Coated modified lithium ion battery layered cathode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems that have not been reported before, achieve uniform coating, ensure electrochemical performance, and improve cycle performance

Active Publication Date: 2016-10-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the study of binary copolymers P(VDF-TFE) and P(VDF-TrFE) coated

Method used

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  • Coated modified lithium ion battery layered cathode material and preparation method thereof
  • Coated modified lithium ion battery layered cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 0.1 g of P(VDF-TrFE) into 5 ml of DEC solution, stir to dissolve; then add 10 g of layered cathode material Li 1.2 [Mn 0.54 Ni 0.13 co 0.13 ]O 2 Add it to the solution after stirring and dissolving, stir again evenly, and dry at 110°C to obtain the coated precursor; place the dried precursor in a tube furnace, heat it in the air, and heat it at 140°C After 3 hours of treatment, the target product coated with 1wt% P(VDF-TrFE) was obtained.

[0030] Such as figure 1 as shown, figure 1 It is the 1wt% P (VDF-TrFE) coated Li of the above-mentioned embodiment 1 1.2 [Mn 0.54 Ni 0.13 co 0.13 ]O 2 / Li button cell cycle performance diagram; where, a is Li 1.2 [Mn 0.54 Ni 0.13 co 0.13 ]O 2 , b is 1wt% P(VDF-TrFE) coated Li 1.2 [Mn 0.54 Ni 0.13 co 0.13 ]O 2 , it can be concluded from the figure that under the same test conditions, the P(VDF-TrFE) coated Li 1.2 [Mn 0.54 Ni 0.13 co 0.13 ]O 2 The cycle performance of the material is significantly improved,...

Embodiment 2

[0033] Add 1 gram of P(VDF-TFE) to 10 ml of EC solution, stir to dissolve; then add 20 grams of layered cathode material Li[Ni 0.6 co 0.2 mn 0.2 ]O 2 Add it to the solution after stirring and dissolving, stir again, and dry at 60°C to obtain the coated precursor; place the dried precursor in a tube furnace, and heat it at 140°C for 3 hours under vacuum conditions. The target product coated with 5wt% P(VDF-TFE) was obtained.

Embodiment 3

[0035] Add 0.1 g of P(VDF-TrFE) to 2 ml of NMP solution, stir to dissolve; then add 20 g of layered cathode material Li[Ni 0.5 co 0.2 mn 0.3 ]O 2 Add it to the solution after stirring and dissolving, stir again, and dry at 60°C to obtain the coated precursor; place the dried precursor in a tube furnace, and heat it at 140°C for 3 hours in the air environment , the target product coated with 0.5wt% P(VDF-TrFE) was obtained.

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PUM

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Abstract

The invention discloses a coated modified lithium ion battery layered cathode material which is characterized in that the surface of a lithium ion battery layered cathode material is coated with a P(VDF-TFE) or P(VDF-TrFE) film. The invention further discloses a preparation method of the coated modified lithium ion battery layered cathode material. The preparation method particularly comprises the following steps: 1) firstly, taking a certain amount of P(VDF-TFE) or P(VDF-TrFE), adding into an organic solution, and stirring for dissolution; 2) adding the lithium ion battery layered cathode material into a solution obtained after the stirring for dissolution, and after uniform stirring, drying at 60-110 DEG C to obtain a coated precursor; 3) placing the dried precursor material in a tube furnace, and conducting heating treatment at 100 to 100 DEG C for 2-5 h under the air or vacuum condition, so as to obtain the target product of which the surface is coated with 0.5wt%-5wt% of P(VDF-TFE) or P(VDF-TrFE). The coating layer is beneficial to improvement of the electric conductivity of the layered cathode material and intercalation and deintercalation of Li<+> in an active material, the polymer film layer on the surface of the coated cathode material is good in uniformity and continuity, and meanwhile the method is mature and reliable in technology.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery layered positive electrode materials, in particular to a coated modified lithium-ion battery layered positive electrode material and a preparation method thereof. Background technique [0002] Because lithium-ion batteries have a series of advantages such as high energy density, light weight, no memory effect, good rate performance, and long cycle life, the outstanding advantage of high energy density makes lithium-ion batteries recognized as a new generation of electric vehicles. , The ideal power source for hybrid electric vehicles. Among them, the energy density of the lithium-ion battery mainly depends on the energy density of the cathode material; the energy density of the cathode material is high, and the energy density of the lithium-ion battery must also be high. Therefore, the development of cathode materials with high energy density has become the focus of research. Am...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60H01M10/0525H01M4/48H01M4/505
CPCH01M4/366H01M4/48H01M4/505H01M4/602H01M10/0525Y02E60/10
Inventor 孔继周周飞王谦之尹亮
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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