Cathode material precursor, preparation method thereof, cathode material and preparation method thereof

A technology of positive electrode materials and precursors, applied in the field of positive electrode materials and their preparation, and positive electrode material precursors, can solve the problems of reducing the rate performance of materials, affecting the effect of coating modification, reducing the conductivity of materials, etc., to achieve improved structural stability , prevent dissolution, reduce the effect of interface internal resistance

Active Publication Date: 2016-07-13
宁波富理电池材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The coating layer formed by this method is on the surface of the secondary particles of the material, and no effective coating layer is formed between the primary particles of the mat...

Method used

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  • Cathode material precursor, preparation method thereof, cathode material and preparation method thereof
  • Cathode material precursor, preparation method thereof, cathode material and preparation method thereof
  • Cathode material precursor, preparation method thereof, cathode material and preparation method thereof

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preparation example Construction

[0042] The present application also provides a method for preparing a positive electrode material precursor, comprising the following steps:

[0043] Mixing the nickel-containing compound, the cobalt-containing compound, and the manganese-containing compound with water to obtain a mixed solution, the molar ratio of the nickel ions in the nickel-containing compound, the cobalt ions in the cobalt-containing compound to the manganese ions in the manganese-containing compound is x :y: (1-x-y), where, 0≤x≤0.35, 0≤y≤0.35.

[0044] The mixed solution, complexing agent, precipitating agent and metal colloid precursor are mixed, and a positive electrode material precursor is obtained after reaction; the metal colloid precursor forms nano metal colloid in the mixed solution.

[0045] In the process of preparing the positive electrode material precursor, the present application first dissolves the nickel-containing compound, the cobalt-containing compound, and the manganese-containing co...

Embodiment 1

[0064] 1.1 Weigh 0.5mol of nickel sulfate and 1.5mol of manganese sulfate, dissolve them in 1L deionized water to make a mixed solution; weigh 4mol of sodium hydroxide and dissolve them in 1L of deionized water to make a precipitant; weigh 0.1mol Dissolve ammonia water in 1L deionized water to form a complexing agent, weigh 0.001mol aluminum chloride and 0.001mol magnesium chloride to obtain a metal colloid precursor;

[0065] 1.2 Add the mixed solution, precipitating agent, complexing agent and metal colloid precursor to the reaction container at the same time, carry out the coprecipitation reaction, and obtain the coprecipitation product;

[0066] 1.3 The co-precipitation product is washed and dried to obtain Ni containing nano-Al and nano-Mg sol particles. 0.25 mn 0.75 (OH) 2 Precursor;

[0067] 1.4 After mixing lithium carbonate and the above-mentioned precursor products according to the molar ratio of 0.51:1, heat treatment at 850°C for 16 hours, cool naturally, grind ...

Embodiment 2

[0071] 2.1 Weigh 0.48mol of nickel sulfate, 0.02mol of cobalt chloride, and 1.5mol of manganese sulfate, dissolve them in 1L of deionized water, and make a mixed solution; weigh 5mol of sodium hydroxide, dissolve them in 1L of deionized water, and make Precipitating agent; weigh 0.15mol of ammonia water and dissolve it in 1L of deionized water to form a complexing agent; weigh 0.002mol of aluminum sulfate and 0.001mol of titanic acid to obtain a metal colloid precursor;

[0072] 2.2 Add the mixed solution, precipitating agent, complexing agent and metal colloid precursor to the reaction container at the same time, carry out the co-precipitation reaction, and obtain the co-precipitation product;

[0073] 2.3 The co-precipitation product is washed and dried to obtain Ni particles containing nano-Al and Ti sol particles. 0.24 co 0.01 mn 0.75 (OH) 2 Precursor;

[0074] 2.4 After mixing lithium carbonate and the above-mentioned precursor products according to the molar ratio of...

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Abstract

The invention provides a preparation method of a cathode material precursor. The preparation method comprises the following steps of: mixing a nickel-containing compound, a cobalt-containing compound and a manganese-containing compound to obtain a mixed solution; mixing the mixed solution, a complexing agent, a precipitating agent and a metallic-colloid precursor, and reacting to obtain the cathode material precursor. In the process of preparing the cathode material precursor, nano metallic colloid forms double electrode layers on the surface of the precursor by co-precipitation reaction, so that the thickness increase of primary particles of the precursor is inhibited, the interlamellar spacing of a lamellar structure of the primary particles is reduced and the cathode material precursor of a lithium-ion battery aggregated by a hexagonal and lamellar structure is prepared. The application also provides a cathode material prepared by the cathode material precursor. The cathode material prepared by the application has the advantages that the hexagonal and lamellar primary particles have shorter lithium-ion migration path and better electrolyte wettability, so that the rate capacity of the cathode material can be increased, and the cathode material is especially applicable to manufacturing the lithium-ion power battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode material precursor, a preparation method thereof, and a positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in the electronics and communication industries, and are gradually being used in power batteries such as electric tools, electric vehicles, and hybrid vehicles. The battery safety performance and rate performance of lithium-ion batteries are also attracting more and more attention. . Studies have shown that the electrode reaction of lithium-ion batteries occurs at the electrode / electrolyte interface, so an effective way to improve the electrochemical performance of positive electrode materials is to coat the surface of the material. [0003] The Chinese patent application number 201410081429.8 discloses a high-voltage lithium nickel manganese oxide cathode...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 赛喜雅勒图刘兆平夏永高
Owner 宁波富理电池材料科技有限公司
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