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High-first-efficiency graphene composite silicon-carbon negative electrode material, preparation method thereof and battery

A graphene composite and negative electrode material technology, applied in the preparation/purification of carbon, secondary batteries, battery electrodes, etc., can solve the problems of high production cost, difficulty in industrial application, and complicated preparation process

Pending Publication Date: 2022-04-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of electrochemical performance, the negative electrode material can not take into account the initial efficiency and cycle performance, the main reason is that the breakage of nano-silicon particles cannot be fundamentally suppressed
At the same time, the preparation process of the material is complicated, the production cost is high, and the industrial application is difficult

Method used

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  • High-first-efficiency graphene composite silicon-carbon negative electrode material, preparation method thereof and battery
  • High-first-efficiency graphene composite silicon-carbon negative electrode material, preparation method thereof and battery
  • High-first-efficiency graphene composite silicon-carbon negative electrode material, preparation method thereof and battery

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Experimental program
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Effect test

Embodiment 1

[0045] After mixing the graphene microsheet dispersion (10%) with a solid content of 3% and carbon-coated SiOx particles (90%) in an aqueous solution, spray granulation is carried out to obtain the precursor of the target material. The precursor was annealed at 800 °C for 5 h under an Ar gas protective atmosphere. The obtained annealed powder was blended with a lithium block, the size of the lithium block was 3 mm, and the mass ratio was 1:0.1; the annealing treatment was performed at a vacuum degree of 50 Pa. The annealing temperature was 700°C, and the annealing time was 1h. The graphene-composite silicon-carbon composite anode material button battery was obtained. The initial efficiency was 82.3%, and the capacity retention rate after 100 cycles at 0.5C was 95.4%.

[0046] The SEM image of the prepared graphene-composite silicon-carbon composite anode material is as follows figure 1 As shown, the XRD pattern is as figure 2 As shown, there is a strong Li in this anode mat...

Embodiment 2

[0048] After mixing the graphene microsheet dispersion (15%) with a solid content of 3% and carbon-coated SiOx particles (85%) in an aqueous solution, spray granulation is carried out to obtain the precursor of the target material. The precursor was annealed at 800 °C for 7 h under an Ar gas protective atmosphere. The obtained annealed powder is blended with lithium blocks at a mass ratio of 1:0.2; annealing is performed at a vacuum of 50 Pa. The annealing temperature was 800°C, and the annealing time was 1h. The graphene-composite silicon-carbon composite anode material button battery was obtained. The initial efficiency was 83.4%, and the capacity retention rate after 100 cycles at 0.5C was 96.1%.

Embodiment 3

[0050] After mixing the graphene microsheet dispersion (10%) with a solid content of 3% and carbon-coated SiOx particles (90%) in an aqueous solution, spray granulation is carried out to obtain the precursor of the target material. The precursor was annealed at 600 °C for 5 h under an Ar gas protective atmosphere. The obtained annealed powder was blended with Li powder at a mass ratio of 1:0.15; annealing was performed at a vacuum of 10 Pa. The annealing temperature was 800°C, and the annealing time was 3 hours. The graphene-composite silicon-carbon composite anode material button battery was obtained. The initial efficiency was 82.5%, and the capacity retention rate after 50 cycles at 0.5C was 94.7%.

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Abstract

The invention provides a high-first-effect graphene composite silicon-carbon negative electrode material. The high-first-effect graphene composite silicon-carbon negative electrode material is formed by compounding silicon-carbon particles with core-shell structures and graphene microchips, the outer layer of the silicon-carbon particle with the core-shell structure is an inorganic carbon layer, and the interior of the silicon-carbon particle with the core-shell structure is nano silicon particles wrapped by silicate; the silicon carbon particles with the core-shell structures are compounded with the graphene nanoplatelets through the bridging effect of silicate. Wherein silicate has good lithium ion conductivity and structural stability, and the inorganic carbon coating layer improves the conductivity of the material while synergistically relieving the expansion of the material. Through the multistage coating structure of the silicate layer and the inorganic carbon layer and the bridging effect of the silicate component, the volume expansion of the nano silicon in the primary particles in the circulation process is inhibited, the damage of the volume expansion to the secondary particles in the charging and discharging process is reduced, and the negative electrode material has excellent cycle performance while having high gram capacity.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a high-first-efficiency graphene composite silicon-carbon negative electrode material, a preparation method thereof, and a battery. Background technique [0002] As an energy storage device with outstanding performance, lithium-ion batteries are widely used in new energy storage power systems, electric tools, new energy vehicles, military equipment, aerospace and other fields. People have put forward higher requirements for the energy density, rate performance, cycle performance, and high and low temperature performance of the new generation of lithium-ion batteries. In response to the development requirements of energy density, increasing the specific capacity of electrode materials is the most direct and effective method. [0003] The theoretical gram capacity of silicon-based negative electrode materials can reach 4200mAh / g, and at the same time, it has a low potent...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525C01B32/194C01B32/05C01B33/32C01B33/021B82Y30/00
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525C01B32/194C01B32/05C01B33/32C01B33/021B82Y30/00C01B2204/32C01B2204/02C01P2004/80C01P2006/40H01M2004/021H01M2004/027
Inventor 彭小强季晶晶刘兆平郎庆安马池游江枫
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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