Preparation method of graphene modified lithium iron phosphate and lithium iron phosphate battery

A technology of lithium iron phosphate battery and lithium iron phosphate, which is applied in the direction of secondary battery, battery electrode, active material electrode, etc., can solve the problems of poor ion conductivity and electronic conductivity, etc., to reduce the internal resistance of the battery, improve the poor conductivity, The effect of increasing the magnification

Active Publication Date: 2022-03-01
成都特隆美储能技术有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0005] The main purpose of the present invention is to provide the preparation method of graphene modified lithium iron phosphate and lithium iron phosphate battery, utilize graphene and Li 7 La 3 Zr 2 o 12 (LLZO) modified lithium iron phosphate material improves the shortcomings of poor electronic conductivity and poor ion conductivity of lithium iron phosphate material, improves the charge and discharge capacity of the material under high current, reduces the internal resistance of the battery, and improves the battery rate and cycle Performance, which can meet the market's development needs for high-energy and high-power lithium-ion batteries

Method used

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  • Preparation method of graphene modified lithium iron phosphate and lithium iron phosphate battery
  • Preparation method of graphene modified lithium iron phosphate and lithium iron phosphate battery
  • Preparation method of graphene modified lithium iron phosphate and lithium iron phosphate battery

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Embodiment 1

[0038] Embodiment 1, the preparation method of lithium iron phosphate, concrete process comprises the following steps:

[0039] S1, prepare a graphene oxide solution with a concentration of 1g / L, and ultrasonically disperse it for 1h, labeled as GO solution;

[0040] S2, take 3.29L of the GO solution prepared above, and add 1.5mol of citric acid and 0.2mol of sucrose, after fully dissolved, slowly add 1mol of FeCl 2 4H 2 O (analytically pure), ultrasonically dispersed, mixed evenly, and recorded as A liquid;

[0041] S3, add 1mol NH to solution A 4 h 2 PO 4 (analytical pure) and 1.1mol LiCl (analytical pure), fully stirred and mixed to form a uniformly dispersed mixed solution, which was marked as the mother liquor.

[0042] S4, add Li to the mother liquor 7 La 3 Zr 2 o 12 (LLZO) lithium ion good conductor coating agent, the formula is: 0.403g La(NO 3 ) 3 ·6H 2 O (analytically pure) and 0.230g ZrO(NO 3 )2·H 2 O (analytically pure), stir in a water bath at 80°C fo...

Embodiment 2

[0067] Embodiment 2, the preparation method of lithium iron phosphate, concrete process comprises the following steps:

[0068] S1, prepare a graphene oxide solution with a concentration of 1g / L, and ultrasonically disperse it for 1h, labeled as GO solution;

[0069] S2, take 3.25L of the GO solution prepared above, and add 1.5mol of citric acid and 0.2mol of sucrose, after fully dissolved, slowly add 1mol of FeCl 2 4H 2 O (analytically pure), ultrasonically dispersed, mixed evenly, and recorded as A liquid;

[0070] S3, add 1mol NH to solution A 4 h 2 PO 4 (analytical pure) and 1.1mol LiCl (analytical pure), fully stirred and mixed to form a uniformly dispersed mixed solution, which was marked as the mother liquor.

[0071] S4, add Li to the mother liquor 7 La 3 Zr 2 o 12 (LLZO) lithium ion good conductor coating agent, the formula is: 0.403g La(NO 3 ) 3 ·6H 2 O (analytically pure) and 0.230g ZrO(NO 3 )2·H 2 O (analytically pure), stir in a water bath at 80°C fo...

Embodiment 3

[0097] Embodiment 3, the preparation method of lithium iron phosphate, specific process comprises the following steps:

[0098] S1, prepare a graphene oxide solution with a concentration of 1g / L, and ultrasonically disperse it for 1h, labeled as GO solution;

[0099] S2, take 1.64L of the GO solution prepared above, and add 1.5mol of citric acid and 0.2mol of sucrose, after fully dissolved, slowly add 1mol of FeCl 2 4H 2 O (analytically pure), ultrasonically dispersed, mixed evenly, and recorded as A liquid;

[0100] S3, add 1mol NH to solution A 4 h 2 PO 4 (analytical pure) and 1.1mol LiCl (analytical pure), fully stirred and mixed to form a uniformly dispersed mixed solution, which was marked as the mother liquor.

[0101] S4, add Li to the mother liquor 7 La 3 Zr 2 o 12 (LLZO) lithium ion good conductor coating agent, the formula is: 0.403g La(NO 3 ) 3 ·6H 2 O (analytically pure) and 0.230g ZrO(NO 3 )2·H 2 O (analytically pure), stir in a water bath at 80°C fo...

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Abstract

The invention discloses a preparation method of graphene modified lithium iron phosphate and a lithium iron phosphate battery, the lithium iron phosphate prepared by utilizing the preparation method of the lithium iron phosphate is modified by graphene and Li7La3Zr2O12 (LLZO), and a battery cell of the lithium iron phosphate battery is prepared by sequentially stacking and winding a positive plate, a first diaphragm, a negative plate and a second diaphragm according to a Z shape, the positive plate is made of positive slurry and carbon-coated aluminum foil, and the negative plate is made of negative slurry and carbon-coated copper foil; according to the invention, graphene and Li7La3Zr2O12 (LLZO) are utilized, so that the defects of poor electronic conductivity and poor ionic conductivity of a lithium iron phosphate material are improved, the charge-discharge capacity of the material under high current is improved, the internal resistance of the battery is reduced, the rate capability and cycle performance of the battery are improved, and the development requirements of the market on high-energy and high-power lithium ion batteries can be met.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of graphene-modified lithium iron phosphate and a lithium iron phosphate battery. Background technique [0002] Graphene is a two-dimensional lamellar crystal with a very large specific surface area and ultra-high electrical and thermal conductivity, so graphene-modified lithium iron phosphate has more advantages than traditional carbon-coated modification methods; Li 7 La 3 Zr 2 o 12 (LLZO) is a garnet-type oxide solid electrolyte, a good conductor of Li. At room temperature, the lithium ion conductivity of the cubic phase LLZO is 10-3~10-4S / cm, and the lithium ion conductivity of the tetragonal phase LLZO is 2.3 ×10-5S / cm, with good electrochemical stability and thermal stability. [0003] The intrinsic electronic conductivity of LFP materials is low (about 10-9~10-10 s / cm), and the diffusion coefficient of lithium ions is small (about 10-...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M10/0525H01M10/0583
CPCH01M4/625H01M4/628H01M4/5825H01M10/0525H01M10/0583H01M2004/028Y02E60/10Y02P70/50
Inventor 唐姚肖勇徐王彬杨晓东李新
Owner 成都特隆美储能技术有限公司
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