Positive electrode material, preparation method and application thereof, and lithium ion battery

A cathode material, lithium source technology, applied in the direction of positive electrode, battery electrode, secondary battery, etc., can solve the problem of lithium-ion battery cycle, capacity, rate can not meet the needs and other problems, achieve suitable for large-scale industrial production, reduce interface Impedance, the effect of improving the magnification performance

Pending Publication Date: 2022-05-06
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a positive electrode material and its preparation in order to overcome the problems in the prior art that the cycle, capacity, rate and other properties of the lithium ion battery cannot meet the requirements due to the side reaction between the electrolyte and the positive electrode material. Method and application, the positive electrode material includes a substrate and a cladding layer coated on the surface of the substrate, the cladding layer of this specific composition has high ion and electron conductivity, and can avoid side reactions between the positive electrode material and the electrolyte, Improve compatibility, and the lithium-ion batteries prepared from the cathode materials thus obtained have high rate performance and energy density

Method used

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  • Positive electrode material, preparation method and application thereof, and lithium ion battery
  • Positive electrode material, preparation method and application thereof, and lithium ion battery
  • Positive electrode material, preparation method and application thereof, and lithium ion battery

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preparation example Construction

[0071] The second aspect of the present invention provides a method for preparing a positive electrode material, characterized in that the preparation method comprises the following steps:

[0072] S1. The nickel-cobalt-manganese hydroxide precursor, lithium source and optional dopant M are first mixed to obtain a mixture I, and the mixture I is calcined, crushed, and sieved in an air or oxygen atmosphere , to obtain the positive electrode material matrix;

[0073] S2, titanium source, niobium source, optional M' source, optional M "source and optional G source, according to n(Ti):n(M'):n(Nb):n(M" ):n(G)=(1-α):α:(γ-β):β:δ molar ratio is mixed for the second time to obtain the mixture II, and in the air atmosphere, the mixture II is sintered and crushed, Get the covering material;

[0074] S3. Perform a third mixing of the positive electrode material matrix and the coating material to obtain a mixture III, and perform heat treatment on the mixture III to obtain the positive e...

preparation example 1

[0180] Nickel cobalt manganese hydroxide precursor P1

[0181] (1) Prepare a 2mol / L mixed salt solution of nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio of Ni, Co, and Mn elements of 90:5:5. Prepare 7mol / L sodium hydroxide alkali solution; prepare 6mol / L ammonia water complexing agent solution.

[0182] (2) The mixed salt solution, alkali solution, and ammonia water complexing agent solution are continuously added into the agitator in a co-current manner for reaction, and the stirring speed is 120 rpm. Simultaneously control the mixed salt solution feed flow rate to 40L / h, the alkali solution feed flow rate to 20L / h, the complexing agent solution feed flow rate to 6L / h, the pH to 11.5, the temperature to 60°C, and the reaction for 30h. When the reaction is completed, the obtained nickel-cobalt-manganese hydroxide slurry is subjected to solid-liquid separation and washing, the filter cake is dried at 100°C for 10 hours and then sieved, and ...

preparation example 2

[0184] Nickel cobalt manganese hydroxide precursor P2

[0185] (1) Prepare 2mol / L mixed salt solution of nickel sulfate, cobalt sulfate, manganese sulfate and zirconium nitrate according to the molar ratio of Ni, Co, Mn, and Zr elements of 60:20:19:1. Prepare 7mol / L sodium hydroxide alkali solution; prepare 6mol / L ammonia water complexing agent solution.

[0186] (2) The mixed salt solution, alkali solution, and ammonia complexing agent solution are continuously added into the agitator in a co-current manner for reaction, and the stirring speed is 100 rpm. At the same time, the mixed salt solution inlet flow rate is controlled to be 35L / h, the alkali solution inlet flow rate is 18L / h, the complexing agent solution inlet flow rate is 6L / h, the pH is controlled to be 11.6, the temperature is 60°C, and the reaction is 38h. When the reaction is completed, the obtained nickel-cobalt-manganese hydroxide slurry is subjected to solid-liquid separation and washing, the filter cake is ...

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Abstract

The invention relates to the field of lithium ion batteries, and discloses a positive electrode material, a preparation method and application thereof, and a lithium ion battery. The positive electrode material comprises a substrate and a coating layer coating the surface of the substrate, the matrix has a composition as shown in a formula I: Li < 1 + a > Ni < x > Co < y > Mn < z > M < k > O < 2 >, 0.5 < = a < = 0.3, 0 < = x < = 1, 0 < = y < = 1, 0 < = z < = 1, 0 < = k < = 0.06, 0lt; x + y + z + k is less than or equal to 1, and the coating layer has the composition as shown in a formula II: Ti < 1-alpha > M'alpha > Nb < gamma-beta > M '' beta O < 2 + 2.5 < gamma-delta > G < delta >, 0 < = alpha < = 0.5, 2 < = gamma < = 30, 0 < = beta < = 0.5, and 0 < = delta < = 0.4. The positive electrode material has high ion and electron conduction capability, side reaction between the positive electrode material and electrolyte can be avoided, the compatibility is improved, and the rate capability and the energy density of the lithium ion battery containing the positive electrode material can be further improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a positive electrode material, a preparation method and application thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable appliances, electric bicycles, drones, new energy electric vehicles, and energy storage due to their advantages such as high specific energy, small size, and good cycle performance. In lithium-ion batteries, the quality of the cathode material determines the overall performance of the battery. At present, the main cathode materials for lithium-ion batteries are lithium cobaltate, lithium manganate, lithium iron phosphate, and lithium nickel-cobalt manganate. [0003] In liquid lithium-ion battery systems, organic carbonates are usually used as electrolytes to provide lithium sources and channels for the transmission of lithium ions. However, due to the instability of the electrolyte during the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525
CPCH01M4/366H01M4/502H01M4/505H01M4/523H01M4/525H01M4/483H01M4/485H01M10/0525H01M2004/028
Inventor 张博皓刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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