METHOD FOR MANUFACTURING GRAPHITE POWDER FOR NEGATIVE-ELECTRODE MATERIAL FOR LITHIUM-ION SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM-ION SECONDARY BATTERY, AND LITHIUM-ION SECONDARY BATTERY

摘要

The present invention relates to a method for manufacturing graphite powder for a negative-electrode material for a lithium-ion secondary battery, said method including a step for crushing a graphite precursor, and a step for graphitizing by heating a mixture of the crushed graphite precursor and an alkali compound at a temperature between 2800-3500°C inclusive. The present invention provides a lithium-ion battery having both a high capacity and cycle characteristic, as well as little electrode expansion as a result of charging and discharging. The present invention also provides a negative-electrode material and a negative electrode for a lithium-ion battery having both a high capacity and low orientation for realizing said battery.