Negative electrode materials of silicon-liquid metal composite lithium battery and preparation method

Abstract

The invention provides negative electrode materials of a silicon-liquid metal composite lithium battery and a preparation method. The negative electrode materials of the silicon-liquid metal composite lithium battery comprise 95 to 98 parts of silicon-based materials and 2 to 5 parts of liquid metals in parts by weight. According to the negative electrode materials of the silicon-liquid metal composite lithium battery provided by the invention, the high-temperature volume micro-variation of the liquid metals is used to buffer the stress changes induced by volume deformation of the silicon based materials, which effectively restrain the volume expansion of the silicon based materials; and besides, the liquid metals can effectively stabilize an interface between an electrode material and electrolyte, stabilize the growth of an SEI membrane, and improve the energy density of the battery and the stability of the electrolyte.

Description

technical field

[0001] The invention relates to the field of lithium ion battery negative electrode materials, in particular to a silicon-liquid metal composite lithium battery negative electrode material and a preparation method thereof. Background technique

[0002] With the rapid development of modern industry, human's demand for energy is increasing day by day. At present, 85% of the energy used in the world comes from fossil raw materials (coal, oil, natural gas, etc.), these raw materials are non-renewable, and the environmental pollution caused by them is also increasing. Therefore, the research and development of green energy and its materials is of great significance for realizing the sustainable development strategy in the 21st century, alleviating the energy crisis and reducing the pressure of environmental pollution. With the increasingly serious environmental pollution and the enhancement of people's awareness of environmental protection, the use of toxic metal...

Examples

Embodiment 1

[0020] A preparation method of a silicon-liquid metal composite lithium battery negative electrode material, comprising the following steps:

[0021] (1) Weigh 95 parts by weight of nano-silicon wires and 3 parts by weight of liquid metal bismuth tin;

[0022] (2) Under vacuum conditions, raise the temperature of the liquid metal to 80-100°C, keep it warm for 10-20 minutes, then add 1.2 parts by weight of rosin, and keep it warm for 50 minutes to obtain a modified liquid metal;

[0023] (3) Add nano-silicon wires to the modified liquid metal obtained in step (2), and homogenize it through a homogenizer at 150-200°C, so that the liquid metal and silicon-based materials are wound and compounded to obtain a silicon-liquid metal composite Lithium battery anode material.

[0024] The negative electrode material of the silicon-liquid metal composite lithium battery obtained in the embodiment was used as the negative electrode of the lithium battery, and the charging and discharging...

Embodiment 2

[0026] A preparation method of a silicon-liquid metal composite lithium battery negative electrode material, comprising the following steps:

[0027] (1) Weigh 98 parts by weight of nano-silicon wires and 5 parts by weight of liquid metal bismuth indium;

[0028] (2) Under vacuum conditions, raise the temperature of the liquid metal to 80-100°C, keep it warm for 10-20 minutes, then add 2.5 parts by weight of rosin, and keep it warm for 30 minutes to obtain a modified liquid metal;

[0029] (3) Add nano-silicon wires to the modified liquid metal obtained in step (2), and homogenize it through a homogenizer at 150-200°C, so that the liquid metal and silicon-based materials are wound and compounded to obtain a silicon-liquid metal composite Lithium battery anode material.

[0030] The negative electrode material of the silicon-liquid metal composite lithium battery obtained in the embodiment was used as the negative electrode of the lithium battery, and the charging and dischargin...

Embodiment 3

[0032] A preparation method of a silicon-liquid metal composite lithium battery negative electrode material, comprising the following steps:

[0033] (1) Weighing 96 parts by weight of nano-silicon wires and 4 parts by weight of liquid metal bismuth indium zinc;

[0034] (2) Under vacuum conditions, raise the temperature of the liquid metal to 80-100°C, keep it warm for 10-20 minutes, then add 1 weight part of rosin, keep it warm for 50 minutes, and obtain the modified liquid metal;

[0035] (3) Add nano-silicon wires to the modified liquid metal obtained in step (2), and homogenize it through a homogenizer at 150-200°C, so that the liquid metal and silicon-based materials are wound and compounded to obtain a silicon-liquid metal composite Lithium battery anode material.

