°C for 1 hour, then bake it a second time at 600°C for 18 hours, and cool it down to room temperature naturally to obtain the positive electrode of the lithium-ion battery Material lithium iron molybdate.

[0053] The assembly of battery: take by weighing 0.40g present embodiment gained LiFe(MoO 4 ) 2 Materials, add 0.05g acetylene black a...

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Abstract

The invention relates to a method for preparing a positive-pole material LiFe(MoO4)2 of a lithium-ion battery. The method comprises the following steps: (1) mixing a lithium source, ferric oxide and a molybdenum source according to a stoichiometric ratio of three elements, i.e., Li, Fe and Mo required by LiFe(MoO4)2, then, adding water, and carrying out ball-milling, so as to obtain mixed powder; (2) adding water, and carrying out ultrasonic treatment, so as to obtain a mixture; (3) carrying out cooling with liquid nitrogen, and carrying out freeze drying, so as to obtain red solid powder; (4) firstly, carrying out preburning, then, carrying out secondary roasting, and naturally cooling to room temperature, thereby obtaining the positive-pole material LiFe(MoO4)2 of the lithium-ion battery. According to the method, the positive-pole material LiFe(MoO4)2 of the lithium-ion battery is of a pure-phase p-1crystal form with the particle size of not greater than 1 micron; the battery is assembled, the first-time discharging specific capacity can reach 220mAh / g under the multiplying factor of 0.1C, and the retentivity after 30 cycles reaches to 68%; the method provided by the invention is simple, the reaction temperature is low, the process requirements are low, and thus, the industrial batch production is facilitated.

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 iron molybdate, a positive electrode material of a lithium ion battery. Background technique [0002] With the consumption of non-renewable energy such as fossil energy (oil, natural gas), the arrival of energy crisis has attracted more and more attention. In this context, green and non-polluting new high-energy chemical power sources have become a hot spot in the development of countries all over the world. [0003] Lithium-ion battery is a new type of chemical power source, which is composed of two compounds that can reversibly insert and extract lithium ions as positive and negative electrodes respectively. When the battery is charged, lithium ions are deintercalated from the positive electrode and intercalated in the negative electrode; when the battery is discharged, lithium ions are deintercala...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/58H01M10/0525
CPCH01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 童汇周其杰张宝陈核章王旭郑俊超张佳峰喻万景姚赢赢
Owner CENT SOUTH UNIV