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Ti3SiC2 and carbon composite modified LiFePO4 lithium ion battery anode material and preparation method thereof

A lithium ion battery, lithium iron phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor low-temperature electrochemical performance, and achieve the effect of simple process and excellent low-temperature electrochemical performance.

Inactive Publication Date: 2014-01-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is aimed at lithium ion battery cathode material LiFePO 4 The problem of poor electrochemical performance at low temperature, through titanium silicon carbon (Ti 3 SiC 2 ) and carbon (C) composite modified lithium iron phosphate (LiFePO 4 ), providing a lithium-ion battery cathode material with stable low-temperature performance

Method used

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  • Ti3SiC2 and carbon composite modified LiFePO4 lithium ion battery anode material and preparation method thereof
  • Ti3SiC2 and carbon composite modified LiFePO4 lithium ion battery anode material and preparation method thereof
  • Ti3SiC2 and carbon composite modified LiFePO4 lithium ion battery anode material and preparation method thereof

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Effect test

Embodiment 1

[0031] LiFePO prepared by carbothermal reduction method 4 / C (3.58% by mass of C) powder is used as the matrix material, using commercially available Ti 3 SiC 2 Powder as a modified substance. Disperse 4.85 grams of matrix material in 120 grams of absolute ethanol (mass concentration 3.88%), and 0.15 grams of Ti 3 SiC 2 Disperse in 40 g of absolute ethanol (mass concentration 0.37%), ultrasonically oscillate the above two suspensions for 30 minutes and then stir at room temperature for 4 hours. Under vigorous stirring, the Ti 3 SiC 2 LiFePO was added dropwise to the suspension 4 / C suspension, after the dropwise addition, continue to stir for no less than 6 hours under heating conditions not higher than 60°C until the excess ethanol evaporates to obtain a paste, and then dry it in an oven at 70°C for 12h. The resulting powder was placed in a nitrogen-hydrogen mixed atmosphere in a tube furnace (V N2 :V H2 =95:5) Heat treatment at 400°C for 2 hours, grind, and pass thr...

Embodiment 2

[0033] LiFePO prepared by carbothermal reduction method 4 / C (3.58% by mass of C) powder is used as the matrix material, using commercially available Ti 3 SiC 2 Powder as a modified substance. Disperse 4.80 grams of matrix material in 120 grams of absolute ethanol (mass concentration 3.85%), and 0.20 grams of Ti 3 SiC 2 Disperse in 40 g of absolute ethanol (mass concentration 0.50%), ultrasonically oscillate the above two suspensions for 30 minutes and then stir at room temperature for 4 hours. Under vigorous stirring, the Ti 3 SiC 2 LiFePO was added dropwise to the suspension 4 In the / C suspension, after the dropwise addition, continue to stir for no less than 6 hours under heating conditions not higher than 60°C until the excess ethanol evaporates to obtain a paste, and then dry it in an oven at 70°C for 12h. The resulting powder was placed in a nitrogen-hydrogen mixed atmosphere in a tube furnace (V N2 :V H2 =95:5) Heat treatment at 400°C for 2 hours, grind, and p...

Embodiment 3

[0035] LiFePO prepared by carbothermal reduction method 4 / C (3.58% by mass of C) powder is used as the matrix material, using commercially available Ti 3 SiC 2 Powder as modified substance. Disperse 4.80 grams of matrix material in 120 grams of absolute ethanol (mass concentration 3.85%), and 0.20 grams of Ti 3 SiC 2 Disperse in 40 g of absolute ethanol (mass concentration 0.50%), ultrasonically oscillate the above two suspensions for 30 minutes and then stir at room temperature for 4 hours. Under vigorous stirring, the Ti 3 SiC 2 LiFePO was added dropwise to the suspension 4 In the / C suspension, after the dropwise addition, continue to stir for no less than 6 hours under heating conditions not higher than 60°C until the excess ethanol evaporates to obtain a paste, and then dry it in an oven at 70°C for 12h. The resulting powder was placed in a nitrogen-hydrogen mixed atmosphere in a tube furnace (V N2 :V H2 =95:5) Heat treatment at 400°C for 2 hours, grind, and pas...

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Abstract

The invention discloses a Ti3SiC2 and carbon composite modified LiFePO4 lithium ion battery anode material and a preparation method thereof. Carbon-coated LiFePO4 powder is used as a substrate; lamellar Ti3SiC2 is added to the substrate to prepare Ti3SiC2 and carbon composite modified LiFePO4; the carbon-coated LiFePO4 powder comprises 1 to 10 mass percent of carbon; Ti3SiC2 accounts for 0.5 to 10 mass percent of the composite modified powder. Nano-particle Ti3SiC2 which is of a one-dimensional linear or two-dimensional liner structure is added into LiFePO4 particles by adopting an alcohol suspension method; a conductive network is formed by the carbon and the Ti3SiC2 together and point-line or point-surface contact is added into pure point-point contact of the contact condition of anode active particles; electrode and electrode / electrolyte interface dynamics is greatly improved, so that low-temperature electrochemical performance of a lithium ion battery is improved. The Ti3SiC2 and carbon composite modified LiFePO4 lithium ion battery anode material adopts a simple process, is low in cost, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, in particular to a titanium silicon carbon (Ti 3 SiC 2 ) and carbon (C) composite modified lithium ion battery lithium iron phosphate (LiFePO 4 ) Cathode material and preparation method thereof. Background technique [0002] With the global energy and environmental problems becoming more and more serious, lithium-ion batteries have become widely used energy storage devices at room temperature due to their high specific energy, good cycle performance, and no pollution to the environment, and can be widely used in small civilian appliances , electric vehicles and other fields. Among a series of positive electrode materials for lithium-ion batteries, lithium iron phosphate has a high theoretical capacity of 170mAh / g, a stable charge and discharge platform (3.4V), high temperature performance and thermal stability, and excellent reversible performance. Advantages bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 郭瑞松刘丽许雯雯王超
Owner TIANJIN UNIV