In this paper, we will analyze the properties and applications of artificial graphite negative electrode. We use two different kinds of petroleum coke as raw materials. By changing the coating process under the same process conditions, we produced artificial graphite negative electrode materials with different coating modes. By studying and comparing the performance differences, we discussed the effect of coating mode on the properties, advantages and disadvantages of artificial graphite negative electrode materials for lithium-ion batteries. The results show that the artificial graphite negative electrode material of lithium-ion battery produced by front coating mode has the characteristics of high capacity. And the artificial graphite negative electrode material of lithium-ion battery produced by rear coating mode has relatively excellent cycling performance.

We briefly explain the purity detection method of graphite negative electrode material for lithium-ion battery. The purity of graphite negative electrode material was determined by X-ray diffraction K method with α-Al2O3 as reference material. By using of graphite (2θ= 26.57°) diffraction peak and α-Al2O3 (2θ= 35.15 °) diffraction peak as measured peaks, we achieve K=20.58. By using this method, we measure the graphite samples with known purity, and find that the test value of purity is consistent with the actual value. The method is easy to operate, and has high speed. And its relative standard deviation is 1.69%. Therefore, we think this method can meet the working requirements of graphite material quality supervision.

The effect of graphite negative electrode on low temperature charging performance of lithium-ion battery is discussed. The low temperature charging performance of conventional lamellar artificial graphite negative electrode (XFH) and secondary granulated graphite negative electrode (SS) was studied, and the characterization methods of lithium evolution at low temperature for lithium-ion batteries were proposed. Comparing with the conventional negative electrode, the secondary granulated graphite negative electrode is more beneficial to improve the charging performance of lithium-ion battery at low temperature.

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