SILICON NANOPARTICLES, NON-AQUEOUS SECONDARY BATTERY NEGATIVE ELECTRODE ACTIVE MATERIAL USING SAID SILICON NANOPARTICLES, AND SECONDARY BATTERY

• Main Authors: KAWASE KENICHI, ZHU PEIXIN, IKUMA TAKAHITO, OOTSUKA SHUNICHI
• Format: Patent
• Language: Chinese; English
• Published: 30.07.2021
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

As silicon nanoparticles that greatly contribute to improved performance of a negative electrode active material, and the negative electrode active material that can provide a battery that combines excellent charge/discharge capacity, excellent initial coulomb efficiency, and an excellent capacity retention rate during repeated charge and discharge, provided are silicon nanoparticles for a lithium ion secondary battery negative electrode active material characterized in that the 29Si-NMR peak has a half value width of 20 ppm to 50 ppm with -80 ppm as the center, and broadens in a range of 50 ppm to -150 ppm, and in that the length in the long axis direction is 70 to 300 nm and the thickness is 15 to 70 nm or less, and a silicon based inorganic compound including those silicon nanoparticles. 作为能提供明显有助于提高负极活性物质的性能的硅纳米粒子和兼具优异的充放电容量、优异的首次库伦效率、优异的反复充放电时的容量维持率的电池的负极活性物质，本发明提供一种锂离子二次电池负极活性物质用硅纳米粒子和在内部包含该硅纳米粒子的硅系无机化合物，前述锂离子二次电池负极活性物质用硅纳米粒子的特征在于，29Si-NMR的峰以-80ppm为中心具有20ppm～50ppm的半值宽度且在50ppm～-150ppm的范围内变宽，并且长轴方向的长度为70～