Method for preparing surface-coated anode material of lithium battery

A positive electrode material and surface coating technology, applied in the field of battery positive electrode material preparation, can solve the problems of poor high-temperature storage performance, low capacity, and poor cycle performance, and achieve good cycle stability, high-quality specific capacity, cycle good stability effect

Active Publication Date: 2013-01-23
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently used, 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 1/3 o 2

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Blend and heat treat

[0020] Put the positive electrode materials lithium iron phosphate, lithium nickel cobaltate, magnesium nitrate, and cobalt oxide in a mixing and drying kettle with a mass ratio of 30:5:10:10, start the mixer to mix to form a mixture, and the obtained mixture After being heated to above the melting point of magnesium nitrate and reacting for 2 hours, cool down for subsequent use.

[0021] Hydrolysis reaction

[0022] Ball mill the cooled mixture and pass through a 100-mesh sieve, then place it in a mixing and drying kettle, place a saturated lithium hydroxide solution accounting for 1% by mass of the mixture in a spray system, and control the spray system to Spray, mix for 1 hour after spraying, so that the saturated solution of lithium hydroxide is evenly adsorbed on the surface of the mixture, continue to start the mixer, and place the aluminum sulfate whose content is just completely reacted with lithium hydroxide in the spray system, and ...

Embodiment 2

[0028] Blend and heat treat

[0029] Place the positive electrode materials lithium iron phosphate, lithium nickel cobaltate, magnesium nitrate, and cobalt oxide in a mixing and drying kettle with a mass ratio of 40:10:15:20, start the mixer to mix, and form a mixture. After being heated to above the melting point of magnesium nitrate and reacting for 6 hours, cool down for subsequent use.

[0030] Hydrolysis reaction

[0031] Ball mill the cooled mixture, pass through a 200-mesh sieve, and then place it in a mixing and drying kettle. Put a saturated solution of lithium hydroxide accounting for 2% of the mixture in the spray system, and control the spray system to the mixing and drying kettle. Spray, mix for 3 hours after spraying, so that the saturated solution of lithium hydroxide is evenly adsorbed on the surface of the mixture, continue to start the mixer, and place the aluminum sulfate whose content is just completely reacted with lithium hydroxide in the spray syste...

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PUM

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Abstract

The invention discloses a method for preparing a surface-coated anode material of a lithium battery. The method comprises the steps of: mixing an anode material, namely lithium iron phosphate, with lithium nickel cobaltate, magnesium nitrate and cobalt oxide, heating an obtained mixture to the temperature above a melting point of the magnesium nitrate for reaction, and then cooling; performing ball milling for crushing, and sieving; placing a lithium hydroxide saturated solution in a spraying system, controlling the spraying system to spay in a mixing drying kettle, continuously starting a mixer, placing aluminum sulfate which is in exact complete reaction with the lithium hydroxide into the spraying system, controlling the spraying system to spray into the mixing and drying kettle, continuously mixing after spraying to complete hydrolysis reaction uniformly; drying a mixture obtained after hydrolysis reaction; and carrying out thermal treatment, crushing and sieving to obtain the surface-coated anode material of the lithium battery. The surface-coated anode material prepared according to the invention is uniform in coating and thus has good cyclic stability and high-quality specific capacity, and is high in capacity, good in cyclic stability and long in service when applied to the lithium ion battery.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material for a battery, in particular to a method for preparing a positive electrode material coated on the surface of a lithium battery. Background technique [0002] Due to its high energy density and good cycle performance, lithium-ion batteries have been widely used since their commercialization, gradually replacing traditional chemical power sources such as lead-acid batteries. [0003] The technical bottleneck of lithium-ion batteries mainly lies in the cathode material. Currently used, 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 c...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCY02E60/12Y02E60/10
Inventor 姜波
Owner ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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