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Preparation method of anode composition, anode composition and lithium ion battery

A composition and lithium-ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as reduction, impact on cathode material performance, etc., and achieve the effect of improving material performance

Active Publication Date: 2019-08-09
罗特 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to, aiming at the deficiencies in the above-mentioned prior art, provide a kind of preparation method of cathode composition, cathode composition and lithium ion battery, will produce reduction when coating carbon, cause the performance of cathode material issues that affect

Method used

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  • Preparation method of anode composition, anode composition and lithium ion battery
  • Preparation method of anode composition, anode composition and lithium ion battery
  • Preparation method of anode composition, anode composition and lithium ion battery

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preparation example Construction

[0036] like figure 1 As shown, the embodiment of the present invention provides a preparation method of a cathode composition, comprising:

[0037] S110. Perform oxidation treatment on the cathode material, so that the average valence state of active transition metal elements in the cathode material after treatment is higher than the average valence state of active transition metal elements in the cathode material before treatment, and the cathode material after treatment has an average valence state of active transition metal elements. The lithium ion content of the material is less than the lithium ion content of the cathode material before treatment.

[0038] In some embodiments, the cathode material may be LiNi 1-x-y Co x Mn y O 2 , where 01-x-y Co x Al y O 2 , where 0x Mn 2-x O 4 Can also be used as cathode material, where 0≤x≤0.5. Alternatively, there is a cathode material that can use xLi 2 MnO 3 ·(1-x)LiXO 2 , where 00.6 Co 0.2 Mn 0.2 O 2 or Li 1-x Ni ...

Embodiment 1

[0082] Weigh 100 parts by mass of LiNi 0.6 Co 0.2 Mn 0.2 O 2 Cathode material, 6.15 parts by mass Na 2 S 2 O 8 (S 2 O 8 2- / SO 4 2- The standard reduction potential is 2.01V), added to 100 parts by mass of deionized water (solid content of 53%), stirred and reacted at normal temperature (25 ° C) for 6 hours, and then filtered, using 100 parts by mass of deionized water each time. water, and the filter cake was washed 3 times. It was then placed in a drying oven at 80°C for 12 hours. get Li 1-x Ni 0.6 Co 0.2 Mn 0.2 O 2 Sample (x is the proportion of lithium removed). Then according to Li per 100 parts by mass 1-x Ni 0.6 Co 0.2 Mn 0.2 O 2 Sample, weigh 7.0 parts by mass of sucrose and 2.3 parts by mass of LiOH·H 2 O, added to the ball mill for 4 hours, sieved, and the sieved material was packed in a corundum crucible, placed in a box furnace, sintered at 700°C for 4 hours under an inert atmosphere (nitrogen), cooled to room temperature, pulverized, Pass t...

Embodiment 2

[0097] Weigh 100 parts by mass of LiNi 0.8 Co 0.15 Al 0.05 O 2 Cathode material, 7.3 parts by mass KClO 4 (ClO 4- / ClO 3- The standard reduction potential is 1.2V), added to 50 parts by mass of deionized water (solid content of 68%), stirred and reacted at 40 ° C for 3 hours, and then filtered, using 100 parts by mass of deionized water each time, the The filter cake was washed 3 times. Take a filter cake sample, test the water content of the filter cake sample is about 8%, and then weigh 5.5 parts of asphalt and 4.7 parts of LiOH per 108.7 parts of the mass of the filter cake sample (corresponding to 100 parts of mass dewatering samples) ·H 2 O, was added to 40 parts by mass of ethanol (solid content was 73%), and the material was fully dispersed by ball milling to form a homogeneous mixture, dried in a vacuum drying oven at 60°C for 1 hour, pulverized and sieved. The sieve material is packed in a corundum crucible, placed in a box furnace, sintered at 650 ° C for 12 ...

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Abstract

The invention provides a preparation method of a cathode composition, an anode composition and a lithium ion battery, and relates to the technical field of anode material preparation. The preparationmethod of the anode composition of the lithium ion battery comprises the steps of: performing oxidation treatment for an anode material to allow the average valence state of active transition metal elements in the treated anode material to be higher than that of the active transition metal elements in the anode material prior to treatment, wherein the lithium ion content of the treated anode material is less than that of the anode material prior to treatment; and mixing the treated anode material with a carbon source and a lithium source to obtain a mixed anode material, sintering the mixed anode material in an inert atmosphere or a reducing atmosphere to obtain a carbon-coated lithium-ion anode composition. Because the lithium ions removed during carbon coating are re-embedded, the body structure of the anode material is recovered, and the material performance of the finally obtained carbon-coated lithium ion anode composition is obviously improved.

Description

technical field [0001] The present invention relates to the technical field of cathode material preparation, in particular, to a preparation method of a cathode composition, a cathode composition and a lithium ion battery. Background technique [0002] The electrical conductivity, electrochemical stability, and chemical stability of lithium-ion battery cathode materials have a significant impact on the performance of the battery. Among them, the electronic conductivity of the material can significantly affect the internal resistance of the battery and the speed of the electrochemical reaction, thereby directly affecting the rate performance of the battery. Electrochemical stability mainly refers to the ability to inhibit cathode side reactions at high potentials, while chemical stability refers to the ability to resist electrolyte corrosion, because the electrolyte of lithium-ion batteries usually contains trace but extremely corrosive hydrofluoric acid (HF). ). [0003] C...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 袁长福罗特
Owner 罗特
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