阅读说明：本技术 含硫物质活化的SiO2锂电负极材料的制备方法 (Sulfur species activated SiO2Preparation method of lithium battery negative electrode material ) 是由 毛健 王飞 于 2020-12-18 设计创作，主要内容包括：本发明涉及一种含硫物质(S-8,Na-2S,K-2S或CaS)活化的SiO-2锂电负极材料的制备方法,旨在采用含硫物质对SiO-2在高温下进行活化,使得活化的SiO-2负极材料具有高的比容量,优异的倍率性能和良好的循环稳定性。制备方法包括：(1)将SiO-2与含硫物质进行充分混合,得到混合物A；(2)将步骤(1)中制备的混合物A放入Ar气氛炉中煅烧,待炉温冷却至室温,即可得到含硫物质活化的SiO-2锂电负极材料。该负极材料具有优异的锂离子储存性能；该方法制备工艺简单,易于工业化生产。(The present invention relates to a sulfur-containing substance (S) 8 ，Na 2 S，K 2 S or CaS) -activated SiO 2 The preparation method of the lithium battery cathode material aims at adopting a sulfur-containing substance to SiO 2 Activation at high temperature to give activated SiO 2 The cathode material has high specific capacity, excellent rate capability and good cycling stability. The preparation method comprises the following steps: (1) mixing SiO 2 Fully mixing with a sulfur-containing substance to obtain a mixture A; (2) putting the mixture A prepared in the step (1) into an Ar atmosphere furnace for calcining, and cooling the furnace to room temperature to obtain SiO activated by sulfur-containing substances 2 The lithium battery negative electrode material. The cathode material has the advantages ofDissimilar lithium ion storage properties; the method has simple preparation process and is easy for industrial production.)

1. SiO activated by sulfur-containing substance₂The preparation method of the lithium battery negative electrode material is characterized by comprising the following steps: (1) a certain mass of SiO₂(specific surface area greater than 10 m²(g) with a mass of a sulfur-containing substance (S)₈，Na₂S，K₂S or CaS) are fully mixed to obtain a mixture A; (2) putting the mixture A obtained in the step (1) into an Ar atmosphere furnace, calcining for 1-10 hours (the heating rate is 10 ℃/min), and cooling the furnace to room temperature to obtain SiO activated by sulfur-containing substances₂The lithium battery negative electrode material.

2. The method of claim 1, wherein: SiO added in parts by mass₂1-3 parts of sulfur-containing substance (S)₈，Na₂S，K₂S or CaS) accounts for 10-30 parts; the calcination temperature is 500-1000 ℃; the aeration rate of Ar is 0.1-10L/min.

Technical Field

The invention belongs to the technical field of preparation of nano functional materials, and particularly relates to SiO activated by sulfur-containing substances₂A preparation method of a lithium battery negative electrode material.

Background

Silicon dioxide (SiO)₂) Has higher specific capacity (1800 mA h g)^-1) The lithium ion battery cathode material has the advantages of rich resources, low working voltage, low cost and the like, and is considered to have a good development prospect. However, the conductivity of this material is very low and the material has a large volume expansion (-180%) during charging and discharging.

The activation of the electrode material is an effective way for improving the specific capacity, reducing the lithium ion migration potential barrier, improving the conductivity and inhibiting the structural deformation.

Disclosure of Invention

The invention is mainly to use sulfur-containing substances to oxidize SiO₂Activation is performed to obtain a negative electrode material having excellent lithium ion storage properties.

Sulfur containing species activated SiO of the present invention₂The preparation method of the lithium battery negative electrode material comprises the following steps:

(1) 1-3 parts (by mass) of SiO₂(specific surface area greater than 10 m²(ii)/g) and 10 to 30 parts by mass of a sulfur-containing substance (S)₈，Na₂S，K₂S or CaS) to obtain a mixture a.

(2) Placing the mixture A obtained in the step (1) into an Ar atmosphere furnace (the ventilation rate is 0.1-10L/min), the heating rate is 10 ℃/min, calcining is carried out for 1-10 hours at the temperature of 500-₂The lithium battery negative electrode material.

The invention has the beneficial effects that: (1) the sulfur-containing substance can effectively activate SiO₂(ii) a (2) Activated SiO₂The cathode material has high specific capacity, excellent rate capability and good cycling stability.

Detailed Description

Example 1

(1) 1 part (by mass) of SiO₂(specific surface area 50 m)²Per g) and 10 parts by mass of S₈Fully mixing to obtain SiO₂/S₈And (3) mixing.

(2) SiO obtained in the step (1)₂/S₈Placing the mixture into an Ar atmosphere furnace (the ventilation rate is 0.1L/min), the heating rate is 10 ℃/min, calcining for 2 hours at 800 ℃, and cooling the furnace to room temperature to obtain S₈Activated SiO₂And (3) a negative electrode material. The material is made into an electrode, a lithium sheet is used as a counter electrode, and the button cell is assembled. The battery is charged and discharged under the current of 5A/g, and the specific capacity of the battery is 1400 mA h g^-1(ii) a Charging and discharging 4000 times under the current of 3A/gCirculating, and the specific capacity of the catalyst is still kept to be 1200 mA h g^-1。