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Composite lithium supplement additive and lithium ion battery positive electrode lithium supplement method

An additive and lithium-replenishing technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as generating more oxygen, affecting battery safety and stability, and performance degradation, avoiding safety risks and achieving cycle stability. , the effect of high capacity

Pending Publication Date: 2022-07-22
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing positive electrode lithium supplementation technology, gas will be generated due to the decomposition of the lithium supplementary agent, especially a type of lithium supplementary sacrificial agent that undergoes anion redox, which will generate more oxygen during the first cycle of charging, which is harmful to the safety of the battery. Sexuality and stability will be seriously affected
[0006] Therefore, the development of a simple and efficient safe lithium supplementation technology can not only solve the problem of performance attenuation caused by irreversible lithium ion consumption, but also use the generated oxygen to protect the positive electrode, solve the problem of gas production, and improve the performance of the positive electrode and the entire battery. cycle stability

Method used

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  • Composite lithium supplement additive and lithium ion battery positive electrode lithium supplement method
  • Composite lithium supplement additive and lithium ion battery positive electrode lithium supplement method
  • Composite lithium supplement additive and lithium ion battery positive electrode lithium supplement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1) Ball Milling Lithium Additive Lithium 5 FeO 4 To particle size less than 100nm;

[0059] 2) To 84mg triphenylphosphine and 450mg Li 5 FeO 4 50 mL of chloroform was added to the powder, stirred for 4 h, and the solvent was evaporated at 80° C. to obtain a composite lithium-supplementing additive (N=1); the molar fraction of phosphorus in the composite lithium-supplementing additive was 10%;

[0060] 3) The nickel cobalt lithium manganate LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811), carbon black and binder (PVDF) were mixed in a mass ratio of 90:5:5, and a composite lithium-supplementing additive with an active material mass fraction of 2wt% was added to make a slurry, and the slurry was uniformly coated on the carbon-coated aluminum foil set. On the fluid, it was dried by blasting at 70 °C and then dried in a vacuum oven at 80 °C for 8 hours to prepare a positive electrode sheet with both lithium supplementation and stable cycling.

Embodiment 2

[0062] The rest are the same as in Example 1, except that the content of the composite lithium supplementing additive in the positive electrode is 5 wt %.

Embodiment 3

[0064] The rest are the same as in Example 2, except that the content of the composite lithium-supplementing additive in the positive electrode is 10 wt %.

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Abstract

The invention discloses a composite lithium supplement additive and a lithium ion battery positive electrode lithium supplement method. The composite lithium supplement additive is composed of an inner core lithium supplement compound and an outer layer phosphorus-containing compound. The lithium supplementing compound is selected from one or more of Li5FeO4, Li5Fe5O8, Li6CoO4, Li2NiO2, Li2O and Li2O2, and the phosphorus-containing compound is selected from one or more of phosphate ester, phosphite ester, alkyl phosphonate and phenyl substituted, halogen substituted and thiophenyl substituted compounds thereof. The lithium supplementing method comprises the following steps: mixing a positive electrode active material, a binder and the composite lithium supplementing additive in a solvent to prepare slurry; and uniformly coating the surface of a current collector with the slurry, and drying to prepare the lithium-supplementing positive electrode material. According to the lithium supplementing method, oxygen generated in the first-circle charging process can be absorbed by the phosphorus-containing compound and forms a uniform coating layer on the surfaces of the positive electrode particles, so that the lithium supplementing and gas generating problems are solved, and the cycling stability of the battery is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a composite lithium-replenishing additive and a lithium-ion battery positive electrode lithium-replenishing method capable of stable cycling. Background technique [0002] With the advancement of lithium-ion battery technology, its market share in consumer electronics, power batteries and energy storage has grown rapidly in recent years. Especially in today's vigorous development of clean energy, the further promotion of new energy electric vehicles will greatly promote energy conservation and emission reduction. [0003] With the increasing popularity of new energy vehicles, people have put forward higher requirements for the performance of lithium-ion batteries, especially the cycle stability, energy density and safety performance of lithium-ion batteries. In order to solve the range anxiety of new energy vehicles, battery systems with higher energy density are being widel...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/60H01M4/62
CPCH01M4/525H01M4/60H01M4/62H01M4/624Y02E60/10
Inventor 郭玉国孟庆海范敏常昕顾超凡殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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