Lithium-iron disulfide lithium battery cathode material

Abstract

The invention discloses an anode material of a lithium-iron disulfide battery. The anode material comprises a modified iron disulfide anode active material which is iron disulfide doped with, by mass, 2% of titanium oxide, 4% of magnesium oxide and 6% of copper oxide. A preparation method of the anode active material specifically includes a) preparing first heat-treated iron disulfide, second heat-treated iron disulfide and third heat-treated iron disulfide; b) preparing first cladding iron disulfide, second cladding iron disulfide and third cladding iron disulfide; c) uniformly mixing the first cladding iron disulfide, the second cladding iron disulfide and the third cladding iron disulfide so as to obtain the anode material of the lithium-iron disulfide battery. The anode material of the lithium-iron disulfide battery has the advantages that open-circuit voltage of the battery can be reduced, so that a voltage platform is steadier; a composite electrically-conductive agent is added into the anode material, and accordingly electric conductivity can be improved greatly, battery polarization is reduced, high-and-low-temperature performance of the battery is enhanced and service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials. More specifically, the present invention relates to a lithium-iron disulfide lithium battery positive electrode material obtained by adding modified iron disulfide. Background technique [0002] The lithium-iron disulfide battery is a high-energy and environmentally friendly primary battery with iron disulfide as the positive active material and lithium ion as the negative active material. It has many advantages that traditional primary batteries cannot match: high and stable discharge voltage; large discharge capacity; High specific power and large discharge current; the lightest weight among the same type of battery products; wide operating temperature range; good high temperature storage performance; good leak-proof performance; long storage life; no mercury, no cadmium, no battery Lead is a green, safe and reliable new energy storage device. Because of its excellent perfor...

AI Technical Summary

Problems solved by technology

The positive electrode material of lithium-iron disulfide battery, iron disulfide, is usually separated and purified from pyrite. The battery assembled with the newly obtained iron disulfide as a material has a high open circuit voltage, poor voltage platform and high-current discharge performance. , in order to improve the voltage platform and discharge performance, it is necessary to modify the active material iron disulfide. In the existing technology, the treatment of iron disulfide has a single method, the effect is not obvious, and the process is complicated and cumbersome; in addition, as the positive electrode The performance of the conductive agent, one of the components of the material, also has an extremely important impact on the discharge performance of the battery.