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Detection method for quickly evaluating relative content of residual alkalis on surface of ternary positive electrode material

A technology for the relative content of positive electrode materials, which is applied in the field of rapid evaluation of the relative content of residual alkali on the surface of ternary positive electrode materials. It can solve the problems of high requirements for detection and analysis personnel, high operation requirements, and long detection time, and achieve high detection flexibility. , reduce labor intensity and meet the effect of rapid detection

Inactive Publication Date: 2018-12-07
PULEAD TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of these methods are that the detection time of a single sample is long, the storage time of the standard solution is short, and the operation process has high requirements for detection and analysis personnel.
However, because the traditional detection of residual alkali content is the titration method, the detection time is long, the speed is slow, and the operation requirements are high, which cannot meet the requirements of rapid detection; and the titration method must detect the accurate content of each component of the residual alkali in order to further obtain The relative content of the total amount of residual alkali is not only cumbersome, but also the intermediate links cause great waste of financial, material and human resources

Method used

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  • Detection method for quickly evaluating relative content of residual alkalis on surface of ternary positive electrode material
  • Detection method for quickly evaluating relative content of residual alkalis on surface of ternary positive electrode material
  • Detection method for quickly evaluating relative content of residual alkalis on surface of ternary positive electrode material

Examples

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Embodiment 1

[0037] This embodiment provides a detection method for quickly evaluating the relative content of residual alkali on the surface of ternary cathode materials for a batch of 12 different ternary cathode materials synthesized by orthogonal experiments, wherein the test design includes three conditions A, B, and C , and each condition has three factors. A condition is the ratio of Li, A (1.03, 1.06, 1.10), and there are three factors in brackets; B condition is the primary sintering temperature, B (800°C, 840°C, 910°C); C condition is the sintering time, C ( 8h, 15h, 20h). Twelve ternary material samples were obtained through the combination of test conditions, and the 12 ternary cathode materials were sampled respectively (numbered as samples 1-12), and the relative carbon content was tested sequentially by an infrared absorption carbon-sulfur analyzer. Specifically, a certain amount of ternary cathode material samples to be tested and flux tungsten particles are firstly weighe...

Embodiment 2

[0052] This embodiment is aimed at the full temperature zone test of the roller kiln on the production line, and provides a detection method for quickly evaluating the relative content of residual alkali on the surface of the ternary cathode material. In this test, the roller kiln is a 4-column, 2-layer kiln, The full temperature zone test needs to continuously enter five rows (rows) of crucibles to occupy one temperature zone, so as to judge the impact of the heavy volume test on product performance according to the test results. The full temperature zone test is a process test that must be carried out before the ton-level full kiln test. During the test process, it is necessary to collect relevant data such as the surface residual alkali content of materials loaded in different rows of crucibles, different columns of crucibles, and different layers of crucibles, so as to accumulate process data for later full kiln tests and ensure the consistency of mass-produced products. In...

Embodiment 3

[0072] In order to further prove that the detection method provided by the present invention can greatly shorten the time, another example is provided here. This example provides a method for quickly evaluating the surface residue of ternary positive electrode materials for the pressure cooker test carried out by using a production line roller kiln. The detection method of the relative content of alkali, in this example, according to the test results, determine the capacity of the upper and lower lamination pots with the largest production capacity of the heavy-volume test and the residual alkali content of the sample not exceeding the specification. The number of upper and lower crucibles is the same as in Example 2, and the relative carbon content of each sample is tested by a non-aqueous titration carbon-sulfur analyzer. The flux is selected from iron particles, and fully reacts with oxygen in the reaction chamber of the electric arc furnace. The reaction time is 32s, and the...

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Abstract

The invention provides a detection method for quickly evaluating the relative content of residual alkalis on the surface of a ternary positive electrode material. The method comprises the following steps: respectively placing a plurality of ternary positive electrode material samples to be tested in crucibles in a reaction chamber, adding a flux, and performing heating and reacting in an oxygen atmosphere to generate carbon dioxide; and 2) detecting the relative content of carbon in carbon dioxide by a carbon content tester, and evaluating the relative content of residual alkalis on the surface of the ternary positive electrode material by using the relative content of carbon as an index. The method is used for some cases being not necessary to know the components of the residual alkalis but needing to know the relative content of the residual alkalis, is especially used for detecting a large batch of samples, is used for detecting the ternary positive electrode material by means of the carbon content tester, and can evaluate the relative content of the residual alkalis by detecting the surface residual alkalis. The method has the advantages of avoiding of the production of a standard solution, high detection flexibility, and great shortening of the detection time of a single sample.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries and the field of analysis and testing, and relates to a detection method for quickly evaluating the relative content of residual alkali on the surface of ternary positive electrode materials. Background technique [0002] Due to its unique energy density, cycle life, and safety performance, lithium-ion secondary batteries are currently widely used in 3C electronic devices and new energy vehicles. Due to its unique composition of solid solution, the ternary cathode material for lithium-ion batteries has both the advantages of lithium cobalt oxide and lithium manganese oxide, and the ratio can be adjusted according to different application requirements. [0003] The general formula of the ternary cathode material satisfies the Li α (Ni x co y mn z ) 1-a m a o 2 , usually, 0.90≤α≤1.10, 0.25≤x≤0.65, 0.15≤y≤0.35, 0.15≤z≤0.45, x+y+z=1, 0≤a≤0.01, M contains Co, Al, Mg , Zr, Mn, Ca, ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/162
Inventor 王欢欢黄震雷韩坤明陈全彬王海燕周恒辉杨新河
Owner PULEAD TECH IND