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Long-circulation lithium ion battery

A lithium-ion battery, long-cycle technology, applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of easy peeling off of graphite layers, degradation of lithium-ion battery cycle performance, etc., to reduce the occurrence of solvation co-embedding, inhibit Formation of Li+- solvent structure, effect of improving cycle performance

Pending Publication Date: 2022-08-02
ZHEJIANG NARADA POWER SOURCE CO LTD +2
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when natural graphite is used as an anode material for lithium-ion batteries, there is a problem that the graphite layer is easily peeled off due to solvation and co-intercalation, resulting in a decrease in the cycle performance of lithium-ion batteries.

Method used

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Examples

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Effect test

preparation example 1

[0030] Preparation Example 1, a negative electrode material, weighed D50 as 17 ± 2 microns, ratio table 2.5 ± 0.5 m 2 / g, 1kg of natural graphite with a deduction capacity of ≥360mAh / g, added to the ball mill, and then weighed 0.03kg of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (lithium superion conductor). Using small balls with a diameter of 5 mm and a ball-to-material ratio of 10:1, ball milled at a speed of 300 r / min for 2 hours to obtain natural graphite coated with fast ion conductors, and the coating thickness of the fast ion conductors is 100 nm.

preparation example 2

[0031] Preparation Example 2, a negative electrode material, weighed D50 as 17 ± 2 microns, ratio table 2.5 ± 0.5m 2 / g, 1kg of natural graphite with a deduction capacity of ≥360mAh / g, added to the ball mill, and then weighed 0.1kg of Li 7-x La 3+x Zr 2 O 12 (0.5≥x≥0.1) (garnet type ionic conductor). Using small balls with a diameter of 8 mm and a ball-to-material ratio of 15:1, ball milled at a speed of 400 r / min for 2 hours to obtain natural graphite coated with fast ion conductors, and the coating thickness of the fast ion conductors is 300 nm.

preparation example 3

[0032] Preparation Example 3, a negative electrode material, weighed D50 as 17 ± 2 microns, 2.5 ± 0.5 m from the table 2 / g, 1kg of natural graphite with a deduction capacity of ≥360mAh / g, added to the ball mill, and then weighed 0.05kg of Li 3x La 2 / 3-x TiO 3 (0.5≥x≥0.1) (perovskite lithium lanthanum titanate). Using small balls with a diameter of 5 mm and a ball-to-material ratio of 10:1, ball milled at a speed of 260 r / min for 3 hours to obtain natural graphite coated with fast ion conductors, and the coating thickness of the fast ion conductors is 150 nm.

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Abstract

The invention relates to the field of lithium batteries, in particular to a long-circulation lithium ion battery, a negative electrode material of the battery is natural graphite coated with a fast ion conductor on the surface, and directional modification is carried out by combining with a corresponding electrolyte. According to the lithium battery prepared by the invention, the solvation co-intercalation phenomenon of the natural graphite can be effectively inhibited, so that the cycle performance of the natural graphite battery is remarkably improved.

Description

technical field [0001] The present application relates to the field of lithium batteries, in particular to a long-cycle lithium ion battery. Background technique [0002] Artificial graphite is currently the mainstream lithium battery anode material due to its advantages of high gram capacity, high rate performance, high temperature resistance and long cycle life. However, artificial graphite needs to undergo long-term high-temperature graphitization treatment (the general graphitization time in the industry is 21 days), resulting in great energy consumption and environmental pollution. However, natural graphite has a higher gram capacity than artificial graphite without graphitization treatment, and has a more superior application prospect. [0003] However, when natural graphite is used as a negative electrode material for lithium-ion batteries, it has the problem of easy exfoliation of the graphite layer due to solvated co-intercalation, resulting in a decrease in the cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/133H01M4/36H01M4/62H01M10/0567H01M10/0569
CPCH01M10/0525H01M4/625H01M4/366H01M10/0569H01M10/0567H01M4/133Y02E60/10
Inventor 王盈来郭锋方玲相佳媛张欣瑞李艳红蒋勤虚黄文徐留扣
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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