A kind of preparation method of lithium ion battery sns2/snsb composite negative electrode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low specific capacity, poor cycle performance and rate performance, and achieve avoidance of agglomeration and improvement of poor conductivity Effect

Inactive Publication Date: 2019-05-17
SHENZHEN POLYTECHNIC
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the current negative electrode materials of lithium batteries have the problems of low specific capacity and poor cycle performance and rate performance. A kind of SnS for lithium ion batteries is proposed 2 / SnSb composite anode material preparation method, improve electrode cycle stability, and prepare high-capacity and high-stability lithium-ion battery anode materials, thereby improving the overall performance of power lithium-ion batteries

Method used

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  • A kind of preparation method of lithium ion battery sns2/snsb composite negative electrode material
  • A kind of preparation method of lithium ion battery sns2/snsb composite negative electrode material

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Embodiment Construction

[0015] The invention proposes a lithium ion battery SnS 2 The preparation method of / SnSb composite negative electrode material comprises the steps:

[0016] Step 1: Weigh SnCl according to the ratio of the amount of substances to 1:2 4 ·5H 2 Add O and thioacetamide to the polyethylene glycol solution, stir well until it is completely dissolved, then transfer the solution into the polytetrafluoroethylene tank of the hydrothermal synthesis reactor, keep it warm at 180°C for 15h, and cool The final product was washed repeatedly with deionized water and ethanol, and dried in vacuum to obtain brown SnS 2 powder;

[0017] Step 2: The above obtained SnS 2 The powder was dissolved in absolute ethanol, and SnCl was added 2 2H 2 O and SbCl 3 , adding SnCl 2 and SbCl 3 The ratio of the amount of substances is controlled in SnCl 2 / SbCl 3 =3~1, fully stir until completely dissolved to obtain solution A;

[0018] Step 3: Prepare 0.15mol / L NaBH 4 solution, under magnetic stirri...

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Abstract

The invention relates to a method for preparing an SnS2 / SnSb composite negative-pole material of lithium-ion batteries. The method comprises the following steps: (1) adding SnCl4.5H2O and thioacetamide into a polyethylene glycol solution, carrying out stirring, transferring the mixture into a polytetrafluoroethylene tank, carrying out heat preservation for 15 hours at the temperature of 180 DEG C, repeatedly washing a cooled product with deionized water and ethanol, and carrying out vacuum drying, so as to obtain SnS2 powder; (2) dissolving the SnS2 powder in anhydrous ethanol, adding SnCl2.2H2O and SbCl3, and carrying out stirring, so as to obtain a solution A; (3) preparing a 0.15mol / L NaBH4 solution, carrying out magnetic stirring, and adding the NaBH4 solution into the solution A, so as to obtain a solution B; (4) stirring the solution B for 4 to 8 hours at the temperature of 70 DEG C to 90 DEG C, so as to obtain a solution C; (5) transferring the solution C into a polytetrafluoroethylene tank of a hydrothermal synthesis reactor, carrying out heat preservation for 24 hours at the temperature of 140 DEG C to 160 DEG C, washing the cooled product with deionized water and anhydrous ethanol, and carrying out vacuum drying. The negative-pole material obtained by the method is high in capacity and good in cycle performance and has a potential application prospect in the fields of portable electronic devices, power automobiles and the like.

Description

technical field [0001] The invention relates to the field of lithium ion battery negative electrode materials, in particular to a lithium ion battery SnS 2 / SnSb composite anode material preparation method. SnS 2 That is, tin disulfide, and SnSb is tin-antimony alloy. Background technique [0002] With the development of portable electronic devices and power vehicles, higher challenges are put forward for lithium-ion batteries, which not only require high energy density, but also require good cycle performance. The negative electrode material, as the main body of lithium-ion battery storage, realizes the intercalation and extraction of lithium ions during charge and discharge, and is a key part of the entire battery. At present, the anodes of commercial lithium-ion batteries mainly use various carbon materials. The graphite anode materials with better performance on the market can reach 360mAh / g, and the performance has almost reached the ceiling (the theoretical capacity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/38H01M10/0525
CPCH01M4/364H01M4/387H01M4/5815H01M10/0525Y02E60/10
Inventor 罗大为
Owner SHENZHEN POLYTECHNIC
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