[0036] The negative electrode material of the silicon-liquid metal composite lithium battery obtained in the embodiment was used as the negative electrode of the lithium battery, and the charging and discha...

technical field

[0001] The invention relates to the field of lithium ion battery negative electrode materials, in particular to a silicon-liquid metal composite lithium battery negative electrode material and a preparation method thereof. Background technique

[0002] With the rapid development of modern industry, human's demand for energy is increasing day by day. At present, 85% of the energy used in the world comes from fossil raw materials (coal, oil, natural gas, etc.), these raw materials are non-renewable, and the environmental pollution caused by them is also increasing. Therefore, the research and development of green energy and its materials is of great significance for realizing the sustainable development strategy in the 21st century, alleviating the energy crisis and reducing the pressure of environmental pollution. With the increasingly serious environmental pollution and the enhancement of people's awareness of environmental protection, the use of toxic metal...

Examples

Embodiment 1

[0020] A preparation method of a silicon-liquid metal composite lithium battery negative electrode material, comprising the following steps:

[0021] (1) Weigh 95 parts by weight of nano-silicon wires and 3 parts by weight of liquid metal bismuth tin;

[0022] (2) Under vacuum conditions, raise the temperature of the liquid metal to 80-100°C, keep it warm for 10-20 minutes, then add 1.2 parts by weight of rosin, and keep it warm for 50 minutes to obtain a modified liquid metal;

[0023] (3) Add nano-silicon wires to the modified liquid metal obtained in step (2), and homogenize it through a homogenizer at 150-200°C, so that the liquid metal and silicon-based materials are wound and compounded to obtain a silicon-liquid metal composite Lithium battery anode material.

[0024] The negative electrode material of the silicon-liquid metal composite lithium battery obtained in the embodiment was used as the negative electrode of the lithium battery, and the charging and discharging...

Embodiment 2

[0026] A preparation method of a silicon-liquid metal composite lithium battery negative electrode material, comprising the following steps:

[0027] (1) Weigh 98 parts by weight of nano-silicon wires and 5 parts by weight of liquid metal bismuth indium;

[0028] (2) Under vacuum conditions, raise the temperature of the liquid metal to 80-100°C, keep it warm for 10-20 minutes, then add 2.5 parts by weight of rosin, and keep it warm for 30 minutes to obtain a modified liquid metal;

[0029] (3) Add nano-silicon wires to the modified liquid metal obtained in step (2), and homogenize it through a homogenizer at 150-200°C, so that the liquid metal and silicon-based materials are wound and compounded to obtain a silicon-liquid metal composite Lithium battery anode material.

[0030] The negative electrode material of the silicon-liquid metal composite lithium battery obtained in the embodiment was used as the negative electrode of the lithium battery, and the charging and dischargin...

Embodiment 3

[0032] A preparation method of a silicon-liquid metal composite lithium battery negative electrode material, comprising the following steps:

[0033] (1) Weighing 96 parts by weight of nano-silicon wires and 4 parts by weight of liquid metal bismuth indium zinc;

[0034] (2) Under vacuum conditions, raise the temperature of the liquid metal to 80-100°C, keep it warm for 10-20 minutes, then add 1 weight part of rosin, keep it warm for 50 minutes, and obtain the modified liquid metal;

[0035] (3) Add nano-silicon wires to the modified liquid metal obtained in step (2), and homogenize it through a homogenizer at 150-200°C, so that the liquid metal and silicon-based materials are wound and compounded to obtain a silicon-liquid metal composite Lithium battery anode material.

[0036] The negative electrode material of the silicon-liquid metal composite lithium battery obtained in the embodiment was used as the negative electrode of the lithium battery, and the charging and discha...