Preparation method for asphalt hard carbon negative electrode material for lithium ion battery

Abstract

The invention discloses a preparation method for an asphalt hard carbon negative electrode material for a lithium ion battery, wherein the preparation method comprises the following steps: 1) making commercial sulfonated asphalt and deionized water into an asphalt solution, and filtering out undissolved asphalt particles, to obtain a clarified water-soluble asphalt solution; 2) adding a graphite micro-powder to the asphalt solution obtained in the step 1); 3) carrying out spray granulation of the graphite asphalt solution obtained in the step 2), to obtain asphalt hard carbon microspheres with the particle size of 1-51[mu]m; and 4) heating the asphalt hard carbon microspheres obtained in the step 3) up, and drying to obtain the asphalt hard carbon negative electrode material for the lithium ion battery. The used raw materials are cheap in price and wide in sources; no any organic solvent requires to be added in the whole production process; the asphalt hard carbon particle size distribution can be controlled; the preparation process easily realizes industrialized production. The prepared asphalt hard carbon negative electrode material has excellent lithium intercalation and removal capacities, and is suitable for power lithium ion batteries.

Description

technical field [0001] The invention relates to the technology in the field of lithium-ion battery materials, and in particular provides a preparation method for a pitch hard carbon negative electrode material for lithium-ion batteries. Background technique [0002] At present, the application of lithium-ion batteries in electric vehicles is a hot spot in the research of lithium-ion batteries. In order to use lithium-ion batteries in the field of electric vehicles, the conditions that need to be met are: good stability and high reversible specific capacity during high current circulation. At this stage, negative electrode materials such as graphite, hard carbon, soft carbon, and lithium titanate are the main research objects in the field of power batteries. For hard carbon, based on its stable structure, excellent rate characteristics, cycle stability, long cycle life, high safety and capacity retention, it can still be maintained at a high level under high current, and it ...

AI Technical Summary

Problems solved by technology

Among the current preparation methods, some need to add a cross-linking agent, and involve material mixing and pre-carbonization process, the process technology is cumbersome; some use hydrothermal method, high temperature and high pressure conditions, high requirements for equipment, and poor safety performance; Some need to add a catalyst, the product needs to be washed and dried, etc., and the cost is high

In addition, lithium-ion battery anode materials prepared from biomass materials are not conducive to large-scale production due to the limitations of raw material sources and cost.

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