Method for preparing high-nickel positive electrode material and high-nickel positive electrode material obtained by using same

A positive electrode material, high-nickel technology, applied in the field of lithium-ion batteries, can solve the problems of long washing and coating time, storage and safety performance, low capacity, etc., to reduce the amount of residual lithium on the surface, improve thermal stability, excellent The effect of cycle performance

Active Publication Date: 2019-03-05
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the positive electrode materials suitable for lithium-ion power batteries on the market mainly include lithium iron phosphate, lithium manganese oxide, lithium nickel cobalt manganate and lithium nickel cobalt aluminate, etc., but due to lithium iron phosphate, lithium manganate and conventional nickel cobalt manganese The capacity of lithium-acid batteries is low, which cannot meet the requirements of my country's 2020 power battery capacity of 300wh / kg. Therefore, high-capacity and high-power high-nickel ternary cathode materials have become the most popular power battery cathode materials.
[0003] Ternary cathode materials, especially high-nickel ternary cathode materials, generally have problems with storage and safety performance
Although the effect of this method for removing residual lithium on the surface is good, this process not only requires low temperature, but also requires a long washing and coating time, for example, the time of washing and coating with boric acid is as long as 1 hour
Obviously, this is bad for industrial production and significantly increases production costs
Moreover, the positive electrode material produced by this coating method has a limited battery capacity and cannot meet the use requirements

Method used

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  • Method for preparing high-nickel positive electrode material and high-nickel positive electrode material obtained by using same
  • Method for preparing high-nickel positive electrode material and high-nickel positive electrode material obtained by using same
  • Method for preparing high-nickel positive electrode material and high-nickel positive electrode material obtained by using same

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preparation example Construction

[0036] In the preparation of the matrix according to step a) of the present invention, it is also possible to dope the matrix with other metals. As an example of other doped oxides, Al can be given 2 o 3 , ZrO 2 、TiO 2 , MgO, ZnO in one or more than two. The amount of other doping oxides can also be determined according to the required doping amount of other metals. In an embodiment of the present invention, the addition amount of other doping metal oxides is such that the amount of other doping metals is in the range of 100-2000 ppm relative to the total weight of the matrix.

[0037] In a specific embodiment according to the present invention, step a) is carried out as follows: first, feed the high-nickel ternary precursor, lithium hydroxide, boron-containing compounds and other doping oxides into the mixing device, and then add The mixing medium is mixed, the weight ratio of the total weight of the material to the mixing medium is 1: (0.5-2), and the mixing time is 0.5...

Embodiment

[0054] In order to facilitate understanding of the present invention, the present invention enumerates the following examples. Those skilled in the art should understand that the examples are only used to help understand the present invention, and should not be regarded as a specific limitation of the present invention.

[0055] testing method

[0056] Surface residual lithium test method:

[0057] Acid-base titration method: add 30g sample into 100ml pure water, stir for 30min, let it stand for 5min, filter with suction, take 10ml supernatant, and titrate the lithium carbonate dissolved from the positive electrode material with 0.05mol / L hydrochloric acid standard solution And lithium hydroxide, the pH electrode is used as the indicator electrode, and the end point is determined by means of the jump generated by the potential change, and the amount of residual lithium on the surface of the positive electrode material is calculated.

[0058] Initial gram capacity test method...

Embodiment 1

[0069] Add high nickel ternary precursor, lithium hydroxide, B 2 o 3 And zirconia to the oblique mixer, the molar ratio Li / Me of the ternary precursor and lithium hydroxide is 1.05, B 2 o 3 Add the amount so that the B content is 1000ppm, the weight ratio of the added zirconia is 0.2%, add polytetrafluoroethylene balls, the ratio of the total weight of the material to the weight of the polytetrafluoroethylene balls is 1:1, and the mixing time is 1h, and the initial Sintered materials, wherein: the high-nickel ternary precursor is [Ni 0.8 co 0.1 mn 0.1 ](OH) 2 . Put the prepared materials into the atmosphere roller furnace for sintering, the sintering temperature is 830°C, and the sintering atmosphere is O 2 , O 2 The concentration is 80%, the sintering time is 15h, and the high-nickel ternary positive electrode base material is obtained, and its initial capacity is 201mAh / g. Weigh a certain amount of H 3 BO 3 Add it to deionized water to make 1mol / L H 3 BO 3 solut...

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Abstract

The invention discloses a method for preparing a high-nickel positive electrode material and the high-nickel positive electrode material obtained by using the same. The method comprises the followingsteps: (i) doping a substrate with a boron-containing compound so as to obtain a boron-doped substrate; and (ii) coating the boron-doped substrate through the following steps: washing and coating theboron-doped substrate with an aqueous solution containing the boron-containing compound at a temperature of larger than 10 DEG C, and carrying out heat treatment so as to form the high-nickel positiveelectrode material. The high-nickel positive electrode material obtained by using the method provided by the invention has extremely-low surface residual lithium amount, low pH value and excellent stability, and can improve the capacity, cycle, safety, and storage properties of a lithium-ion battery.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery, in particular to a method for preparing a high-nickel positive electrode material and a high-nickel positive electrode material obtainable by the method. The present invention also relates to a lithium-ion battery formed from the high-nickel positive electrode material. Background technique [0002] Lithium-ion batteries are gradually being used in automotive power systems due to their high energy and power density, long cycle life and other advantages. At present, the positive electrode materials suitable for lithium-ion power batteries on the market mainly include lithium iron phosphate, lithium manganese oxide, lithium nickel cobalt manganate and lithium nickel cobalt aluminate, etc., but due to lithium iron phosphate, lithium manganate and conventional nickel cobalt manganese The low capacity of lithium-acid batteries cannot meet the requirements of my country's power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 吴奇何金华
Owner CONTEMPORARY AMPEREX TECH CO
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