A kind of antimony sulfide-based negative electrode material for lithium ion battery and preparation method thereof

A lithium-ion battery, antimony sulfide-based technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of low capacity output, poor cycle stability, low first Coulombic efficiency, etc., to increase electronic conductivity , Relieve agglomeration and improve Coulombic efficiency

Active Publication Date: 2021-09-21
浙江霖润新能源科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of antimony sulfide-based negative electrode material for lithium-ion batteries and its preparation method in order to solve the problems of low initial coulombic efficiency, poor cycle stability and low capacity output of existing antimony sulfide-based negative electrode materials

Method used

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  • A kind of antimony sulfide-based negative electrode material for lithium ion battery and preparation method thereof
  • A kind of antimony sulfide-based negative electrode material for lithium ion battery and preparation method thereof
  • A kind of antimony sulfide-based negative electrode material for lithium ion battery and preparation method thereof

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preparation example Construction

[0030] A preparation method for an antimony sulfide-based negative electrode material for a lithium ion battery, comprising the following steps:

[0031] Step 1: placing antimony trioxide, expanded graphite and sulfur powder in a ball mill jar to obtain a premixed material; the mass ratio of described antimony trioxide, expanded graphite and sulfur powder is preferably (0.2-0.6):( 0.05-0.15): (0.4-0.6), more preferably 0.3:0.1:0.5, the sources of described antimony trioxide and sulfur powder are all commercially available, and expanded graphite is made of commercial expandable graphite in a room full of inert atmosphere It is obtained by treating in a tube furnace at a high temperature of 1000°C for 1 minute, and the heating rate is 10°C / min. The size of antimony trioxide is micron or below, preferably an average size of 700nm, the diameter of expandable graphite is preferably 75 microns, the sulfur powder is preferably sublimed sulfur, and the ball milling tank is preferably ...

Embodiment 1

[0038] 1) Weigh 0.3g of antimony trioxide (size 700nm) and 0.1g of expanded graphite according to the mass ratio of 3:1:5. , the heating rate is 10 degrees per minute, and the expandable graphite diameter is 75 microns) and 0.5g sublimated sulfur powder material in a low-energy planetary ball mill tank to obtain a premixed material;

[0039] 2) According to the mass ratio of ball to material of 50:1, weigh the ball milling beads made of zirconia and mix them with the premixed material in the above step 1), the ball milling time is 30h, and the speed is 400r / min to obtain antimony trioxide / expanded graphite / Sulfur powder ternary mixed material.

[0040] 3) The ternary mixed material obtained in the above step 2) is annealed at a temperature of 500° C. for 2 hours in an argon protective gas, and then the antimony sulfide-based negative electrode material Sb for lithium ion batteries is obtained. 2 S 3 @EG'-S.

[0041] Embodiment 1 gained Sb 2 S 3 The XRD pattern of @EG’-S...

Embodiment 2

[0044] The preparation method and conditions are the same as in Example 1, except that the ball milling time is 8h and 15h.

[0045] Figure 7 For the Sb obtained in Example 2 2 S 3 The first charge and discharge curves of the @EG’-S composite anode material for the lithium half-cell at a voltage range of 0.01-3.0V and a current density of 200mA / g when the ball milling time is 8h and 15h. When the ball milling time is 8 hours, the first discharge specific capacity is 890.9mAh / g, the first charge specific capacity is 730.4mAh / g, and the first Coulombic efficiency is 82%; when the ball milling time is 15 hours, the first discharge specific capacity is 930.1mAh / g, and the first charge specific capacity is 772.9mAh / g, the first Coulombic efficiency was 83.1%.

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Abstract

The invention provides an antimony sulfide-based negative electrode material for lithium ion batteries and a preparation method thereof, and relates to the field of lithium ion battery negative electrode materials. The method is to use mechanical ball milling method to mechanically mix antimony trioxide, expanded graphite and sulfur powder for a long time at high speed to form a composite material, and anneal and vulcanize in argon to obtain antimony sulfide with sulfur-doped graphite-encapsulated antimony sulfide structure base composite material. In the present invention, compounding with sulfur-doped graphite material and graphene exfoliated from expanded graphite can increase the electronic conductivity of antimony sulfide, and at the same time, the encapsulation structure formed by the presence of sulfur powder during ball milling is conducive to alleviating the vulcanization caused by volume expansion. Agglomeration of antimony; their joint action greatly improves the initial Coulombic efficiency, reversibility of conversion reaction, cycle stability and rate performance. The mechanical ball milling method of the invention is simple and easy to operate, and is convenient for large-scale production.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to an antimony sulfide-based negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Due to its high energy density and long cycle life, lithium-ion batteries have been widely used in many fields such as portable electronic devices, electric vehicles, and energy storage, and have become a necessity in people's daily life. However, the theoretical specific capacity of the currently widely used commercial graphite anode is only 372 mAh g -1 , seriously restricting the development of high-capacity and high-power lithium-ion batteries, therefore, the development of high specific capacity anode materials is imminent. At present, silicon-based, tin-based, antimony-based, and transition metal oxides are widely studied as high-capacity anode materials, but they all have disadvantages such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/36H01M10/0525H01M4/48H01M4/62H01M4/583C01B32/20
CPCC01B32/20H01M4/362H01M4/48H01M4/5815H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 程勇王少华申亚斌王立民尹东明梁飞
Owner 浙江霖润新能源科技有限公司
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