GB/T 41704-2022 PDF English
US$230.00 · In stock · Download in 9 secondsGB/T 41704-2022: Test methods of cathode materials for lithium ion battery - Determination of magnetic impurities content and residual alkali content Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 41704-2022 | English | 230 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Test methods of cathode materials for lithium ion battery - Determination of magnetic impurities content and residual alkali content
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 41704-2022
GB/T 41704-2022: Test methods of cathode materials for lithium ion battery - Determination of magnetic impurities content and residual alkali content
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT41704-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
CCS H 16
Test Methods of Cathode Materials for Lithium Ion Battery
- Determination of Magnetic Impurities Content and
Residual Alkali Content
Issued on. OCTOBER 12, 2022
Implemented on. FEBRUARY 1, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Determination of Magnetic Impurities Content... 6
5 Determination of Residual Alkali Content... 13
6 Test Report... 17
1 Scope
This document specifies the determination method for magnetic impurities content and residual
alkali content in the cathode materials for lithium ion battery.
This document is applicable to the determination of magnetic impurities content and residual
alkali content in the cathode materials for lithium ion battery. The determination range of the
magnetic impurities content is 1 g/kg; the determination range of residual alkali content
(mass fraction) is 0.001% ~ 2.500%.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in this text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 601 Chemical Reagent - Preparations of Standard Volumetric Solutions
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of
Limiting Values
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Magnetic Impurities
Magnetic impurities refer to impurities in the cathode materials for lithium ion battery that can
be adsorbed by the magnetic bar with a magnetic induction intensity of not less than 0.5 T
(5,000 Gauss).
3.2 Large Particle Magnetic Impurities
Large particle magnetic impurities refer to magnetic impurities with a diameter of not less than
10 m under the scanning electron microscope.
3.3 Residual Alkali
Residual alkali refers to alkaline substances attached to the surface of the particles of the
cathode materials for lithium ion battery.
4 Determination of Magnetic Impurities Content
4.1 Inductively Coupled Plasma Atomic Emission Spectrometry
4.1.1 Principle
In a clean environment free of magnetic impurities, use a magnetic bar to adsorb and enrich the
magnetic impurities in the cathode material.
4.1.2 Reagents or materials
Unless it is otherwise specified, all reagents used in this Method are of guaranteed purity and
Grade-1 water specified in GB/T 6682.
4.1.2.1 Nitric acid ( = 1.42 g/mL).
4.1.2.6 Zinc standard stock solution (100 g/mL), prepared from high-purity metals or
compounds, or adopt a certified single-element standard stock solution.
4.1.2.7 Lithium standard stock solution (100 g/mL), prepared from high-purity metals or
compounds, or adopt a certified single-element standard stock solution.
4.1.2.11 Lithium standard solution B. transfer-take 20.00 mL of lithium standard solution A
(4.1.2.10); place it in a 100 mL volumetric flask. Add 3 mL of nitric acid (4.1.2.1); use water to
dilute to the scale; mix it well and immediately transfer it to a dry plastic jar. 1 mL of this
solution contains 2 g of lithium.
4.1.3 Instruments and equipment
4.1.3.1 Environmental iron removing rod. magnetic induction intensity 0.5 T (5,000 Gauss),
wrapped with plastic wrap.
4.1.3.2 Plastic jar. 500 mL.
4.1.4 Sample
The particle of the sample shall be not greater than 0.154 mm.
4.1.5 Test procedures
4.1.5.1 Iron removal before test
Before the test, use aqua regia (4.1.2.2) to clean the magnetic bar (4.1.3.3); use the
environmental iron removing rod (4.1.3.1) to carry out meticulous iron removal treatment on
all instruments and supplies used in the test.
4.1.5.4.1 Put the test portion in a 500 mL plastic jar (4.1.3.2), add 300.0 g of water, tighten the
lid (to prevent leakage); place it on the ball mill (4.1.3.5), adjust the rotating speed to 60 r/min
~ 100 r/min; after rolling and mixing for 30 min, remove it.
4.1.5.4.3 Transfer the magnetic bar (4.1.3.3) to a clean 200 mL beaker; add water, until the
magnetic bar (4.1.3.3) is immersed; prevent the water from directly rushing to the surface of
the magnetic bar (4.1.3.3).
