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A lithium-ion battery with high cycle performance and rate performance

A lithium-ion battery and cycle performance technology, which is applied in the manufacture of battery electrodes, secondary batteries, and electrolyte batteries, can solve the problems of low energy density, large volume expansion rate of negative electrode materials, and rapid performance decline, so as to improve energy density, Good cycle performance, the effect of improving performance

Active Publication Date: 2021-11-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low energy density of existing lithium-ion batteries, high electrical performance can only be maintained in a narrow temperature range, and the large volume expansion rate and rapid performance degradation of negative electrode materials during use, this paper The invention provides a lithium-ion battery with high cycle performance and rate performance

Method used

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  • A lithium-ion battery with high cycle performance and rate performance
  • A lithium-ion battery with high cycle performance and rate performance
  • A lithium-ion battery with high cycle performance and rate performance

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Preparation of artificial graphite:

[0071] Mix mosaic coke and pitch at a mass ratio of 20:1 at 70 °C, heat to 390 °C for 4 h of thermal polymerization after mixing, and then treat at 410 °C for 1.5 h to remove light components, and then heat-treated at 2700 °C for 7 h to obtain artificial graphite, which was detected as fine graphite powder with a mesh number ≥ 400.

Embodiment 2

[0073] Preparation of artificial graphite:

[0074] Mix mosaic coke and pitch at a mass ratio of 10:1 at 65 °C, heat to 380 °C for 3 h of thermal polymerization after mixing, and then treat at 380 °C and vacuum -0.08 MPa for 1 h to remove light components, and then heat-treated at 2600 °C for 5 h to obtain artificial graphite, which was detected as fine graphite powder with a mesh number ≥ 400.

Embodiment 3

[0076] Preparation of artificial graphite:

[0077] Mosaic coke and pitch were mixed at a mass ratio of 30:1 at 75 °C, heated to 400 °C for 5 h for thermal polymerization after mixing, and then treated at 450 °C under a vacuum of -0.10 MPa for 2 h to remove light components, and then heat-treated at 2800 °C for 10 h to obtain artificial graphite, which was detected as fine graphite powder with a mesh number ≥ 400.

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Abstract

The invention relates to the field of designing lithium battery materials, in particular to a lithium ion battery with high cycle performance and rate performance. It includes positive electrode, negative electrode and separator; positive electrode formula includes: ternary positive electrode material, carbon nanotubes and conductive carbon black; negative electrode formula includes: negative electrode material and negative electrode conductive agent; negative electrode material is a core shell formed by amorphous carbon coated graphite Structural particles, the preparation method of which is as follows: dissolving an organic carbon source in a solvent, configuring it as an organic carbon solution, adding graphite fine powder into the organic carbon solution and dispersing it evenly to obtain a graphite dispersion, and coking the graphite dispersion at low temperature to obtain Pre-sol, add biomass carrier to the pre-sol, impregnate and absorb until the biomass carrier is saturated, then filter the biomass carrier to perform secondary thermal coking and sintering and solidification in turn, to obtain a powder-like negative electrode material. The battery of the invention has high energy density, excellent cycle performance and rate performance, and has high and low temperature resistance.

Description

technical field [0001] The invention relates to the field of designing lithium battery materials, in particular to a lithium ion battery with high cycle performance and rate performance. Background technique [0002] With the gradual strengthening of energy and environmental awareness, new energy vehicles have made great progress in recent years. Among them, electric vehicles are one of the main directions. In the power battery of electric vehicles, lithium-ion batteries occupy a very important position. [0003] At present, the negative electrode of lithium-ion power batteries on the market is mainly graphite. [0004] For example, the Chinese invention patent with the application number 201210092946.6 discloses a method for preparing a negative electrode material of a lithium ion battery. The negative electrode material of a lithium ion battery is obtained by placing a graphite carbon material in a plasma treatment device for processing. The invention also provides a ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/058H01M4/505H01M4/525H01M4/62H01M4/583H01M10/42
CPCH01M4/505H01M4/525H01M4/583H01M4/625H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 李国华杜小红励铠鸿
Owner ZHEJIANG UNIV OF TECH