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Positive electrode lithium supplementing additive and preparation method thereof, positive electrode and lithium ion battery

A technology of lithium-ion batteries and additives, which is applied in the direction of positive electrodes, battery electrodes, secondary batteries, etc., can solve the problems of unfavorable positive electrode lithium supplementation effect, lower high-temperature storage performance of batteries, and increase of battery impedance, so as to achieve compensation Discharge irreversible capacity loss, improve high-temperature storage performance, and increase energy density

Active Publication Date: 2022-07-08
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are lithium-supplementing additives in positive lithium supplementation, which lead to an increase in the impedance of the battery cell after delithiation, and an increase in gas production, which leads to a decrease in the high-temperature storage performance of the battery cell. In addition, such as Li 5 FeO 4 , Li 2 NiO 2 , Lithium ascorbate, lithium phytate and other positive electrode lithium supplement additive materials have poor stability and are sensitive to humidity. They are easy to react with water and carbon dioxide in the air in the air atmosphere, and are easily oxidized and deteriorated, which is not conducive to the positive electrode lithium supplement effect.

Method used

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  • Positive electrode lithium supplementing additive and preparation method thereof, positive electrode and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0049] The preparation steps of the positive electrode lithium supplementary additive of the present embodiment are as follows:

[0050] S1: Mix 100g of 4,4'-dimethylbiphenyl and 1000g of tetrahydrofuran uniformly to obtain a dimethylbiphenyl solution, add 10g of metal lithium flakes to the dimethyl biphenyl solution and continue to stir, and the metal lithium flakes are stirred In the process, it is gradually complexed with dimethyl biphenyl to obtain an organolithium solution;

[0051] S2: Add analytically pure vanadium pentoxide to the above organolithium solution, continue stirring for 10h at room temperature, driven by the potential difference, the lithium in the organolithium solution is gradually inserted into V 2 O 5 , and finally obtain the positive lithium supplementary additive lithium vanadium oxylithium salt Li 4 V 2 O 5 .

[0052] Preparation of cells:

[0053] Preparation of positive electrode sheet: the positive electrode active material LiNi 0.8 Co 0.1...

Embodiment 2

[0057] Based on Example 1, the only difference is that: in Example 2, in the step S2 of preparing the positive electrode lithium supplementing additive, the stirring was continued at room temperature for 20 h.

[0058] The chemical formula of the positive lithium-supplementing additive lithium vanadium salt prepared in this example is Li 4.5 V 2 O 5 .

Embodiment 3

[0060] Based on Example 1, the only difference is that: in Example 3, in the step S2 of preparing the positive electrode lithium supplementing additive, the stirring was continued at room temperature for 40 h.

[0061] The chemical formula of the positive lithium-supplementing additive lithium vanadium salt prepared in this example is Li 5 V 2 O 5 .

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Abstract

The present application discloses a positive electrode lithium supplementing additive and a preparation method thereof, a positive electrode and a lithium ion battery, including a vanadium oxylithium salt, and the chemical formula of the vanadium oxylithium salt is Li 4+x V 2 O 5 , where 0≤x≤1. The present application reduces the resistance of the battery cell, reduces the gas production of the battery, improves the high-temperature storage performance of the battery, and at the same time can significantly improve the first efficiency of the battery cell, thereby improving the energy density of the battery cell.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a positive electrode lithium supplementing additive and a preparation method thereof, a positive electrode and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in the fields of digital and power tools due to their high energy density and long cycle life. In recent years, the application of large-scale mobile energy storage batteries such as electric vehicles and drones has developed, and the development of lithium-ion batteries with higher energy density has become an important topic at present. The current common problem of lithium-ion batteries is that a large amount of lithium ions extracted from the positive electrode will be consumed during the first charging process to form an SEI film on the surface of the negative electrode. Second, lithium-ion batteries continue to consume active lithium during normal use. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M4/13H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M10/4235H01M4/13H01M4/505H01M4/525H01M4/5825H01M4/622H01M4/625H01M10/0525H01M2004/028Y02P70/50
Inventor 陈鹏褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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