Long-life lithium ion battery ternary positive electrode material, preparation method thereof and application

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of long-life lithium-ion battery ternary positive electrode materials and its preparation, can solve problems such as uneven and continuous coating layers, unsatisfactory improvement effects, and poor oxidation resistance stability. Surface protection and structural stability, easy mass production, good wettability

Active Publication Date: 2019-11-12
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon coating is mainly used to improve the electronic conductivity of the material, and does not help much to inhibit the electrode / electrolyte interface reaction; the coating of oxide and phosphide helps to reduce the electrode / electrolyte interface reaction, but the inorganic material is brittle. Large, uneven and continuous coating layer, easy to break during the charging and discharging process of the electrode, so the role of this type of material is limited. Conductive polymers can protect the ternary cathode material while improving the electronic conductivity of the electrode, but this The anti-oxidation stability of such materials is poor, and there is no chemical bond between the nitrogen atom and Ni, Co, Mn to rent each other, so the improvement effect is not ideal

Method used

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  • Long-life lithium ion battery ternary positive electrode material, preparation method thereof and application
  • Long-life lithium ion battery ternary positive electrode material, preparation method thereof and application
  • Long-life lithium ion battery ternary positive electrode material, preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example provides a single crystal LiNi 0.8 co 0.1 mn 0.1 o 2 The interface modification and preparation method specifically comprise the following steps:

[0031] (a) Heat and dissolve 0.05g of polymethyl methacrylate (PMMA) in 10g of acetone solvent (water removed by molecular sieve), and stir for 2h to form a uniform solution.

[0032] (b) Take 2g single crystal LiNi 0.8 co 0.1 mn 0.1 o 2 The active material is slowly added into the PMMA solution under the condition of 30° C., and kept stirring, and the solution is heated under the condition of constant stirring until the solvent is completely volatilized.

[0033] (c) Aging the powder product obtained in the above steps in a vacuum drying oven at a temperature controlled at 60° C. for 8 hours to obtain a ternary-coated positive electrode material with a PMMA coating amount of 2.5%.

[0034] The present invention also provides the application of this coated ternary positive electrode material in lithium-i...

Embodiment 2

[0036] This example provides a coating type single crystal LiNi 0.8 co 0.1 mn 0.1 o 2 The preparation method of the positive electrode material is basically the same as that in Example 1, except that 0.03 g of polyethyl methacrylate (PEMA) is dissolved in 10 g of toluene solvent for coating modification to obtain the PEMA coating amount It is 1.5% ternary coating cathode material.

Embodiment 3

[0038] This example provides a coating type single crystal LiNi 0.8 co 0.1 mn 0.1 o 2 The preparation method of the positive electrode material is basically the same as that in Example 1, except that 0.04 g of polyisoethyl methacrylate is dissolved in 10 g of toluene solvent for coating modification, and the coating amount is 2.0% Polyisoethyl methacrylate ternary coating cathode material.

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PUM

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Abstract

The invention discloses a long-life lithium ion battery ternary positive electrode material, which comprises a ternary material as a substrate and a polymer coating layer coating the surface of the ternary material, wherein the polymer comprises a polycarboxylate polymer compound with a structure. The invention also provides a preparation method and application of the long-life lithium ion batteryternary positive electrode material. The long-life lithium ion battery ternary positive electrode material has good mechanical properties and excellent capacitance characteristics, is cheap, and is simple to prepare, and can be popularized as a commercial capacitor material.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a long-life lithium-ion battery ternary positive electrode material and a preparation method and application thereof. Background technique [0002] In recent years, with the increasing demand for electric vehicles, hybrid vehicles and large-scale energy storage, people have put forward higher requirements for the energy density and cost of lithium-ion batteries. On the one hand, the ratio of positive electrode materials needs to be greatly increased. Capacity and specific energy, but also to reduce the demand for cobalt. In this context, ternary cathode materials have attracted widespread attention. The ternary cathode material has LiNi 1-x-y co x m y o 2 (1≥x≥0, 1≥y≥0, x+y<1, M=Mn, Al) chemical composition, including NCM811, NCM622, NCM523, NCM111 and NCA, which are common in China. The outstanding advantages of this type of material are that on the one hand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028Y02E60/10
Inventor 郑洪河
Owner SUZHOU UNIV
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