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Positive electrode material, positive plate, lithium ion battery cell, lithium ion battery pack and application thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery life and safety risks, battery life and safety hazards, low voltage platform, etc., to improve low-temperature performance and low temperature capacity retention rate, which is beneficial to debugging and work, and the effect of smooth charging and discharging voltage

Pending Publication Date: 2022-07-08
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution has the following disadvantages: the discharge platforms of lithium iron phosphate and ternary materials are about 3.2V and 3.6V respectively, and there are obvious voltage steps during charging and discharging, which is not good for the calculation of battery capacity and power; In the process, the ternary material is discharged first, and then the lithium iron phosphate is discharged, causing each material to exceed the set discharge rate. The smaller the ratio, the greater the actual rate, which brings risks to the battery life and safety.
It mainly improves the compaction density of the material and forms a complete conductive network to reduce the polarization and internal resistance of the positive pole piece. The disadvantage is the same as the patent document CN102117913A. When discharging, the discharge platform of the ternary material and lithium iron phosphate is quite different, and the discharge exists. Sequence, coupled with differences in particle distribution in space, there is a risk of local non-uniform excessive delithiation, which brings hidden dangers to battery life and safety
[0006] In summary, there are some problems in lithium iron phosphate system batteries: (1) Low energy density, low specific capacity of lithium iron phosphate, low voltage platform, low electrical conductivity, and low compaction density, making its energy density much lower than that of ternary materials (2) The low-temperature performance is poor, and the capacity of lithium iron phosphate materials decays seriously at low temperatures; (3) There is a discharge voltage step in the conventional lithium iron phosphate mixed system, and the battery performance is seriously insufficient

Method used

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  • Positive electrode material, positive plate, lithium ion battery cell, lithium ion battery pack and application thereof
  • Positive electrode material, positive plate, lithium ion battery cell, lithium ion battery pack and application thereof
  • Positive electrode material, positive plate, lithium ion battery cell, lithium ion battery pack and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of positive electrode plate

[0040] The cathode active material lithium iron phosphate LiFePO 4 , LiNiCoMnLiNi 0.5 Co 0.2 Mn 0.3 O 2 (Narrow distribution of small particle size single crystal material, D50 is 2um, Span=0.8, tested, 3.2g / cm 3 The powder conductivity under compaction is 0.0032mS / cm, the reversible gram capacity is 171mAh / g) and the conductive agent super-P, CNT, and the binder PVDF are mixed uniformly in a mass ratio of 70:26.8:1.5:0.5:1.2. N-methylpyrrolidone (NMP) is uniformly stirred and mixed by a vacuum mixer to obtain a positive electrode active material slurry. The above slurry is uniformly coated on both sides of the current collector of aluminum foil (thickness 13 μm), dried, cold pressed and slit to obtain a positive electrode piece.

[0041] (2) Preparation of negative pole piece

[0042] The negative electrode active material graphite, conductive carbon black (super-P), sodium carboxymethyl cellulose (CMC), and styrene-...

Embodiment 2

[0048] The cathode active material lithium iron phosphate LiFePO 4 , High impedance ternary material LiNi with Al doping content of 3% 0.6 Co 0.2 Mn 0.2 O 2 (D50 is 5um, Span=0.6, tested, 3.2g / cm 3 The powder conductivity under compaction is 0.0022mS / cm, the reversible gram capacity is 178mAh / g) and the conductive agent super-P, CNT, and the binder PVDF are mixed uniformly in a mass ratio of 60:38:0.5:0.5:1.0, and added N-methylpyrrolidone (NMP) is uniformly stirred and mixed by a vacuum mixer to obtain a positive electrode active material slurry. The above slurry is uniformly coated on both sides of the current collector of aluminum foil (thickness 13 μm), dried, cold pressed and slit to obtain a positive electrode piece. The remaining steps were carried out as in Example 1.

Embodiment 3

[0050] The cathode active material lithium iron phosphate LiFePO 4 , high impedance cobalt-free material LiNi 0.75 Mn 0.25 O 2 (D50 is 4.5um, Span=0.7, tested, 3.2g / cm 3 The powder conductivity under compaction is 0.0034mS / cm, the reversible gram capacity is 185mAh / g) and the conductive agent super-P, CNT, and the binder PVDF are mixed uniformly in a mass ratio of 90:8:0.5:0.5:1.0, and added N-methylpyrrolidone (NMP) is uniformly stirred and mixed by a vacuum mixer to obtain a positive electrode active material slurry. The above slurry is uniformly coated on both sides of the current collector of aluminum foil (thickness 13 μm), dried, cold pressed and slit to obtain a positive electrode piece. The remaining steps were carried out as in Example 1.

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Abstract

The invention discloses a positive electrode material, a positive plate, a lithium ion battery cell, a lithium ion battery pack and application of the positive electrode material, the positive electrode material comprises a main positive electrode material lithium iron phosphate and at least one doped positive electrode material which is mixed with the lithium iron phosphate and has the characteristics of high impedance and high capacity, and the characteristics of high impedance and high capacity are as follows: when the compaction density of the doped positive electrode material is 3.2 g / cm < 3 >, the conductivity is less than 0.005 S / cm, and the reversible gram capacity is greater than 165 mAh / g. The lithium ion battery cell prepared from the positive electrode material has high energy density, good low-temperature performance and no discharge voltage step.

Description

technical field [0001] The invention relates to the field of energy storage devices, in particular to a positive electrode material, a positive electrode sheet, a lithium ion battery core, a lithium ion battery pack and applications thereof. Background technique [0002] In recent years, under the guidance of energy conservation and emission reduction policies and government subsidies, new energy vehicles have achieved rapid development. In 2018, the national sales of new energy vehicles reached 1.256 million. In 2019, there was a slight correction, but the sales of new energy vehicles still exceeded 1.2 million vehicles. With the enhancement of environmental awareness and the country's strong support for the new energy vehicle industry, it is expected that new energy vehicles will usher in rapid development from 2023 to 2025. However, there are still some problems in new energy vehicles, which have affected the progress of the industry, mainly because the safety, life and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/505H01M4/525H01M4/62H01M4/131H01M4/136H01M10/0525
CPCH01M4/364H01M4/5825H01M4/505H01M4/525H01M4/136H01M4/131H01M4/625H01M4/622H01M10/0525H01M2004/028Y02E60/10
Inventor 袁长福周德华唐道平李进梅骜黄东海葛志强
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD
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