Anode active material and battery
A negative electrode active material and battery technology, applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., to achieve high capacity, improved cycle characteristics, and superior cycle characteristics
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Embodiment 1-1 to 1-8
[0124] First, a negative electrode active material is formed. As raw materials, cobalt powder, tin powder, carbon powder, titanium powder, molybdenum powder, niobium powder, aluminum powder, germanium powder, phosphorus powder, bismuth powder, and indium powder were prepared. Next, in Example 1-1, cobalt powder, tin powder, and titanium powder were alloyed to form cobalt-tin-titanium alloy powder, and carbon powder was added thereto and dry-blended. In embodiment 1-2 to embodiment 1-6 and embodiment 1-8, cobalt powder and tin powder are alloyed to form cobalt-tin alloy powder, and carbon powder and molybdenum powder, niobium powder, aluminum powder, germanium powder , aluminum powder and phosphorus powder, or indium powder are added and dry mixed. In Examples 1-7, cobalt powder, tin powder and bismuth powder were alloyed to form cobalt-tin-bismuth alloy powder, and carbon powder was added thereto and dry-blended. The ratio of raw materials is shown in Table 1. Next, 20 g of...
Embodiment 2-1 and 2-2
[0149] The negative electrode active material and the secondary battery were formed as in Example 1-1, except that the synthesis conditions of the negative electrode active material were changed. The total rotation speed and run time were 300 rpm and 30 hours in Example 2-1, and 250 rpm and 25 hours in Example 2-2, respectively.
[0150] As comparative examples 2-1 to 2-4 with respect to Examples 2-1 and 2-2, negative electrode active materials and secondary batteries were formed as in Examples 2-1 and 2-2, except that the synthesis conditions of the negative electrode active materials were changed outside. The total rotation speed and running time were 150 rpm and 30 hours in Comparative Example 2-1, 200 rpm and 30 hours in Comparative Example 2-2, 250 rpm and 15 hours in Comparative Example 2-3, and 250 rpm and 20 hours in Comparative Examples 2-4, respectively.
[0151] For the negative electrode active material, XPS was performed, and the resulting peaks were analyzed. ...
Embodiment 3-1 and 3-2
[0156] A secondary battery was fabricated as in Example 1-1, except that the negative electrode active material was synthesized by changing the raw material ratios of cobalt, tin, carbon, and titanium as shown in Table 5. Specifically, the ratio of Co / (Sn+Co) was set at a constant value of 37% by weight, the raw material ratio of titanium was set at a constant value, and the raw material ratio of carbon was set at 10% by weight or 30% by weight.
[0157] table 5
[0158]
[0159] Co / (Sn+Co)=37% by weight
[0160] As Comparative Example 3-1 with respect to Examples 3-1 and 3-2, a negative electrode active material and a secondary battery were formed as in Examples 3-1 and 3-2, except that carbon powder was not used as a raw material. Also, as Comparative Example 3-2, a negative electrode active material and a secondary battery were formed as in Examples 3-1 and 3-2, except that the raw material ratio of carbon was 40% by weight.
[0161] For the negative electrode active m...
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