Lithium ion battery negative electrode material

Abstract

The invention discloses a lithium ion battery negative electrode material. A preparation method of the lithium ion battery negative electrode material is characterized in that a surfactant is used for performing surface modification treatment on Si particles, so that Mg(OH)2 can easily coat the surface of nanometer Si powder; firstly, the Si particles are dissolved in a hexadecyl benzene sulfonate ammonium bromide water solution; stirring and ultrasound treatment are performed to generate mixed suspension; then, magnesium nitrate, urea and glucose are added into the suspension; stirring is performed for 3h; the completely stirred suspension is poured into a polytetrafluoroethylene reaction kettle and is then put into a homogeneous reactor; the gradient temperature is set for reaction; reaction is firstly performed for 3h at 160 DEG C; next, reaction is performed for 6h at 180 DEG C; and after the reaction completion and cooling, solid materials are washed by deionized water and are dried for 12h at 40 DEG C. The prepared composite material has the advantages that a carbon material with a high electric conductivity and a stable structure is used as a case layer; graphene is introduced, so that the collapse of the electrode material structure can be released; and the ion and electron conductivity of the material is improved to the great degree.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a lithium ion battery negative electrode material. Background technique [0002] The research on negative electrode materials plays a decisive role in lithium-ion batteries. The earliest research on lithium metal has caused serious safety problems in lithium batteries. Lithium dendrites are prone to occur during repeated cycles, piercing the diaphragm, causing short circuits, and even fire and explosion. The application of carbon materials solves the safety problem of metal lithium electrodes, but carbon materials have a low specific capacity (372mAh / g) [1] , low initial charge and discharge efficiency, organic solvent co-intercalation and other deficiencies. In recent years, people have begun to study other non-carbon anode materials with high specific capacity, such as alloys, silicon-based, transition metal oxides, and titanium-based materials. Among them, silico...

AI Technical Summary

Problems solved by technology

It can be seen that although the research on silicon-based negative electrode materials has made some progress, further research is still needed to improve the cycle performance of high specific energy power batteries.

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