Preparation method of surface-coating anode material of lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor high-temperature storage performance, low capacity, and poor cycle performance, and achieve good cycle stability and high quality ratio Excellent capacity and cycle stability

Inactive Publication Date: 2014-03-26
高建军
3 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Currently used lithium-ion battery cathode materials have their own disadvantages: LiCoO 2 The price is high, the structure is unstable after the charging voltage exceeds 4.2V, and the safety becomes poor; LiNi 0.8 co 0.2 o 2 The cycle performance of LiNi is not good, the water absorption is strong, and the storage performance is poor; LiNi 0.8 co 0.15 Al 0.05 o 2 Easy to absorb water, poor storage performance; LiNi 1/3 co 1/3 mn ...
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Abstract

The invention discloses a preparation method of a surface-coating anode material of a lithium ion battery. The preparation method comprises the steps of (1) mixing lithium iron phosphate, lithium nickel cobalt oxide, magnesium nitrate and cobalt oxide to form an anode material mixture, heating the anode material mixture to above the melting point of the magnesium nitrate, and cooling the mixture after reaction lasts for 2h to 6h; (2) grinding the cooled anode material mixture, sieving the ground anode material mixture by utilizing a 200-mesh screen, placing the sieved mixture into a mixing drying kettle, and spraying a lithium hydroxide saturated solution into the mixing drying kettle; (3) staring a mixer, spraying aluminum sulfate into the mixing drying kettle to obtain hydrolysis reaction mixture; (4) drying, thermally treating and cooling the hydrolysis reaction mixture, pulverizing the mixture, and sieving the mixture by utilizing the 200-mesh screen to obtain the surface-coating lithium ion battery anode material. The anode material prepared by adopting the preparation method is uniformly coated, so that the circulation stability is good, the quality is high, the specific capacity is high, when the anode material is applied to a lithium ion battery, t he capacity is high, the circulating stability is good, and the service life is long.

Application Domain

Cell electrodes

Technology Topic

Cobalt oxideAluminium salts +15

Examples

  • Experimental program(2)
  • Comparison scheme(1)

Example Embodiment

[0011] Embodiment one
[0012] Preparation of cathode material mixture
[0013] The positive electrode materials lithium iron phosphate, lithium nickel cobaltate, magnesium nitrate, and cobalt oxide are placed in a mixing and drying kettle with a mass ratio of 25:6:11:12, and the mixer is started for mixing to form a positive electrode material mixture. The obtained positive electrode material mixture was heated to above the melting point of magnesium nitrate to react for 2 hours and then cooled.
[0014] Preparation of the hydrolysis reaction mixture
[0015] The cooled positive electrode material mixture is ball milled and crushed, passed through a 200-mesh sieve, and then placed in a mixing and drying kettle; a saturated lithium hydroxide solution accounting for 1.5% by mass of the positive electrode material mixture is placed in a spray system, and the spray system is controlled to Spray in the mixing drying tank; after spraying, mix and react for 1 hour, so that the saturated solution of lithium hydroxide is evenly adsorbed on the surface of the mixture.
[0016] Continue to start the mixer, and place the aluminum sulfate whose content is just completely reacted with lithium hydroxide in the spray system, control the spray system to spray in the mixing drying kettle, and then continue to mix for 1 hour after spraying, so that the hydrolysis reaction can be completed evenly. A hydrolysis reaction mixture is obtained.
[0017] Preparation of cathode materials for lithium-ion batteries
[0018] The mixture obtained after the hydrolysis reaction is placed in a vacuum drying system, the temperature is kept at 100°C, and the steam is continuously extracted for drying, and the pressure is kept between 0.02 standard atmospheric pressure. After drying for 5 hours, it is cooled. The cooled hydrolysis reaction mixture was placed in a heat treatment furnace, heated to 500°C in an air atmosphere, kept at room temperature for 5 hours, naturally cooled to room temperature, taken out, crushed through a 200-mesh sieve to obtain a surface-coated lithium battery positive electrode material.

Example Embodiment

[0019] Embodiment two
[0020] Preparation of cathode material mixture
[0021] The positive electrode materials lithium iron phosphate, lithium nickel cobaltate, magnesium nitrate, and cobalt oxide are placed in a mixing and drying kettle with a mass ratio of 35:11:14:18, and the mixer is started to mix to form a positive electrode material mixture. The obtained positive electrode material mixture was heated to above the melting point of magnesium nitrate to react for 6 hours and then cooled.
[0022] Preparation of the hydrolysis reaction mixture
[0023] The cooled positive electrode material mixture is ball milled and crushed, passed through a 200-mesh sieve, and then placed in a mixing and drying kettle; a saturated lithium hydroxide solution accounting for 1.5% by mass of the positive electrode material mixture is placed in a spray system, and the spray system is controlled to Spray in the mixing and drying tank; after spraying, mix and react for 3 hours, so that the saturated solution of lithium hydroxide is evenly adsorbed on the surface of the mixture.
[0024] Continue to start the mixer, and place the aluminum sulfate whose content is just completely reacted with lithium hydroxide in the spray system, control the spray system to spray in the mixing drying kettle, and then continue to mix for 3 hours after spraying, so that the hydrolysis reaction can be completed evenly. A hydrolysis reaction mixture is obtained.
[0025] Preparation of cathode materials for lithium-ion batteries
[0026] The mixture obtained after the hydrolysis reaction was placed in a vacuum drying system, the temperature was kept at 130° C., and the steam was continuously extracted for drying, and the pressure was kept between 0.05 standard atmospheric pressure. After drying for 10 hours, it was cooled. The cooled hydrolysis reaction mixture was placed in a heat treatment furnace, heated to 700°C in an air atmosphere, kept at room temperature for 8 hours, naturally cooled to room temperature, taken out, crushed through a 200-mesh sieve to obtain a surface-coated lithium battery positive electrode material.
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Description & Claims & Application Information

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