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A kind of negative electrode active material and its preparation method and a kind of lithium ion battery

A negative electrode active material, stannous pyrophosphate technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low initial efficiency of Sn-based negative electrode active materials, low material tap density, etc.

Active Publication Date: 2016-04-27
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems that the existing Sn-based negative electrode active materials have low initial efficiency and low tap density, the present invention provides a method with simple preparation process, higher initial efficiency, good cycle performance and high tap density. negative electrode active material

Method used

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  • A kind of negative electrode active material and its preparation method and a kind of lithium ion battery
  • A kind of negative electrode active material and its preparation method and a kind of lithium ion battery
  • A kind of negative electrode active material and its preparation method and a kind of lithium ion battery

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preparation example Construction

[0023] The present invention also provides a method for preparing a negative electrode active material, the steps comprising: S1, mixing a solution containing a tin source with a solution containing a phosphorus source to react to obtain a suspension solution; mixing the present invention is not limited, for example, tin The source is configured as a solution containing a tin source, and the solution containing the tin source can be an aqueous solution configured with a tin source and water, and the phosphorus source is configured as a solution containing a phosphorus source, and the solution containing the phosphorus source can be an aqueous solution configured with a phosphorus source and water, Then directly mix their aqueous solutions, or add the aqueous solution of the tin source to the aqueous solution of the phosphorus source, and stir to make it react uniformly. In the present invention, it is preferable to slowly add the solution containing the phosphorus source to the...

Embodiment 1

[0038] 4.51g of stannous chloride with 2 crystal waters is dissolved in 40ml of deionized water to form solution A, 1.85g of diammonium hydrogen phosphate is dissolved in 40ml of deionized water to form solution B, and 8g of glucose Dissolve in 40ml of deionized water to form solution C, then add solution B dropwise to solution A at 6ml / min under stirring to form a white suspension solution, continue stirring for 1 hour after the addition is complete, and then Add solution C to the above-mentioned white suspension solution, and continue to stir for 30 minutes. The above reactions are all carried out in a water bath at 60°C. Finally, use 30wt% ammonia water to adjust the pH value of the above-mentioned suspension solution to 4.2; stir for 4 hours and wait for deionization Stop stirring when the water evaporates to half, and put the product into an oven at 60° C. for drying treatment. After drying, it was transferred to a tube furnace filled with argon, and the temperature was r...

Embodiment 2

[0042]Dissolve 4.3g of stannous sulfate in 30ml of deionized water to form solution A, dissolve 2.3g of diammonium hydrogen phosphate in 60ml of deionized water to form solution B, and dissolve 6g of citric acid in 30ml of deionized water to form Solution C: add solution B 10ml / min dropwise to solution A under stirring conditions to form a white suspension solution, continue stirring for 30 minutes after the addition is complete, then add solution C to the white suspension solution, and continue stirring The above reactions were all carried out in a water bath at 50°C for 30 minutes, and then the pH value was adjusted to 6.8 with 30wt% ammonia water; stirred for 2 hours and stopped when the deionized water evaporated to half, and the product was placed in a vacuum oven at 100°C Do drying. After drying, transfer it to a tube furnace with nitrogen gas, raise the temperature to 600°C at a rate of 3°C / min and keep it for 5 hours, then cool down naturally to obtain sample S2.

[0...

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Abstract

The invention provides a negative electrode active material and a preparation method thereof. The negative electrode active material comprises stannous pyrophosphate, and tin and carbon which are positioned on the surface of the stannous pyrophosphate. The negative electrode active material prepared by the method can be used for obviously improving the reversible specific capacity of a battery, has high efficiency of serving as the negative electrode active material of the battery for the first time and has a stable structure, high heat stability and high cycling stability, and the tap density of the material is obviously improved. The negative electrode active material prepared by the method is in an amorphous state; the volume change is little in a lithium embedding process; the quality specific capacity can reach twice of the theory specific capacity of the existing commercial graphite. The negative electrode active material is simple, easily available, easy to prepare, low in cost and easy to apply commercially, and establishes a basis for the development of lithium ion batteries.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, more specifically, to a negative electrode active material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, and good safety performance. At present, the negative electrode active material of commercialized lithium-ion batteries is mainly graphite. During the process of intercalating and removing lithium, the volume change of graphite is small, so it has good cycle performance. Graphite via LiC 6 Compounds reversibly store Li + , its theoretical mass specific capacity is only 372mAh / g. Therefore, scholars at home and abroad are devoting themselves to the research and development of new anode materials. Metal tin has the advantages of high theoretical specific capacity (mass specific capacity of 994mAh / g), excellent low-temperature performance, and good fast charge-dischar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/36
CPCY02E60/10
Inventor 江正福
Owner BYD CO LTD
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