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Method for preparing tin-nickel alloy of cathode materials of lithium ion battery by electrolyzing melted salt

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve problems such as performance degradation, achieve the effects of reducing energy consumption, accelerating electrolytic reaction speed, and reducing production costs

Inactive Publication Date: 2010-01-20
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume expansion of Sn in the process of lithium intercalation and deintercalation can reach 100-300%, which makes the negative electrode of the battery cause pulverization and peeling due to repeated huge changes in volume after more than a dozen cycles, and the performance drops sharply.

Method used

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  • Method for preparing tin-nickel alloy of cathode materials of lithium ion battery by electrolyzing melted salt
  • Method for preparing tin-nickel alloy of cathode materials of lithium ion battery by electrolyzing melted salt

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Will analyze pure NiO and SnO 2 The powder is mixed according to the molar ratio of 3:4, adding 3-10wt% graphite powder, wet milling in a ball mill for 3 hours, taking out and drying, weighing 2.5g of the sample, and then pressing the powder into a diameter of 10mm under 30MPa, A cylinder with a height of 3.5mm, and sintered at 850-1250°C for 2-4 hours to obtain a sintered oxide sheet; hang the sintered oxide sheet on an iron-chromium-aluminum wire, and wrap the periphery with an iron-chromium-aluminum wire, as Cathode; High-purity graphite rod is used as anode. Insert it into the CaCl 2 In the alumina crucible mixed with NaCl molten salt, under the protection of Ar gas, the electrolysis is carried out at a controlled voltage of 2.3-3.2V. The electrolysis temperature is 600-750°C. After 6-10 hours of electrolysis, the electrolysis is ended; cooling in an inert atmosphere After washing with distilled water and drying, the product is pure phase Ni 3 sn 4 alloy.

[00...

Embodiment 2

[0027] Will analyze pure NiO and SnO 2 The powder is mixed in a molar ratio of 1:1, and 5-15wt% of CaCO is added 3 , wet milled in a ball mill for 3 hours, took out and dried, then weighed 2.5g of the sample, pressed the powder into a cylinder with a diameter of 10mm and a height of 3.5mm at 30MPa, and sintered it at 850-1250°C for 3-8 Hours, the oxide sintered sheet is obtained; the oxide sintered sheet is suspended on the iron-chromium-aluminum wire, and the periphery is wrapped with the iron-chromium-aluminum wire as the cathode; a high-purity graphite rod is used as the anode. Insert it with CaCl 2 In the alumina crucible mixed with NaCl molten salt, under the protection of Ar gas, the electrolysis is carried out at a controlled voltage of 2.0-3.2V, and the electrolysis temperature is 650-780°C. After 5-8 hours of electrolysis, the electrolysis is ended; it is cooled in an inert atmosphere After washing with distilled water and drying, the product is Ni 3 sn 4 / Ni 3 s...

Embodiment 3

[0030] Will analyze pure NiO and SnO 2 The powder is mixed according to the molar ratio of 2:1, 3-15wt% of starch is added, wet-milled in a ball mill for 3 hours, taken out and dried, then weighed 2.5g of the sample, and pressed the powder into a diameter of 10mm under 30MPa, with a height of 3.5mm cylinder, and sinter it at 850-1250°C for 2-4 hours to obtain oxide sintered sheet; hang the oxide sintered sheet on molybdenum wire, and wrap the periphery with molybdenum wire as the cathode; adopt high-purity Graphite rods serve as anodes. Insert it into the CaCl 2 In the alumina crucible mixed with NaCl molten salt, under the protection of Ar gas, the electrolysis is carried out at a controlled voltage of 2.0-3.2V, and the electrolysis temperature is 600-780°C. After 8-16 hours of electrolysis, the electrolysis is ended; cooling in an inert atmosphere After washing with distilled water, and drying, the product is Ni / Ni 3 sn 4 / Ni 3 sn 2 alloy compound.

[0031] The prepar...

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Abstract

The invention relates to a method for preparing tin-nickel alloy of cathode materials of a lithium ion battery by electrolyzing melted salt. The method comprises the following steps: uniformly mixing oxides of tin and nickel, sintering to obtain a sinter cake after slurry-casting or pressing shaping, compounding the sinter cake with a conductive current collector into a cathode, using graphite as an anode, using mixed electrolyte of CaCl2 or CaCl2, NaCl as a melt; controlling electrolysis voltage not to be less than theoretical decomposition voltage of the melted salt, controlling electrolysis temperature at 550-850 DEG C, protecting electrolysis process by inert gases, and preparing the tin-nickel alloy with Sn / Ni atom ratio of 4:3-1:3. The invention has short production process, low energy consumption, little pollution and easy continuous production; and the prepared tin-nickel alloy of the cathode materials of the lithium ion battery has high specific capacity and stable circulation property.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation technology for preparing tin-nickel alloy, a negative electrode material of lithium ion batteries, by using molten salt electrolysis. Background technique [0002] Since the successful development of lithium-ion batteries in the 1990s, they have been applied to portable electronic devices, Electric vehicles, aerospace and many other civilian and military fields. At present, the anode materials of lithium-ion batteries are mainly carbon materials, but their specific capacity is low (372mAh / g). In addition, carbon materials, as the anode materials of lithium-ion batteries, are inevitably used during the first charging and discharging process of the battery. The reaction at the interface between the carbon negative electrode and the electrolyte forms a thin passivation layer (SEI film) covering the carbon electrode, causing irreversible energy loss, an...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/38
CPCY02E60/12Y02E60/10
Inventor 戴磊王岭周会珠李跃华赵艳琴
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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