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Application of hydroxyl compound in high-voltage lithium ion battery and high-voltage lithium ion battery

A lithium-ion battery, high-voltage technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of reduced structural stability of positive electrode materials, irreversible attenuation of capacity, and structural collapse of positive electrode materials. To achieve the effect of improving cycle stability, not easy to oxidize and decompose, and avoiding reaction

Inactive Publication Date: 2019-04-05
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, increasing the cut-off voltage of the positive electrode material also faces many problems: first, as the voltage increases, the oxidation activity of the positive electrode material increases, and the reaction between the positive electrode material and the electrolyte also accelerates, and the stability of the positive electrode material structure decreases. lead to a decrease in the cycle performance of the battery
Secondly, the conventional electrolyte used in conjunction with the positive electrode material has extremely poor compatibility at high voltage, and the commonly used carbonate-based electrolyte is prone to oxidative decomposition at high voltage, and the produced by-products have a negative impact on battery performance On the one hand, the internal impedance of the battery increases, on the other hand, the positive electrode material of the battery will also be corroded, especially for ternary materials, nickel cobalt manganese plasma will be dissolved from the positive electrode material under high voltage, causing the structure of the positive electrode material to collapse, thus Causes the irreversible attenuation of capacity, which in turn leads to a decrease in the cycle performance of the battery

Method used

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  • Application of hydroxyl compound in high-voltage lithium ion battery and high-voltage lithium ion battery
  • Application of hydroxyl compound in high-voltage lithium ion battery and high-voltage lithium ion battery
  • Application of hydroxyl compound in high-voltage lithium ion battery and high-voltage lithium ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0089] Exemplarily, the preparation method of the high-voltage lithium-ion battery electrolyte includes the following steps: uniformly mixing the solvent after removing water and impurities with conductive lithium salt, and then uniformly mixing with the above-mentioned functional additives.

[0090] Preferably, the solvent uses one or more of activated carbon, 3A molecular sieve, 4A molecular sieve, calcium chloride, anhydrous calcium oxide, and calcium hydride to remove water and impurities. Preferably, the 3A molecular sieve or the 4A molecular sieve is activated and then used for water and impurity removal, which can be activated by means of heating, purging, ammonia flushing or adsorbent adsorption.

[0091] Preferably, the temperature when the solvent is mixed with the conductive lithium salt is 20-40°C.

[0092] Preferably, the mixing speed when the solvent is mixed with the conductive lithium salt is 200-1500 r / s.

[0093] Preferably, the mixing time of the solvent an...

Embodiment 1-9

[0113] A high-voltage lithium-ion battery electrolyte, which includes a solvent, a conductive lithium salt, and functional additives, and the formulations of the electrolytes in each embodiment are listed in Table 1.

[0114] Table 1

[0115]

[0116]

[0117] The difference between embodiment 2 and embodiment 1 is that embodiment 2 adopts the preferred polyether polyol of the present invention as a functional additive;

[0118] The difference between embodiment 3 and embodiment 2 is that embodiment 3 has adopted the preferred polyoxypropylene diol of the present invention as functional additive;

[0119] The difference between embodiment 4 and embodiment 2 is that the addition amount of the functional additive in embodiment 4 is within the preferred range of the present invention;

[0120] The difference between Example 6 and Example 5 is that the concentration of the conductive lithium salt in Example 6 is within the preferred range of the present invention.

[0121]...

Embodiment 10-18

[0124] A positive electrode slurry for a high-voltage lithium ion battery, the positive electrode slurry includes positive electrode materials, conductive carbon black, NMP, and functional additives. The formulations of the positive electrode slurries in each embodiment are listed in Table 2.

[0125] Table 2

[0126]

[0127]

[0128] Note: NCM622 refers to LiNi 0.6 co 0.2 mn 0.2 o 2 , NCM532 means LiNi 0.5 co 0.3 mn 0.2 o 2 .

[0129] The difference between Example 11 and Example 10 is that Example 11 uses the preferred polyether polyol of the present invention as a functional additive;

[0130] The difference between embodiment 12 and embodiment 11 is that embodiment 12 adopts the preferred polyoxypropylene diol of the present invention as a functional additive;

[0131] The difference between Example 13 and Example 11 is that the amount of functional additive added in Example 13 is within the preferred range of the present invention;

[0132] The differenc...

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Abstract

The present invention relates to the field of lithium ion batteries, especially provides application of hydroxyl compound in a high-voltage lithium ion battery and a high-voltage lithium ion battery.The high-voltage lithium ion battery comprises at least one of a functional additive for a high-voltage lithium ion battery, a high-voltage lithium ion battery electrolyte or high-voltage lithium ionbattery positive electrode slurry, the high-voltage lithium ion battery electrolyte and high-voltage lithium ion battery positive electrode slurry comprise the functional additive for the high-voltagelithium ion battery e, and the functional additive comprises a hydroxyl compound. The hydroxyl in the hydroxyl compound is reacted with the Li in the lithium ion battery positive electrode material to form an SEI film with good performances and the SEI film can effectively inhibit the reaction between the electrolyte solvent and the positive electrode materials so as to improve the cycle performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to the application of a hydroxyl-containing compound in high-voltage lithium-ion batteries and the high-voltage lithium-ion batteries. Background technique [0002] The existing common commercial lithium-ion cathode materials include lithium iron phosphate, lithium cobaltate, and nickel-cobalt-manganese ternary materials. Low, so the energy density is not high enough. With the increasing market demand for high-energy-density lithium-ion batteries, in addition to the research and development of new materials, it is also one of the research hotspots to deeply explore and improve the energy density of existing materials. effective means of density. [0003] However, increasing the cut-off voltage of the positive electrode material also faces many problems: first, as the voltage increases, the oxidation activity of the positive electrode material increases, and the reaction betwee...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 汤依伟尚国志杨幸吴剑
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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