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GB/T 23365-2009 English PDF (GBT23365-2009)

GB/T 23365-2009 English PDF (GBT23365-2009)

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GB/T 23365-2009: Electrochemical performance test of lithium cobalt oxide -- Test method for specific capacity and charge-discharge efficiency of the first cycle

This standard specifies the test methods for specific capacity and charge-discharge efficiency of the first cycle of lithium cobalt oxide, for the cathode material of lithium ion batteries. This standard applies to lithium cobalt oxide, for the cathode material of lithium ion batteries.
GB/T 23365-2009
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.120.99
H 71
Electrochemical performance test of lithium cobalt oxide -
Test method for specific capacity and charge-discharge
efficiency of the first cycle
ISSUED ON: MARCH 19, 2009
IMPLEMENTED ON: JANUARY 01, 2010
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Reagents and raw materials ... 4
3 Instruments ... 4
4 Test steps ... 5
5 Data processing ... 6
6 Test report ... 6
Electrochemical performance test of lithium cobalt oxide -
Test method for specific capacity and charge-discharge
efficiency of the first cycle
1 Scope
This standard specifies the test methods for specific capacity and charge-discharge efficiency of the first cycle of lithium cobalt oxide, for the cathode material of lithium ion batteries.
This standard applies to lithium cobalt oxide, for the cathode material of lithium ion batteries.
2 Reagents and raw materials
2.1 Lithium hexafluorophosphate (LiPF6) (for lithium batteries).
2.2 Ethylene carbonate (EC) (for lithium batteries).
2.3 Diethyl carbonate (DEC) (for lithium batteries).
2.4 N-methylpyrrolidone (NMP) (for lithium batteries).
2.5 Polyvinylidene fluoride (PVdF) (for lithium batteries).
2.6 Acetylene black.
2.7 Aluminum foil, which has a thickness of 10 ??m ~ 25 ??m.
2.8 Metal lithium sheet, which has a thickness of 0.10 mm ~ 0.25 mm.
2.9 Microporous polypropylene separator (for lithium batteries).
2.10 Lithium cobalt oxide.
3 Instruments
3.1 Mechanical stirrer.
3.2 Incubator.
3.3 Oven.
3.4 Inert gas glove box: The content of water and oxygen is less than or equal to 0.0005%.
3.5 Lithium-ion battery electrochemical performance tester.
3.6 Balance: Accurate to 0.0001 g.
3.7 Spiral micrometer (micrometer).
3.8 Small coating machine.
3.9 Slicer.
4 Test steps
4.1 Preparation of positive electrode sheet
The mass fraction of lithium cobalt oxide (2.10), in the cathode material, is 85% ~ 95%. Use the acetylene black (2.6), as a conductive agent; its mass fraction is 2% ~ 10%; Use the polyvinylidene fluoride (2.5), as a binder; its mass fraction is 2% ~ 10%. The mass is accurate to thousandth. The positive electrode sheet is made of aluminum foil as the current collector. Stir the lithium cobalt oxide, acetylene black, polyvinylidene fluoride, and N-methylpyrrolidone (2.4), to adjust the slurry. Then evenly coat the slurry on aluminum foil. Dry it in an oven, at 120 ??C. Strictly control the process of mixing and coating. The coating thickness of the electrode sheet to be tested shall be uniform. Cut it into electrode sheets, which have a diameter of 10 mm ~ 25 mm AND a thickness of 0.08 mm ~ 0.12 mm. Weigh the electrode sheet; the mass is accurate to one ten thousandth.
4.2 Assembly of battery
In an inert gas glove box, which has a water and oxygen content less than or equal to 0.0005%, use the metal lithium sheet as negative electrode material; use polypropylene microporous film (2.9) as separator; use the 1 mol/L LiPF6 (2.1) /EC (2.2) + DEC (2.3) (mass ratio 1:1), as the electrolyte. Assemble them into test batteries. After the batteries are sealed, they are tested by a lithium-ion battery electrochemical performance tester. 4.3 Test of battery
Place the fabricated test battery, into a constant temperature chamber, at 25 ??C ?? 1 ??C. Use a lithium-ion battery electrochemical performance tester, to perform test. The charge-discharge system is as follows:
- Charging limit voltage: 4.30 V;

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