YS/T 1027-2015Lithium iron phosphate (English PDF)

4.6 Electrochemical performance

4.6.1 Initial discharge specific capacity

Under the voltage range of 2.5 V ~ 4.1 V and 0.1 C charge-discharge rate, the initial discharge specific capacity of products shall be not less than 140 mAh/g.

4.6.2 Initial charge-discharge efficiency

Under the voltage range of 2.5 V ~ 4.1 V and 0.1 C charge-discharge rate, the initial charge-discharge efficiency of products shall be not less than 85 %.

4.6.3 Cycle life

Under the voltage range of 2.5 V ~ 3.8 V and 1 C charge-discharge rate, when the discharge capacity of products reaches 80 % of the initial cycle discharge capacity, the number of cycles shall be not less than 2000 times.

5.1 Chemical composition

5.1.1 The determination of the chemical composition of products shall be carried out in accordance with the provisions of YS/T 1028.

5.1.2 The determination of the moisture of products shall be carried out in accordance with the provisions of GB/T 6283.

5.2 Appearance quality

The product appearance is examined visually.

5.3 Crystal structure

The crystal structure of products is examined using an X-ray powder diffractometer.

5.4 Physical properties

5.4.1 Tap density

The determination of the tap density of products shall be carried out in accordance with the provisions of GB/T 5162.

5.4.2 Particle size distribution

The determination of the particle size distribution of products is carried out in accordance with the provisions of GB/T 19077.1.

5.4.3 Specific surface area

The determination of the specific surface area of products is carried out in accordance with the provisions of GB/T 13390.

5.5 pH value

The determination of the pH value of products is carried out in accordance with the provisions of GB/T 1717.

5.6 Electrochemical performance

5.6.1 Initial discharge specific capacity

The determination of the initial discharge specific capacity of products is carried out in accordance with the provisions of GB/T 23365.

5.6.2 Initial charge-discharge efficiency

The determination of the initial charge-discharge efficiency of products is carried out in accordance with the provisions of GB/T 23365.

5.6.3 Cycle life

The determination of the cycle life of products is carried out in accordance with the provisions of GB/T 23366.

6.1 Inspection and acceptance

6.1.1 Products shall be inspected by the supply party. It shall ensure that the product quality complies with the provisions of this Standard and the contract (or order form), and it shall fill in the quality certificate.

6.1.2 The demand party shall inspect the received products in accordance with the provisions of this Standard. If the inspection results are inconsistent with the provisions of this Standard and the contract (or order form), it shall be submitted to the supply party in writing within three months from the date of receipt of the products, and the supply and demand parties shall negotiate and resolve. If arbitration is required, arbitration sampling will be carried out jointly at demand party’s.

6.2 Batch grouping

d) Net weight;

e) Moisture-proof words or logos;

f) Serial number of this Standard;

g) Date of production.

7.2 Packaging

The products that have passed the inspection are packed in a packaging unit of 25 kg (the packaging unit can also be specified in the contract). The inner packaging is composite aluminum-plastic bags, which are thermoplastic sealed and then put into cartons or fiber drums.

7.3 Transportation and storage

The products that have packaged in accordance with the requirements of 7.2 can be transported in various ways, but it shall avoid damage to the packaging and making the products damp. The products are suitable for sealed storage in an acid- and alkali-free atmosphere. There is no environmental humidity requirement when the inner packaging bag is sealed. The products have a shelf life of one year from the date of production under the required packaging conditions.

7.4 Quality certificate

Each batch of products shall be accompanied by a quality certificate, indicating.

a) Supply party’s name, address, telephone number, and fax number;

b) Product name;

c) Batch number;

d) Quantity;

e) Analysis and inspection results and stamps of supply party’s quality inspection department;

f) Serial number of this Standard;

g) Factory-exit date.