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Preparation method of polyanion cathode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of daily ion disorder, high-temperature capacity decline, and high price, and achieve stability and batch consistency. Avoid falling, suppress the effect of impurity

Inactive Publication Date: 2012-08-15
北京宏福源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

LiCoO 2 and LiNiO 2 The theoretical capacity of LiCoO is relatively large (both 274mAh / g), but due to the limitation of phase transition caused by lithium deintercalation process, the actual capacity is only about 130mAh / g, LiCoO 2 The Co in LiNiO is toxic and expensive, which limits its application; while LiNiO 2 The preparation of a pure phase is very difficult, there is a problem of ion disorder, and the thermal stability is very poor; spinel LiMn 2 o 4 Although it has a price advantage, the rapid decline in its high-temperature capacity caused by the dissolution of Mn is its main problem

Method used

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  • Preparation method of polyanion cathode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 1 mol of lithium dihydrogen phosphate, 0.5 mol of ferric oxide, and 30 g of glucose into 250 ml of water, use a nitrogen-filled grinder to mix the raw materials evenly, and use a closed nitrogen-protected spray drying equipment to dry the slurry to obtain a precursor powder , and then the precursor powder was sintered at 700°C for 16h in a box furnace with a nitrogen atmosphere, and then pulverized in a jet mill with an atmosphere protection to obtain lithium iron phosphate (LiFePO 4 )Material.

[0025] Then, lithium iron phosphate was used as the positive electrode material of lithium ion battery to make a simulated battery, and the battery performance test was carried out. First, the active material, PVDF and Super-P are dispersed in N-methylpyrrolidone (NMP) at a mass ratio of 85:10:5 to make a slurry, and then the slurry is coated on An electrode sheet is formed on the aluminum foil, and the electrode sheet is dried in a vacuum oven at 110° C. for 12 hours. Pu...

Embodiment 2

[0029] Add 1mol of lithium dihydrogen phosphate, 1mol of ferrous oxalate, and 25g of citric acid into 250ml of water, use a nitrogen-filled grinder to mix the raw materials evenly, and use a closed nitrogen-protected spray drying equipment to dry the slurry to obtain the precursor powder. The precursor powder is continuously passed through N 2 / H 2 (95:5) sintered at 720°C for 16h in a box-type furnace with a mixed atmosphere, and then pulverized in a jet mill equipped with nitrogen protection to obtain lithium iron phosphate (LiFePO 4 )Material. Other experimental steps and testing steps are the same as in Example 1.

[0030] Tests on battery performance found that the 0.1C discharge capacity of lithium iron phosphate material reached 155mAh / g.

Embodiment 3

[0032] Add 1mol of lithium hydroxide, 1mol of iron phosphate, and 28g of carbon gel into 250ml of water, stir the raw materials evenly with a grinder that can be filled with nitrogen, and dry the slurry with a closed nitrogen-protected spray drying equipment to obtain the precursor powder. The precursor powder was sintered at 700 °C for 16 hours in a box furnace with an Ar atmosphere, and then pulverized in a jet mill with nitrogen protection to obtain lithium iron phosphate (LiFePO4) with a D50 particle size of 3-6 μm. 4 )Material. Other experimental steps and testing steps are the same as in Example 1.

[0033] Tests on battery performance found that the 0.1C discharge capacity of lithium iron phosphate material reached 153mAh / g.

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Abstract

The invention relates to a preparation method of a polyanion cathode material of a lithium ion battery. The cathode material is a polyanion compound expressed by LiMx(XOy)z (Formula I). The preparation method comprises the following steps: uniformly stirring and mixing a lithium source, an M source, an X source and an electric conduction additive in a solvent under the protection of an inert atmosphere to obtain slurry; drying the slurry under the protection of an inert atmosphere to obtain a precursor material; sintering the precursor material under the protection of an inert atmosphere to obtain the polyanion compound; and crushing the obtained polyanion compound under the protection of an inert atmosphere. The overall processes of the preparation method are finished under the protection of the inert atmosphere, thus the oxidation of the prepared polyanion compound in the preparation process is effectively prevented, the generation of a mixed phase of the material is inhibited, and the declining of the electrical property of the material is avoided.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, and more specifically relates to a preparation method for polyanion cathode materials for lithium ion batteries. Background technique [0002] Cathode materials for lithium-ion secondary batteries undergo a layered structure of LiCoO 2 , LiNiO 2 , LiMn with spinel structure 2 o 4 Wait for several stages of development. LiCoO 2 and LiNiO 2 The theoretical capacity of LiCoO is relatively large (both 274mAh / g), but due to the limitation of phase transition caused by lithium deintercalation process, the actual capacity is only about 130mAh / g, LiCoO 2 The Co in LiNiO is toxic and expensive, which limits its application; while LiNiO 2 The preparation of a pure phase is very difficult, there is a problem of ion disorder, and the thermal stability is very poor; spinel LiMn 2 o 4 Although it has an advantage in price, its main problem is the rapid decline of its high-temperature capacity caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 刘志坚夏建华张余莉陈路星
Owner 北京宏福源科技有限公司
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