Si@C composite anode material and preparation method thereof

A negative electrode material, silicon-carbon composite technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor conductivity and high expansion rate, so as to facilitate absorption and storage, improve circulation, and increase lithium ion production capacity. The effect of conductivity

Active Publication Date: 2018-06-08
内蒙古欣源石墨烯科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A silicon-carbon composite negative electrode material and a preparation method thereof of the present invention solve the problems of high expansion rate and poor electrical conductivity of the current silicon-carbon negative electrode materials, and have the advantages of high gram capacity, good cycle performance and good rate performance

Method used

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  • Si@C composite anode material and preparation method thereof
  • Si@C composite anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Step ①Lithium metaaluminate solution configuration:

[0016] Weigh 5g of lithium metaaluminate, 5g of graphene, and 15g of polyvinylidene fluoride, add them to 150ml of N-methylpyrrolidone, stir evenly, and disperse for 3 hours through a high-speed disperser to finally obtain a lithium metaaluminate solution.

[0017] Step ② Spherical SiO 2 Precursor preparation:

[0018] Under magnetic stirring, add 100ml ethanol, 6mL H 2 O, 0.6mL NH 3 •H 2 Slowly add 3mL tetraethylorthosilicate (TEOS) dropwise to the mixed liquid of O, stir for 5h, centrifuge, wash and dry for later use to obtain spherical SiO 2 The precursor is spherical silica powder. 

[0019] Step ③ SiO 2 Preparation of @C balls:

[0020] 0.6g of spherical SiO 2 The precursor was evenly mixed with 0.1 g of polyvinylidene fluoride PVDF powder and dispersed in 6 mL of N-methylpyrrolidone (NMP), then dried in an oven at 120 °C for 2 h under vacuum, and then the dried sample was placed in a tube furnace , ...

Embodiment 2

[0024] Step ① Lithium metaaluminate configuration:

[0025] Weigh 1 g of lithium metaaluminate, 1 g of graphene, and 10 g of polyvinylidene fluoride, add them to 100 ml of N-methylpyrrolidone, and disperse uniformly at high speed for 3 hours to obtain a lithium metaaluminate solution.

[0026] Step ② Spherical SiO 2 Precursor preparation:

[0027] Under magnetic stirring, add 100ml ethanol, 6mL H 2 O, 0.6mL NH 3 •H 2 Slowly add 1.0mL tetraethyl orthosilicate (TEOS) dropwise to the mixed liquid of O, stir for 5h, centrifuge, wash and dry for later use to obtain spherical SiO 2 The precursor is spherical silica powder. 

[0028] Step ③ SiO 2 Preparation of @C balls:

[0029] 0.2 g of spherical SiO 2 The precursor was evenly mixed with 0.05 g of polyvinylidene fluoride PVDF powder and dispersed in 6 mL of N-methylpyrrolidone (NMP), then vacuum-dried in an oven at 120 °C for 2 h, and then the dried sample was placed in a tube furnace , and calcined at 400°C for 3h unde...

Embodiment 3

[0033] Step ① Preparation of lithium metaaluminate solution: Weigh 10 g of lithium metaaluminate, 10 g of graphene, and 20 g of polyvinylidene fluoride, add them to 200 ml of N-methylpyrrolidone, and disperse uniformly at high speed for 3 hours to obtain a lithium metaaluminate solution.

[0034] Step ② Spherical SiO 2 Precursor preparation:

[0035] Under magnetic stirring, add 100ml ethanol, 6mL H 2 O, 0.6mL NH 3 •H 2 Slowly add 5mL tetraethylorthosilicate (TEOS) dropwise to the mixed liquid of O, stir for 5h, centrifuge, wash and dry for later use to obtain spherical SiO 2 The precursor is spherical silica powder. 

[0036] Step ③ SiO 2 Preparation of @C balls:

[0037] 0.8 g of spherical SiO 2 The precursor was mixed evenly with 0.2g of polyvinylidene fluoride PVDF powder and dispersed in 6mL of N-methylpyrrolidone (NMP), then vacuum-dried in an oven at 120°C for 2h, and then the dried sample was placed in a tube furnace , and calcined at 600°C for 3h under a ni...

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Abstract

The invention discloses a Si@C composite anode material and a preparation method thereof and particularly relates to the field of anode materials of lithium ion batteries. The Si@C composite anode material is characterized by consisting of a core, a middle layer and an outer layer and adopting a core-shell structure; the core is a porous spherical Si@C material, the middle layer is a lithium metaaluminate mixed material, and the outer layer is a carbon layer; the lithium metaaluminate mixed material is formed by mixing lithium metaaluminate, graphene, a binder and a solvent; the binder is polyvinylidene fluoride and the solvent is N-methylpyrrolidone. The Si@C composite anode material solves the problems of high expansion rate, poor electrical conductivity and the like of existing Si@C composite anode materials and has the advantages of high gram volume, good cycle performance and excellent rate performance.

Description

technical field [0001] The invention relates to the field of battery material preparation, in particular to the field of negative electrode materials for lithium ion batteries. . Background technique [0002] Graphite negative electrode material is the key material for lithium-ion batteries, and has become the first choice for negative electrode materials due to its good cycle performance, strong stability, low price, and high compatibility with electrolytes. Parameters such as capacity and rate performance can no longer meet the requirements of market-oriented lithium-ion batteries for anode materials. Therefore, high-capacity anode materials have been developed to meet lithium-ion batteries with high specific energy density. [0003] The current high-capacity anode materials mainly include silicon-carbon anodes, tin-based anodes, etc., and the technology of silicon-carbon anode materials is relatively mature. Due to the large volume expansion of the current silicon-carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M4/48H01M4/46H01M10/0525
CPCH01M4/366H01M4/38H01M4/463H01M4/48H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 薛永谢志懋
Owner 内蒙古欣源石墨烯科技股份有限公司
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