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Positive electrode, positive electrode slurry, preparation method and lithium ion battery

A positive electrode slurry and positive electrode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of improving cycle performance, improving slurry discoloration and slurry gelation

Pending Publication Date: 2022-07-08
SHENZHEN DYNANONIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above method needs to be further improved to improve the effect of manganese dissolution. At the same time, it is of great research significance to further seek a simple method to reduce manganese dissolution and better adapt to the needs of the industrial development of lithium-ion batteries.

Method used

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  • Positive electrode, positive electrode slurry, preparation method and lithium ion battery
  • Positive electrode, positive electrode slurry, preparation method and lithium ion battery

Examples

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preparation example Construction

[0053] The present invention does not limit the preparation method of the positive electrode material. Exemplarily, the preparation method of the positive electrode material adopted in the embodiment of the present invention includes the following steps:

[0054] Preparation of active components of positive electrode material:

[0055] (1) Take 495.61g Li 2 CO 3 , 486.67g Fe(NO 3 ) 3 , 1000g (NH 4 ) 3 PO 4 , 840.20gMn (NO 3 ) 2 , 82.70g of sucrose, and 992.36g of water were mixed uniformly to obtain a slurry, and the slurry was spray-dried in a spray dryer.

[0056] (2) The spray-dried samples were placed in a tube furnace under nitrogen atmosphere, and the temperature was programmed to 500 °C for 12 h;

[0057] (3) Add 33.08g of sucrose after the first calcined sample is crushed, and roast it at 700℃ for 8h under nitrogen atmosphere, and the crushing is LiMn 0.7 Fe 0.3 PO 4 active ingredient.

[0058] It should be understood by those skilled in the art that the a...

Embodiment 1

[0060] This embodiment provides a LiMn 0.7 Fe 0.3 PO 4 positive electrode, by using the LiMn 0.7 Fe 0.3 PO 4 The cycle performance of the battery prepared from the positive electrode is improved, the LiMn 0.7 Fe 0.3 PO 4 The positive electrode comprises a current collector and a positive electrode material layer disposed on one side surface of the current collector, a complexing agent is dispersed in the inside and the surface of the positive electrode material layer, the current collector is an aluminum foil, and the complexing agent is EDTA, with LiMn 0.7 Fe 0.3 PO 4 The mass is 100%, and the content of EDTA is 0.15%.

[0061] The LiMn 0.7 Fe 0.3 PO 4 The preparation method of the positive electrode comprises the following steps:

[0062] 800g positive active component LiMn 0.7 Fe 0.3 PO 4 , 1.20g of ethylenediaminetetraacetic acid (EDTA), 100g of conductive agent acetylene black, 100g of binder polyvinylidene fluoride (PVDF), added to 800g of N-methylpyrrol...

Embodiment 2

[0066] The difference between this example and Example 1 is that the amount of EDTA added is adjusted so that LiMn 0.7 Fe 0.3 PO 4 In the positive electrode, the content of EDTA was 0.01%.

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Abstract

The invention discloses a positive electrode, a preparation method thereof and a lithium ion battery. The positive electrode comprises a current collector and a positive electrode material layer arranged on the surface of at least one side of the current collector, a positive electrode material in the positive electrode material layer comprises a manganese-containing positive electrode material, and a complexing agent is arranged in the positive electrode material layer and / or on the surface of one side far away from the current collector. According to the positive electrode disclosed by the invention, the complexing agent is arranged in the positive electrode material layer and / or on the surface of one side, far away from the current collector, of the positive electrode material layer, so that the battery prepared from the positive electrode material layer can effectively capture dissolved manganese ions in a charging and discharging process, and the cycle performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a positive electrode, a positive electrode slurry, a preparation method and a lithium ion battery. Background technique [0002] In the face of global problems such as environmental pollution and energy crisis, the research and development of new energy has received increasing attention and attention. At present, lithium-ion batteries have been widely used in many fields such as computers, mobile phones, and electric vehicles due to their high energy density, high power density, and long cycle life. Among them, lithium iron phosphate has the advantages of high voltage platform, outstanding safety and environmental friendliness, and is considered to be one of the most potential battery materials. Lithium manganese iron phosphate (LMFP) has a higher energy density than lithium manganese iron phosphate, but has low electrical conductivity, slightly poor rate c...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/62H01M4/1397H01M10/0525
CPCH01M4/136H01M4/62H01M4/1397H01M10/0525H01M2004/028Y02P70/50
Inventor 徐荣益李亨利孔令涌李意能
Owner SHENZHEN DYNANONIC
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