Method for preparing tin-based sulfide lithium ion battery negative active material under room temperature

A negative electrode active material, tin-based sulfide technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large volume change and short cycle life of tin-based negative electrode materials, and achieves short reaction cycle time and improved efficiency. The effect of high cycle life and specific capacity

Pending Publication Date: 2019-07-26
HARBIN INST OF TECH +1
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Problems solved by technology

[0003] In order to solve the problem of short cycle life caused by the large volume change of existing tin-based negative electrode materials, the present invention proposes a method for preparing tin-based sulfide lithium ion battery negative electrode active materials at room temperature

Method used

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  • Method for preparing tin-based sulfide lithium ion battery negative active material under room temperature
  • Method for preparing tin-based sulfide lithium ion battery negative active material under room temperature
  • Method for preparing tin-based sulfide lithium ion battery negative active material under room temperature

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specific Embodiment approach 1

[0036] Embodiment 1: The method for preparing the negative electrode active material of a tin-based sulfide lithium ion battery at room temperature in this embodiment is carried out according to the following steps:

[0037] 1. SnCl 2 ·2H 2 O is dissolved in deionized water to obtain solution a;

[0038] 2. Dissolving potassium ethyl xanthate in deionized water to obtain solution b;

[0039] 3. Dispersing the conductive carbon material into deionized water to obtain dispersion c;

[0040] 4. Mix the solution a and the dispersion c and continue to stir to obtain the solution d;

[0041] 5. Add solution b dropwise to solution d under stirring, stop stirring after the dropwise addition is completed, seal the container containing solution d, and finally stand for treatment to obtain a precipitated product;

[0042] Sixth, taking the precipitation product obtained in step 5, and sequentially performing suction filtration, washing with deionized water and vacuum drying on the pr...

specific Embodiment approach 2

[0051] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the molar concentration of Sn ions in the solution a in step 1 is 0.2-4M. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0052] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass fraction of potassium ethyl xanthate in the solution b in step 2 is 0.2-2%. Other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention provides a method for preparing a tin-based sulfide lithium ion battery negative active material under a room temperature, and relates to a preparation method of a lithium ion battery negative active material. The method aims to solve the problem of short cycle lifetime caused by large volume change of a tin-based negative electrode material. The method comprises the steps of firstly, preparing, in which a SnCl<2>.2H2O aqueous solution, an ethylxanthic acid potassium salt aqueous solution and a conductive carbon material dispersing liquid are prepared, and the SnCl<2>.2H2O aqueous solution is mixed with the conductive carbon material dispersing liquid; secondly, adding the ethylxanthic acid potassium salt aqueous solution to obtain a precipitation product; and finally, performing pumping, washing and vacuum drying. The ethylxanthic acid potassium salt is applied to the field of lithium ion battery preparation, the function of an organic framework is achieved, so that thetin-based material is fully dispersed, the volume effect is reduced, and the cycle lifetime is prolonged. The method is suitable for preparing the lithium ion battery negative active material.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode active material of a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in fields such as aviation, communications, portable electronics, and electric vehicles. As the power source of electric vehicles, the performance of lithium-ion batteries is the key to electric vehicles. With the continuous improvement of the mileage requirements for new energy vehicles, improving the energy density of lithium-ion batteries has become a very important requirement. Graphite is the most commonly used anode material in lithium-ion batteries, and its actual capacity is close to the theoretical capacity limit (372mAh g -1 ). It has become very urgent to develop anode materials with high specific energy. Tin-based materials have the advantages of high capacity, large reserves, environmental friendliness, and high safety, and are considered to be one of the mos...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/0525
CPCH01M4/366H01M4/60H01M4/625H01M10/0525Y02E60/10
Inventor 戴长松陈天瑞丁飞刘建超李如宏穆德颖桑林
Owner HARBIN INST OF TECH
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