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Aqueous lithium ion battery li y ti 2-x m x (po 4 ) 3 /c negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as short cycle life, achieve improved cycle performance, increase specific energy density, and achieve the effect of working voltage

Active Publication Date: 2017-01-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite nanomaterial prepared by this method has excellent electrochemical properties, which solves the problem of short cycle life of such materials in the prior art

Method used

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  • Aqueous lithium ion battery li <sub>y</sub> ti <sub>2-x</sub> m <sub>x</sub> (po <sub>4</sub> ) <sub>3</sub> /c negative electrode material and preparation method thereof
  • Aqueous lithium ion battery li <sub>y</sub> ti <sub>2-x</sub> m <sub>x</sub> (po <sub>4</sub> ) <sub>3</sub> /c negative electrode material and preparation method thereof
  • Aqueous lithium ion battery li <sub>y</sub> ti <sub>2-x</sub> m <sub>x</sub> (po <sub>4</sub> ) <sub>3</sub> /c negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 0.1g of phenolic resin, 3.3494g of n-butyl titanate and 0.5168g of lithium acetate in 30ml of ethanol (referred to as solution a), and dissolve 1.7581g of phosphoric acid in another 30ml of ethanol (referred to as solution b). Slowly drop solution b into solution a under stirring, stir and reflux at 55° for 3 hours, evaporate the solvent to dryness, and obtain a precursor. The precursors were placed in a tube furnace under Ar / H 2 Under a protective atmosphere, the temperature was raised to 700°C at a heating rate of 5°C / min, and sintered for 5 hours to obtain LiTi 2 (PO 4 ) 3 / C target material. Its XRD such as figure 1 shown. It can be seen from the figure that the target material is pure phase LiTi 2 (PO 4 ) 3 , NASICON structure, space group R3c, rhombohedral.

[0035] The prepared LiTi 2 (PO 4 ) 3 / C Active material, conductive agent Super P and binder polytetrafluoroethylene (PTFE) are mixed uniformly in a certain mass ratio (80:10:10), rolled ...

Embodiment 2

[0037] Dissolve 0.3g of phenolic resin, 3.3494g of n-butyl titanate and 0.5168g of lithium acetate in 30ml of ethanol (referred to as solution a), and dissolve 1.7581g of phosphoric acid in another 30ml of ethanol (referred to as solution b). Slowly drop solution b into solution a under stirring, reflux and stir at 55° for 3 hours, then evaporate the solvent to dryness to obtain a precursor. The precursors were placed in a tube furnace under Ar / H 2 Under a protective atmosphere, the temperature was raised to 700°C at a heating rate of 5°C / min, and sintered for 5 hours to obtain LiTi 2 (PO 4 ) 3 / C target material. Its XRD such as figure 1 . It can be seen from the figure that the target material is pure phase LiTi 2 (PO 4 ) 3 , NASICON structure, space group R3c, rhombohedral.

[0038] After preparing the pole piece and assembling the battery according to Example 1, the test was carried out. image 3 Recorded the capacity retention diagram of the battery for the firs...

Embodiment 3

[0040] Dissolve 0.5g of phenolic resin, 3.3494g of n-butyl titanate and 0.5168g of lithium acetate successively in 30ml of ethanol (referred to as solution a), and dissolve 1.7581g of phosphoric acid (purity>85%) in another 30ml of ethanol ( denoted as solution b). Slowly drop solution b into solution a under stirring, stir and reflux at 55° for 3 hours, evaporate the solvent to dryness, and obtain a precursor. The precursors were placed in a tube furnace under Ar / H 2 Under a protective atmosphere, the temperature was raised to 700°C at a heating rate of 5°C / min, and sintered for 4 hours to obtain LiTi 2 (PO 4 ) 3 / C target material. figure 1 Its XRD pattern. It can be seen from the figure that the target material is pure phase LiTi 2 (PO 4 ) 3 , NASICON structure, space group R3c, rhombohedral.

[0041] After preparing the pole piece and assembling the battery according to Example 1, the test was carried out. image 3 Recorded the capacity retention diagram of the b...

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Abstract

The invention discloses a negative electrode material of a water-system lithium ion battery LiyTi2-xMx(PO4)3 / C (wherein 0<= x <=0.4, and 0.8<= y <=1.2) and a preparation method thereof. The preparation method comprises the following steps: slowly adding a solution containing a phosphorus source into a metal ion-doped solution containing a titanium source, a lithium source and a carbon source and carrying out reflux heating; then drying a solvent through steaming; and carrying out sintering in a reducing atmosphere so as to obtain the target material. The prepared target material has a nanometer particle size and a high specific surface area, is uniformly coated by carbon and shows excellent cycle stability when used as a negative electrode of the water-system lithium ion battery. The preparation method has the advantages of short process flow, simple operation and easy realization of industrial production.

Description

technical field [0001] The invention belongs to the technical field of high-energy battery materials, and in particular relates to a lithium titanium phosphate negative electrode material for high-performance water-based lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have good application prospects in the field of energy storage and power batteries. Traditional lithium-ion batteries use flammable organic electrolytes, which not only have harsh assembly conditions, but also have safety hazards such as fire and explosion, and also have certain pollution to the environment. Therefore, solving the safety problem of lithium-ion batteries in essence and greatly reducing the production cost of batteries will be beneficial to the sustainable development of the energy and environment of the whole society. Aqueous lithium-ion batteries use lithium salt solution instead of organic electrolyte, which essentially solves the sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 王海燕孙旦刘平唐有根姜一帆蒋介草刘洪涛
Owner CENT SOUTH UNIV
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