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A kind of submicron copper sulfide/sisal fiber carbon lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery and sisal fiber technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of preparation that have not been reported yet, and achieve the effects of low cost, improved cycle performance, and increased specific capacity

Active Publication Date: 2017-05-31
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Therefore, it can be predicted that if the composite material is constructed of sisal fiber carbon and copper sulfide, the volume expansion of the copper sulfide electrode material during the cycle can be adjusted through the pores of the sisal fiber carbon, and the copper sulfide electrode material can be avoided in the electrolyte. Therefore, the conductivity and specific capacity of the composite are greatly improved compared with the single sisal fiber carbon material. However, so far, copper sulfide / sisal fiber carbon lithium ion battery negative electrode materials and their preparation have not been reported. to report

Method used

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  • A kind of submicron copper sulfide/sisal fiber carbon lithium ion battery negative electrode material and preparation method thereof
  • A kind of submicron copper sulfide/sisal fiber carbon lithium ion battery negative electrode material and preparation method thereof
  • A kind of submicron copper sulfide/sisal fiber carbon lithium ion battery negative electrode material and preparation method thereof

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Embodiment

[0015] (1) Carbonize the sisal fiber for 0.5h in a nitrogen atmosphere with a gas flow rate of 40mL / min, the carbonization temperature is 900°C, and the heating rate is 3°C / min. After natural cooling to room temperature, the sisal fiber carbon is obtained. After mechanical ball milling at a rotating speed of 1 / min, sisal fiber carbon powder was obtained by passing through a 200-mesh sieve.

[0016] (2) Add 0.4g of copper nitrate to 76ml of deionized water, stir with a magnetic stirrer until completely dissolved, add 0.64g of sisal fiber charcoal powder prepared in step (1) under continuous stirring, and continue to add 0.48g of thiourea , sealed and continued to stir overnight, then transferred the mixed solution to a stainless steel reactor lined with polytetrafluoroethylene, controlled the filling amount of the solution in the reactor to 75%, and then placed the reactor in an oven at 180°C for 12 hours , naturally cooled to room temperature, then filtered, washed the filtrat...

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Abstract

The invention discloses a submicron copper sulfide / sisal fiber carbon lithium ion battery negative electrode material and a preparation method thereof. After the sisal fiber is carbonized, ground and sieved in a tubular atmosphere furnace, it is mixed evenly with copper nitrate and thiourea in the solution, and transferred to the reaction kettle for hydrothermal reaction, and the obtained sample is filtered, washed and dried. After drying, the negative electrode material of submicron copper sulfide / sisal fiber carbon lithium ion battery can be obtained. In this negative electrode material, copper sulfide particles with an irregular shape and a particle size of 200 to 500 nm are uniformly dispersed on the surface and pores of sisal fiber carbon with a multi-level pore structure, and the mass ratio of copper sulfide to the composite is 1: 5. The submicron copper sulfide / sisal fiber carbon lithium ion battery negative electrode material prepared by the invention has better cycle performance and rate performance.

Description

technical field [0001] The invention relates to a submicron copper sulfide / sisal fiber carbon lithium ion battery negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] The rapidly developing electronics industry and electric vehicle industry have put forward higher and higher requirements for high capacity and high rate performance of lithium-ion batteries. The electrode material is the main factor that determines the overall performance of the battery. At present, carbon anode materials are mainly used as anode materials for lithium-ion batteries. Biomass carbon material, as a kind of carbon negative electrode material, provides a short transmission path for the storage of lithium ions and the transmission of electrons due to its many natural pores inside. [0003] At present, many scholars at home and abroad have used biomass carbon materials as ano...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/58H01M10/0525
CPCH01M4/136H01M4/1397H01M4/5815H01M10/0525Y02E60/10
Inventor 覃爱苗王美苹田宁蒙均晶田长思廖雷
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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