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Cathode material for lithium-ion battery, preparation method of cathode material and battery

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of insufficient cycle performance and rate performance, high cost, improve reversible specific capacity, reduce corrosion , the effect of increasing the cycle performance

Active Publication Date: 2015-04-29
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the ternary materials widely used in commerce are new materials developed to meet the performance and cost improvement requirements of existing lithium-ion battery cathode materials. They have the advantage of high discharge specific capacity, but the current ternary materials still have cycle performance and The rate performance is slightly insufficient, and the cost is high

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  • Cathode material for lithium-ion battery, preparation method of cathode material and battery

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Embodiment 1

[0042] This embodiment provides a method for preparing a positive electrode material for a lithium-ion battery, comprising the following steps:

[0043] (1) Using nickel sulfate, cobalt sulfate, and manganese sulfate as raw materials, configure the first mixed aqueous solution of the first metal salt according to the ratio of substances Ni: Co: Mn = 0.5: 0.25: 0.25. All metals in the first mixed aqueous solution The total concentration of salt was 3M. Add the first mixed aqueous solution, 10M sodium hydroxide of the first precipitating agent, and 10M ammonia water of the first complexing agent to the 2M ammonia water of the first bottom liquid, and put it in a water bath at 80°C for 24 hours, with a stirring speed of 1000rpm, and the first mixed aqueous solution The first metal salt in the precipitate is precipitated, and the precipitate is filtered, washed and dried to obtain the first precipitate.

[0044] (2) Using nickel sulfate, cobalt sulfate, manganese sulfate, and alu...

Embodiment 2

[0051] This embodiment provides a method for preparing a positive electrode material for a lithium-ion battery, comprising the following steps:

[0052] (1) Using nickel nitrate, cobalt nitrate, and manganese nitrate as raw materials, configure the first mixed aqueous solution of the first metal salt according to the ratio of substances Ni:Co:Mn=0.55:0.2:0.25, and all the metals in the first mixed aqueous solution The total concentration of salt was 1M. Add the first mixed aqueous solution, the first precipitating agent 5M sodium hydroxide, and the first complexing agent 8M ammonium nitrate to the first bottom liquid 1M ammonium nitrate, and put it in a water bath at 60°C for 12h, with a stirring speed of 800rpm, the first The first metal salt in the mixed aqueous solution is precipitated, and the precipitate is filtered, washed and dried to obtain the first precipitate.

[0053] (2) Using nickel nitrate, cobalt nitrate, manganese nitrate, and aluminum nitrate as raw material...

Embodiment 3

[0057] This embodiment provides a method for preparing a positive electrode material for a lithium-ion battery, comprising the following steps:

[0058] (1) Using nickel acetate, cobalt acetate, and manganese acetate as raw materials, configure the first mixed aqueous solution of the first metal salt according to the ratio of substances Ni: Co: Mn = 0.4: 0.3: 0.3, and all metals in the first mixed aqueous solution The total concentration of salt was 0.1M. Add the first mixed aqueous solution, the first precipitant 1M potassium carbonate, and the first complexing agent 6M ammonia water to the ammonia water with a pH value of 9 in the first bottom liquid, and put it in a water bath at 40°C for 6 hours, with a stirring speed of 600rpm. The first metal salt in the mixed aqueous solution is precipitated, and the precipitate is filtered, washed and dried to obtain the first precipitate.

[0059] (2) Using nickel acetate, cobalt acetate, manganese acetate, and aluminum acetate as ra...

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Abstract

The invention discloses a cathode material for a lithium-ion battery, a preparation method of the cathode material and the battery. The material adopts the structure that a lithium-nickel-cobalt-manganese material used as the core is coated with an aluminum-doped lithium-nickel-cobalt-manganese material, the molecular formula of the lithium-nickel-cobalt-manganese material used as the core is Lim(Ni1-x-yCoxMny)O2, the molecular formula of the aluminum-doped lithium-nickel-cobalt-manganese material for coating is Lim(Ni1-x-y-zCoxMnyAlz)O2, m is larger than or equal to 1 and smaller than or equal to 1.4, x is larger than or equal to 0.05 and smaller than or equal to 0.35, y is larger than or equal to 0.1 and smaller than or equal to 0.4, and z is larger than 0 and smaller than or equal to 0.08. A shell layer of the cathode material is doped with aluminum, so that on one hand, the usage amount of cobalt in the whole cathode material adopting the core-shell structure is reduced, and the cost is reduced; on the other hand, corrosion caused by an electrolyte to the lithium-nickel-cobalt-manganese material used as the core can be reduced due to the aluminum in the shell layer, so that the reversible specific capacity of the lithium-ion battery made of the cathode material can be improved, and the cycle performance of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery [0002] Cathode material, preparation method thereof, and battery. Background technique [0003] Since Japan's Sony Corporation put lithium cobalt oxide batteries on the market in 1991, lithium-ion secondary batteries have played an important role in various fields, and battery materials are also in continuous development. Various specific lithium-ion battery cathode materials have appeared one after another, such as manganese Lithium Oxide, Lithium Nickel Oxide, Lithium Ferrous Phosphate, Nickel Cobalt Manganese Ternary, etc. With the popularization of electronic products, people have higher and higher requirements for lithium-ion batteries, requiring batteries that last longer, are smaller in size, and weigh less in weight. Since the energy density of lithium-ion batteries can be divided into volumetric energy density and gravimetric energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M10/42
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 卢磊海滨朱广燕刘三兵翟丽娟陈效华
Owner CHERY AUTOMOBILE CO LTD
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