A lithium supplemental additive and a lithium ion battery for improving the efficiency of a silicon-carbon negative electrode material

Abstract

A lithium ion battery for improving the efficiency of a silicon-carbon negative electrode material, including steel shells, the steel shell comprises an outer shell, A negative electrode and a spacer,The enclosure, the negative electrode and the spacer are annular. and are successively socketed together, At that top and bottom of the house, the negative electrode and spacer are cover with insulators, the inside of the spacer layer is covered with the positive electrode and the insulating plate which are staggered with each other, Effect of Adding Li3Ti2 (PO4) 3 Material: During the first charge, after the lithium in the positive electrode active material lithium nickel cobalt manganate is completely removed and the electrolyte is embedded into the negative electrode, The added Li3Ti2 (PO4) 3 continues to provide lithium for the electrochemical reaction of the battery, The irreversible lithium loss caused by the change of silicon-carbon structure due to the formation of negative electrode SEI film is supplemented, so as to improve the first capacity of the battery, and the irreversible lithium loss caused by the change of volume structure of silicon-carbon negative electrode is supplemented, so as to improve the first efficiency of the battery and optimize the electric performance of the battery, and the first efficiency is obviously higher.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a lithium-supplementing additive and a lithium-ion battery for improving the efficiency of a silicon-carbon negative electrode material. Background technique [0002] With the vigorous development of the current new energy industry, it has become the common goal of everyone in the industry to continuously increase the energy density of batteries to increase the cruising range of new energy vehicles. At present, graphite negative electrodes (artificial graphite and natural graphite) are mostly used as negative electrode materials in the industry. In the process of battery theoretical design, the achievable energy density has basically been fully utilized. Therefore, the current graphite negative electrode materials can improve battery energy density. A clear bottleneck has been encountered. Compared with graphite anode materials, silicon-based anode materials have obvious advantages in en...

AI Technical Summary

Problems solved by technology

Therefore, the application of silicon negative electrode can increase the content of active material in the battery, thereby greatly increasing the capacity of the single cell, but the pure silicon negative electrode undergoes a huge volume change during charging and discharging, which seriously affects the performance of the battery.

Later, after research, it was found that silicon-carbon composite materials can improve the volume expansion of pure silicon negative electrodes during charge and discharge, but there is still the problem of low initial discharge efficiency, which affects the capacity of the battery.

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