GB/T 43093-2023Electrochemical performance test of lithium nickel manganese oxide - Test method for the initial discharge specific capacity and initial efficiency (English PDF)

Foreword

This document was issued on 7 September 2023 by the State Administration for Market Regulation; Standardization Administration of the PRC and takes effect on 1 April 2024.

It is a GB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

1 Scope

GB/T 43093-2023 gives the test method for the first discharge specific capacity and first charge-discharge efficiency of lithium nickel manganese oxide cathode material. LNMO is the cobalt-free high voltage spinel that the industry has pursued for years because it removes the most expensive and most contested element from the cathode; its difficulty is the 4.7 volt plateau, which oxidises ordinary electrolyte, so the first cycle loses more capacity than in other chemistries and the first-cycle efficiency is the number that most directly predicts what the material will do in a cell. The standard sets the reagents and materials, the instruments and equipment, the test procedure for assembling and cycling the half cell, the processing of the test data, the permitted differences between determinations and the test report. It took effect on 1 April 2024.

This document describes the test method for the initial discharge specific capacity and initial

charge and discharge efficiency of lithium nickel manganese oxide - lithium-ion battery positive

electrode material.

This document is applicable to the test of the initial discharge specific capacity and initial charge

and discharge efficiency of lithium nickel manganese oxide - lithium-ion battery positive

electrode material. The test method includes button-type half-cell method and button-type full-

cell method.

2 Normative References

This document does not have normative references.

3 Terms and Definitions

This document does not have terms or definitions that need to be defined.

4 Reagents and Materials

4.1 Lithium nickel manganese oxide: spinel type.

4.2 Artificial graphite negative electrode material.

4.3 Lithium-ion battery electrolyte: high-voltage resistant type, with a moisture content not

greater than 0.002%, free acid (HF) not greater than 0.005%, and electrical conductivity (25 C)

not less than 7.0 mS/cm.

4.4 Ethanol: industrial grade.

4.5 Binder: polyvinylidene fluoride (PVDF), battery grade, with a weight-average molecular

weight not less than 5  105 and moisture content not greater than 0.10%; sodium

carboxymethylcellulose (CMC), battery grade, with a viscosity of 500 mPa  s ~ 1,200 mPa 

s; styrene-butadiene rubber (SBR) emulsion.

4.6 N-methylpyrrolidone (NMP): battery grade, with a purity not less than 99.9% and a moisture

5.11 Inert atmosphere (argon) glove box: with a moisture content and oxygen content not

greater than 0.0001%.

5.12 Button-type battery packaging machine.

5.13 Lithium-ion battery electrochemical performance tester: with a current and voltage full-

scale accuracy of 0.1%.

5.14 Thermostat: with a temperature of 25 C  1 C and a relative humidity less than 40%.

5.15 Pre-treatment drying room: with a temperature of 25 C  2 C and a relative humidity

less than 5%.

5.16 Desktop digital display thickness gauge: with a resolution of 1 m.

5.17 Myriameter.

5.18 Tweezers.

5.19 Insulated tweezers.