4.1.5.4.4 There are two optional modes for dissolution.
4.1.5.4.5 Remove the beaker or colorimetric tube. After cooling, transfer all the solution to a 50
mL volumetric flask. Use a small amount of water to rinse the magnetic bar (4.1.3.3); repeat
for 3 times. Then, transfer all the washing solution to a volumetric flask and use water to reach
a constant volume; record the volume as V.
4.1.5.5 Preparation of standard series solutions
4.2.5.2 Weigh-take 200.0 g of the sample, accurate to 0.1 g. Place the sample in a 500 mL plastic
jar (4.2.3.3); add water to the shoulder of the jar; tighten the lid, then, use the sealing film to
seal it. Manually mix the water and the sample, so that there is no precipitation at the bottom of
the jar. Put the jar into the magnetic ring sleeve (4.2.3.2); use the heat sealing film to seal it.
Place it on the ball mill (4.2.3.4); after mixing it for 30 min, remove it.
4.2.5.3 After removing it, with the magnetic ring sleeve (4.2.3.2), pour out the water and
material in the plastic jar (4.2.3.3); use water to repeatedly rinse the wall of the jar for more
than 5 times, so as to ensure that there is no precipitation of sample at the bottom of the jar.
4.2.5.4 After assembling the filter film (4.2.2.3) and vacuum filtration device (4.2.3.6), remove
the magnetic ring sleeve (4.2.3.2); use water to rinse the wall of the plastic jar (4.2.3.3) for more
than 3 times. Pour the washing solution into the vacuum filtration device (4.2.3.6); use water to
rinse the wall of the suction and filtration cup for more than 3 times.
4.2.6 Processing of test data
Count the number of large particle magnetic impurities. Respectively count the number of iron
and stainless steel (iron-chromium-nickel).
5 Determination of Residual Alkali Content
5.1 Principle
Use a certain volume of water to dissolve the residual alkali on the surface of the sample with
a certain mass. After filtration, take the filtrate; use the standard titration solution of
hydrochloric acid to perform titration.
5.2 Reagents or Materials
Unless it is otherwise specified, all reagents used in this Method are of guaranteed purity and
Grade-1 water specified in GB/T 6682.
5.2.1 Standard titration solution of hydrochloric acid. 0.1 mol/L. Adopt a nationally recognized
certified reference material within the validity period, or prepare it in accordance with the
stipulations of GB/T 601.
5.2.2 Plastic wrap.
5.3 Instruments and Equipment
5.4 Sample
The particle of the sample shall be not greater than 0.154 mm.
5.5 Test Procedures
5.6 Processing of Test Data
5.6.1 The residual lithium carbonate content in the sample, in mass fraction wLi2CO3, shall be
calculated in accordance with Formula (4).
5.6.2 The residual lithium hydroxide content in the sample, in mass fraction wLiOH, shall be
calculated in accordance with Formula (5).
5.6.3 The residual alkali content in the sample, in mass fraction wra, shall be calculated in
accordance with Formula (6).
5.6.4 The residual lithium content in the sample, in mass fraction wrl, shall be calculated in
accordance with Formula (7).
5.6.5 The calculation results shall be expressed in three decimal places and rounded off in
accordance with the stipulations of GB/T 8170.
5.7 Precision
5.7.1 Repeatability
In terms of the measured values of two independent test results obtained under repeatability
conditions, within the range of average values provided in Table 2, the absolute difference
between the two test results does not exceed the repeatability limit (r), and the circumstance of
exceeding the repeatability limit (r) does not exceed 5%. The repeatability limit (r) is obtained
through linear interpolation or extrapolation in accordance with the data in Table 2.
6 Test Report
The test report shall include the following aspects.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 41704-2022 be delivered?Answer: The full copy PDF of English version of GB/T 41704-2022 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 41704-2022_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 41704-2022_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 41704-2022 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. How to buy and download a true PDF of English version of GB/T 41704-2022?A step-by-step guide to download PDF of GB/T 41704-2022_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 41704-2022".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|