Positive lithium supplement additive, positive pole piece, preparation method of positive pole piece and lithium ion battery

A positive electrode and additive technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as potential safety hazards and adverse effects on the overall performance of the battery, and improve high voltage resistance and overcharge. capacity and cycle performance, and the effect of improving the first charge-discharge efficiency

Pending Publication Date: 2022-07-26
FARASIS TECH (GANZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cathode additives include many lithium salt additives such as metal / Li 2 O, Metal / LiF, Li 5 FeO 4 etc., such as Li 2 O reacts in the battery to produce gas, which poses a safety hazard, and Li 5 FeO 4 After the reaction, the material will remain in the positive electrode, which will adversely affect the overall performance of the battery.

Method used

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  • Positive lithium supplement additive, positive pole piece, preparation method of positive pole piece and lithium ion battery
  • Positive lithium supplement additive, positive pole piece, preparation method of positive pole piece and lithium ion battery
  • Positive lithium supplement additive, positive pole piece, preparation method of positive pole piece and lithium ion battery

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preparation example Construction

[0038]According to a third aspect of the present invention, the present invention provides a method for preparing a positive electrode sheet, the method comprising: firstly dispersing a binder and a conductive agent in a solvent evenly, then adding a positive electrode active material to disperse evenly, and finally adding a positive electrode supplementary The lithium additive is uniformly dispersed, and then the positive electrode current collector is subjected to slot die extrusion coating, drying the polar piece in an oven (temperature is 100-110° C.), cold roll rolling, and punching to obtain the positive electrode piece.

[0039] According to the fifth aspect of the present invention, the present invention provides a lithium ion battery, the lithium ion battery includes a positive electrode piece, a negative electrode piece, a non-aqueous electrolyte, a separator and a packaging film; wherein, the positive electrode piece is the The positive electrode sheet according to t...

Embodiment 1

[0043] (1) First mix Super P (2wt%) and PVDF (3wt%) in solvent NMP (nitrogen methyl pyrrolidone), then add LiNi 5 Co 2 Mn 3 O 2 (90wt%) mixed uniformly, finally added lithiated hydroxy-p-toluene (5wt%) and mixed uniformly, the positive electrode sheet was obtained by coating, baking, rolling and punching on aluminum foil;

[0044] (2) First dissolve carboxymethyl cellulose (CMC) (1.5wt%) in deionized water (solid content 1.5%), then add artificial graphite (85wt%), silicon oxide to the 50% CMC solution in turn (10wt%) and Super P (1wt%) were dispersed evenly, then the remaining CMC solution and SBR (2.5wt%) were added to disperse evenly, and the negative electrode sheet was obtained by coating, baking, rolling and punching on the copper foil;

[0045] (3) After assembling the positive electrode sheet, the negative electrode sheet and the separator, inject a non-aqueous electrolyte to obtain a lithium ion battery.

Embodiment 2

[0047] (1) First mix Super P (2wt%) and PVDF (3wt%) in solvent NMP (nitrogen methyl pyrrolidone), then add LiNi 5 Co 2 Mn 3 O 2 (90wt%) mixed uniformly, finally added lithiated 3,5-dihydroxymethylbenzene (5wt%) and mixed uniformly, the positive electrode sheet was obtained by coating, baking, rolling and punching on aluminum foil;

[0048] (2) First dissolve CMC (1.5wt%) in deionized water (solid content 1.5%), then add artificial graphite (85wt%), silicon oxide (10wt%), Super P to the 50% CMC solution in turn (1wt%) is uniformly dispersed, then the remaining CMC solution and SBR (2.5wt%) are added for uniform dispersion, and a negative electrode sheet is obtained by coating, baking, rolling and punching on the copper foil;

[0049] (3) After assembling the positive electrode sheet, the negative electrode sheet and the separator, inject a non-aqueous electrolyte to obtain a lithium ion battery.

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Abstract

The invention provides a positive pole lithium supplement additive, the structure of the additive is shown in the following formula, the invention provides a positive pole piece and a preparation method thereof, and the positive pole piece contains the positive pole lithium supplement additive. The invention also provides a lithium ion secondary battery. The lithium ion secondary battery comprises the positive pole piece, a negative pole piece, an organic electrolyte, a diaphragm and a packaging film. The positive electrode lithium supplement additive provided by the invention can supplement lithium ions consumed in the formation process of an SEI film of a lithium ion battery, can effectively reduce the capacity loss problem of the lithium ion battery in the first charging and discharging process, improves the first charging and discharging efficiency, and improves the energy density of the lithium ion battery;

Description

technical field [0001] The invention relates to a positive electrode lithium supplementing additive and a positive electrode pole piece, a preparation method thereof and a lithium ion battery. Background technique [0002] With the continuous improvement of the energy density of power batteries, traditional graphite materials (theoretical capacity of 372mAh / g) have been unable to meet the design requirements of high specific energy batteries. Si anode materials with higher capacity have become the best choice for improving the specific capacity of the anode. , the theoretical capacity of Si material can reach 4200mAh / g, but the huge volume expansion (over 300%) also leads to its poor cycle performance. SiO x The material has become the mainstream of application in recent years, but SiO x Lithium oxide will be formed in the material during the first insertion of Li, which will cause a large amount of Li element to lose its activity and become dead lithium, which will reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/235H01M10/0525H01M10/42
CPCC07C39/235H01M10/4235H01M10/0525
Inventor 张舒廖鹏熊德军
Owner FARASIS TECH (GANZHOU) CO LTD
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