Chinese Academy of Sciences

Beijing Hina Battery Technology Co., Ltd.

Xuejie Huang

Hao Wang

Hailong Yu

Zhou Jin

Hong Li

Kun Tang

Liquan Chen

Yongsheng Hu

Yaxiang Lu

Yunming Li

Mingxiang Lin

Shuyin Xu

Yuesheng Wang

Embodiments of the present disclosure are a pitch-based negative electrode material for a sodium-ion battery and related methods and applications. The method comprises: placing a pitch recursor into a muffle furnace to allow the pitch precursor to experience pre-oxidation for 2 to 6 hours at a temperature ranging from 200&#xb0; C. to 350&#xb0; C., to obtain pre-oxidized pitch; placing the pre-oxidized pitch into a high-temperature carbonization furnace, and increasing the temperature to 1300&#xb0; C. to 1600&#xb0; C. at a temperature increase speed of 0.5&#xb0; C./min to 5&#xb0; C./min, and carrying out thermal treatment on the pre-oxidized pitch in an inert atmosphere for 1 to 10 hours, to allow the pre-oxidized pitch to experience carbonization reactions, oxygen in the pre-oxidized pitch being used for breaking an ordered structure of the pitch during the carbonization of the pre-oxidized pitch, so as to form a wedge-shaped voids disordered structure.

Pitch-based negative electrode material for sodium-ion battery, and preparation method therefor and applications thereof

The invention provides a composite-coated nano-tin negative electrode material, which comprises a tin-based nanomaterial, a nano-copper layer coated on the surface of the tin-based nanomaterial and a conductive protective layer coated on the surface of the nano-copper layer. The nano-copper layer can inhibit the volume expansion of nano-tin, keep the nano-tin material from cracking, avoid direct contact between nano-tin and electrolyte to form stable SEI and increase the conductivity of the electrode. Coating a conductive layer on the surface of the nano-copper layer can effectively inhibit the oxidation of nano-copper, thus improving its electrochemical performance. The composite-coated nano-tin negative electrode material according to the invention is used as a negative electrode material of a lithium-ion battery, has excellent electrochemical performance, and has potential application prospects in portable mobile devices and electric vehicles.

Composite-coated nano-tin negative electrode material and preparation method and use thereof

This invention relates to a double layer composite-coated nano-silicon negative electrode material, and its preparation methods and use, the negative electrode material comprising: a silicon-based nanoparticle, a copper layer coated on the surface of the silicon-based nanoparticle, and a conductive protective layer coated on the surface of the copper layer. Nano-copper has superplastic ductility and conductivity, and the prior art has proved that lithium ions can penetrate nano-copper; therefore, the copper coating layer has effects of inhibiting the volume expansion of the silicon-based nanoparticle and keeping the silicon-based nanoparticle from cracking so that direct contact between the silicon-based nanoparticle and an electrolyte is effectively avoided and a stable SEI is formed, and increasing the conductivity of the electrode. The surface of the nano-copper is coated with a further conductive protective layer to effectively inhibit the oxidation of the nano-copper, thereby improving the electrochemical performance.

Double layer-coated nano-silicon negative electrode material, a method for preparing the same and use thereof

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Beijing, China

Xuejie Huang