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Method for preparing tin-carbon composite material for cathode of lithium ion battery

A lithium-ion battery and composite material technology, which is applied in the field of lithium-ion battery negative electrode materials and the preparation thereof, can solve the problems of unreported cycle capacity, unfavorable large-scale production, expensive synthetic raw materials, etc., and achieves high volumetric energy density and saving The effect of energy, simple method

Inactive Publication Date: 2011-10-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for better ways to make batteries that have both good electrical properties (high capacitance) but also improved cycling durability without adding more weight or costly components like conductive agents such as silver powder. Additionally, when making these composites into anodes made from them, they are easier to manufacture compared to existing methods due to their ease of use.

Problems solved by technology

This patented technical issue addressed in this patents relates to developing new types of Lithium-lon Battery Negative Electro Capacity LixCoSb2−zagrite type cathodes without requiring costly processes like vacuum evaporation or liquid phase growth. Additionally, the objective sought to improve upon existing techniques involving complex manufacturing procedures while maintaining superior properties including higher capacities, longer lifespans, better cycling capabilities, lower resistance ratios, increased safety margin, reduced costs associated with alternative sources, etc., especially when compared to other alternatives.

Method used

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  • Method for preparing tin-carbon composite material for cathode of lithium ion battery
  • Method for preparing tin-carbon composite material for cathode of lithium ion battery
  • Method for preparing tin-carbon composite material for cathode of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1) with fructose (C 6 h 12 o 6 ) and stannous chloride dihydrate (SnCl 2 .2H 2 O) as the initial raw material, 13.3g of fructose was dissolved in 20mL of water, and 10.0g of SnCl was added to the solution 2 .2H 2 O, stir mechanically to obtain a colorless or light yellow transparent mixed solution, heat while stirring, and raise the temperature to 80°C until the water is evaporated to dryness, then dry at 130°C for 2h to obtain the mixture;

[0033] 2) In a flowing high-purity argon atmosphere, raise the temperature of the obtained mixture to 200°C at 5°C / min and keep it warm for 2 hours, then raise the temperature to 400°C at 2°C / min, and cool down to 100°C at 5°C / min, Then wait for it to cool down to room temperature naturally, and the obtained product is the tin-carbon composite material for lithium-ion battery negative electrode.

[0034] Mix the above-mentioned tin-carbon composite material for lithium-ion battery negative electrode with 10wt% conductive agen...

Embodiment 2

[0036] 1) with fructose and (SnCl 2 .2H 2 O) is the initial raw material, 10.0g fructose is mixed with the solution of 5.56mol / L, adds 10.0g SnCl in the solution 2 .2H 2 O, stir mechanically to obtain a colorless or light yellow transparent mixed solution, heat while stirring, and raise the temperature to 80°C until the water is evaporated to dryness, then dry at 130°C for 2h to obtain the mixture;

[0037] 2) In a flowing high-purity argon atmosphere, raise the temperature of the obtained mixture to 200°C at 5°C / min and keep it for 2h, then raise the temperature to 500°C at the same rate and keep it for 2h, then cool it down at 5°C / min to 100°C, and then naturally cooled to room temperature, the resulting product is the tin-carbon composite material for the negative electrode of lithium-ion batteries. Its XRD pattern is as follows figure 1 as shown, Figure 7 Its transmission electron microscope picture.

[0038] The material was tested using the same method and condit...

Embodiment 3

[0040] 1) with fructose and SnCl 2 .2H 2 O is the initial raw material, 10.0g fructose is formulated into a 5.56mol / L solution, and 10.0g SnCl is added to the solution 2 .2H 2 O, stir mechanically to obtain a colorless or light yellow transparent mixed solution, heat while stirring, and raise the temperature to 90°C until the water is evaporated to dryness, then dry at 130°C for 2h to obtain the mixture;

[0041] 2) In a flowing high-purity argon atmosphere, raise the temperature of the obtained mixture to 170°C at 5°C / min and keep it for 2h, then raise the temperature to 230°C at 2°C / min and keep it for 2h, and then heat it at 2°C / min Raise the temperature to 600°C and keep it warm for 2 hours, then cool it down to 100°C at 5°C / min, and then let it cool down to room temperature naturally. The resulting product is the tin-carbon composite material for the negative electrode of lithium-ion batteries.

[0042] The same method and conditions as in Example 1 were used to test t...

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Abstract

The invention provides a method for preparing a tin-carbon composite material for a cathode of a lithium ion battery in situ by using a so-gel method, comprising the following steps: dissolving stannous chloride in a fructose solution, heating to 75-90 DEG C and stirring at the condition of heat preservation until the moisture is evaporated; drying for 2-4 hours at the temperature of 110-130 DEG C; heating the dried product to 170-230 DEG C for about 2 hours in an inert atmosphere; heating to 400-700 DEG C for 2 hours; and cooling to obtain the tin-carbon composite material, wherein the mole ratio of the fructose to the stannous chloride dehydrate is 1: (0.4-1.6). The method is simple, the raw material cost is low, the specific capacity of the prepared tin-carbon composite material is high and the cycle performance is good.

Description

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Claims

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Application Information

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Owner NANJING UNIV
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