Preparation method of soft/hard carbon modified anode material for lithium ion batteries

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as large irreversible capacity, hinder negative electrode materials, and reduce efficiency, and achieve improved discharge efficiency and cycle stability, excellent rate. performance and low temperature performance, the effect of increasing tap density

Inactive Publication Date: 2018-03-27
SHENZHEN SINUO INDAL DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some scholars have used air oxidation to modify natural graphite, and found that after air oxidation modification, the charge and discharge capacity increased, but the first efficiency decreased.
[0004] At the 7th International Lithium Battery Conference, the research on the core-shell structure carbon material was reported for the first time. This kind of composite type uses natural graphite spherical mesophase graphite and polyhedral artificial graphite as the core material and amorphous carbon as the shell layer. The material has both the advantages of coke and graphite, can be well compatible with the electrolyte containing PC, has a high specific capacity, and the coulombic efficiency of the first charge and discharge is more than 85%, but there is no further improvement on the cycle performance. study
Although hard carbon materials have the characteristics of high specific capacity

Method used

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  • Preparation method of soft/hard carbon modified anode material for lithium ion batteries
  • Preparation method of soft/hard carbon modified anode material for lithium ion batteries
  • Preparation method of soft/hard carbon modified anode material for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using natural graphite fine powder as raw material (average particle size D50 is 4.65μm), petroleum pitch (softening point: 100°C) as soft carbon precursor, phenolic resin as hard carbon precursor (softening point: 110°C), the quality of the three The ratio is 10:3:3 respectively, and they are added to the reactor for stirring, the temperature is 320°C, the stirring time is 6 hours, and then cooled.

[0033] The powder obtained after cooling is sieved through a 200-mesh sieve, and the large particles on the sieve are crushed, and the powder obtained after crushing is sieved again, and then the powder under the sieve is stirred and mixed for high-temperature graphitization .

[0034] The powder obtained after graphitization is sieved through a 200-mesh sieve, the under-sieved powder is taken, and a small amount of large particles on the sieve are crushed and returned as graphite raw materials for recycling.

[0035] According to the molar ratio Ti:Si:C=2.5:2:800, weigh ...

Embodiment 2

[0038] Natural graphite fine powder is used as raw material (average particle size D50 is 6.25μm), coal tar pitch (softening point is 150°C) is soft carbon precursor, epoxy resin is hard carbon precursor (softening point is 100°C), the three The mass ratio is 10:4:4, respectively, and they are added to the reactor for stirring at a temperature of 450°C, and the stirring time is 7 hours, and then cooled.

[0039] The powder obtained after cooling is sieved through a 250-mesh sieve, and the large particles on the sieve are crushed, and the powder obtained after crushing is sieved again, and then the powder under the sieve is stirred and mixed for high-temperature graphitization .

[0040] The powder obtained after graphitization is sieved through a 200-mesh sieve, the under-sieved powder is taken, and a small amount of large particles on the sieve are crushed and returned as graphite raw materials for recycling.

[0041] According to the molar ratio Ti:Si:C=3:2:1000, take ethyl...

Embodiment 3

[0044] Artificial graphite fine powder is used as raw material (average particle diameter D50 is 5.96 μm), petroleum pitch (softening point is 250°C) is used as organic carbon source, furan resin is hard carbon precursor (softening point is 90°C), the mass ratio of the three The ratio is 10:5:5, respectively, and they are added to the reactor for stirring, the temperature is 500°C, the stirring time is 8 hours, and then cooled.

[0045] The powder obtained after cooling is sieved through a 200-mesh sieve, and the large particles on the sieve are crushed, and the powder obtained after crushing is sieved again, and then the powder under the sieve is stirred and mixed for high-temperature graphitization .

[0046] The powder obtained after graphitization is sieved through a 200-mesh sieve, the under-sieved powder is taken, and a small amount of large particles on the sieve are crushed and returned as graphite raw materials for recycling.

[0047] According to the molar ratio Ti:...

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Abstract

The invention discloses a preparation method of a soft/hard carbon modified anode material for lithium ion batteries. The method comprises the following steps: (1) carrying out mixed granulation; (2)screening and crushing; (3) mixing; (4) treating at high temperature; (5) screening; (6) modifying; (7) carrying out secondary carbonization. The method is characterized in that a soft carbon precursor and a hard carbon precursor are both used as binding agents, kneading and granulating are carried out at a certain temperature and under other conditions, small graphite particles are polymerized soas to enable the internal structure to be further densified and increase the volume density, high-temperature graphitization is then performed, and asphalt and resin are converted to pyrolytic carbon, so that a soft/hard carbon graphite composite systems is formed; the surface of the modified soft/hard carbon composite anode material is evenly coated with a layer of Ti3SiC2, having good electrical conductivity and stable chemical properties, and a conductive network, so that the improvement of the discharge capacity, discharge efficiency and cycling stability of the graphite anode material isbetter promoted.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing soft and hard carbon modified negative electrode materials for lithium ion batteries. Background technique [0002] Graphite materials have a lower charging and discharging platform and high lithium intercalation capacity. The theoretical lithium intercalation capacity of the lithium intercalation compound LiC6 is 372mAh / g, and the first charge and discharge efficiency is high. It has been found through research that during the first cycle of graphite, due to the reaction with the electrolyte to form an SEI film, this film allows lithium ions to pass through freely and prevents solvated lithium ions from entering, so the SEI film formed on the graphite surface It can prevent the graphite electrode from being further corroded by the electrolyte and maintain good cycle performance. However, the formation of the SEI film inevitably leads to a large ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 鲍海友杨建锋田东李丹枫胡文良汪烨森
Owner SHENZHEN SINUO INDAL DEV
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