Low-temperature cycle iron phosphate lithium-ion power battery and preparation method thereof

A lithium iron phosphate and power battery technology, which is applied in the field of low-temperature cycle lithium iron phosphate power battery and its preparation, can solve the problems of low battery charge and discharge capacity, increased battery polarization, and lower platform, so as to reduce internal resistance and improve Compaction density and tap density, effect of reducing layer spacing

Active Publication Date: 2018-03-06
江苏海四达电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When ordinary batteries are used for high-current charging and discharging in low-temperature environments, the polarization of the battery increases, the platform decreases, and the charging and discharging voltage reaches the charging and discharging voltage prematurely, resulting in too little charging and discharging capacity of the battery or direct discharge of electricity.

Method used

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  • Low-temperature cycle iron phosphate lithium-ion power battery and preparation method thereof
  • Low-temperature cycle iron phosphate lithium-ion power battery and preparation method thereof
  • Low-temperature cycle iron phosphate lithium-ion power battery and preparation method thereof

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preparation example Construction

[0029] The present invention also provides a method for preparing a positive electrode of a lithium battery, comprising the following steps:

[0030] 1), uniformly mixing the positive electrode active material, conductive agent and binder in a vacuum mixer to obtain the positive electrode material;

[0031] 2), uniformly mix the positive electrode material and the first part of the organic solvent to obtain the positive electrode paste 1;

[0032] 3) Mix the positive electrode paste 1 and the second part of the organic solvent evenly to obtain the positive electrode paste 2;

[0033] 4) Add the remaining organic solvent into the positive electrode paste 2, adjust the viscosity to 6000-8000mPa·s, and pass through a 100-mesh sieve to obtain the positive electrode slurry;

[0034] 5) Coating the sieved positive electrode slurry on at least one side of the positive electrode current collector, drying, rolling, slitting, and sheeting to obtain the lithium battery positive electrod...

Embodiment 1

[0087] 1. Preparation of positive electrode

[0088] 95.5kg LiFePO 4 (D50 is 1μm, tap density is 1.02g / cm3 , the specific surface area is 10m 2 / g), 1kg conductive carbon black, 1kg graphene, 2.5kg PVDF 5130 in a vacuum oven with a vacuum degree ≤ -0.08MPa, bake at 120°C for 300min;

[0089] The above LiFePO 4 , conductive carbon black, graphene, and PVDF 5130 were added to a vacuum mixer, and stirred at a speed of 25r / min for 60min to obtain the positive electrode material;

[0090] Stir the above positive electrode material and 30kg of N-methylpyrrolidone (NMP) evenly in a vacuum mixer to obtain a positive electrode slurry paste 1, wherein the stirring rate is 1800r / min, the stirring time is 90min, and the stirring temperature is 40°C;

[0091] Stir the positive electrode paste 1 and 30kg NMP in a vacuum mixer evenly to obtain the positive electrode paste 2, wherein the stirring rate is 2200r / min, the stirring time is 90min, and the stirring temperature is 40°C;

[0092]...

Embodiment 2

[0104] According to the method of Example 1, the difference is that the preparation method of the positive electrode is as follows:

[0105] 94kg LiFePO 4 (D50 is 0.6μm, tap density is 0.85g / cm 3 , the specific surface area is 8m 2 / g), 2kg conductive carbon black, 1kg graphene, 3kg PVDF 5130 in a vacuum oven with a vacuum degree ≤ -0.08MPa, bake at 120°C for 300min;

[0106] The above LiFePO 4 , conductive carbon black, graphene, and PVDF 5130 were added to the vacuum mixer, and stirred at a speed of 40r / min for 75min to obtain the positive electrode material;

[0107] Stir the above positive electrode material and 32kg of N-methylpyrrolidone (NMP) evenly in a vacuum mixer to obtain a positive electrode slurry paste 1, wherein the stirring rate is 2200r / min, the stirring time is 60min, and the stirring temperature is 30°C;

[0108] Stir the positive electrode paste 1 and 40kg NMP in a vacuum mixer evenly to obtain the positive electrode paste 2, wherein the stirring rate ...

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Abstract

The invention relates to the technical field of lithium batteries, inp articular to a low-temperature cycle iron phosphate lithium-ion power battery and a preparation method of the low-temperature cycle iron phosphate lithium-ion power battery. The low-temperature cycle iron phosphate lithium-ion power battery comprises a positive electrode, a negative electrode and an electrolyte, the positive electrode comprises lithium iron phosphate, the average particle size distribution D50 of the volume of the lithium iron phosphate is 0.5-2 [mu]m, the tap density of the lithium iron phosphate is 0.8-1.5 g/cm<3>, the specific surface area of the lithium iron phosphate is 6-12 m<2>/g, the negative electrode comprises a green coke pulverized super-high temperature graphitized material, the particle size distribution D50 of the green coke pulverized super-high temperature graphitized material is 2-10 [mu]m, the tap density of the green coke pulverized super-high temperature graphitized material is1.2-2 g/cm<3>, and the specific surface area of the green coke pulverized super-high temperature graphitized material is 0.5-1.5 m<2>/g. The positive electrode and the negative electrode are modified,so that the low-temperature cycle performance of the lithium battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a low-temperature cycle lithium iron phosphate power battery and a preparation method thereof. Background technique [0002] At present, the pure electric vehicle products sold in the domestic new energy vehicle market are becoming more and more abundant, but most of the pure electric vehicles have poor charging and discharging performance below -20°C. Nest" embarrassing question. Studies have shown that when the temperature drops from 25°C to -20°C, the power released by the car's power battery will decrease by 30%, and the charging time will increase accordingly. Therefore, in a low temperature environment, the operation of electric vehicles usually has the problem of difficulty in charging and a significant reduction in cruising range. Low-temperature performance is particularly important as an important indicator for considering the environmental applicability of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/587H01M10/0525H01M10/058
CPCH01M4/5825H01M4/587H01M10/0525H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 沈晓彦张慕蓉沙永香王兴威胡丹丹
Owner 江苏海四达电源有限公司
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