SILICON NANOPARTICLES, ACTIVE MATERIAL FOR NEGATIVE ELECTRODE OF NON-AQUEOUS SECONDARY BATTERY INCLUDING THE SAME, AND SECONDARY BATTERY

• Main Authors: OTSUKA SHUNICHI, KAWASE KENICHI, SHO BAISHIN, IKUMA TAKAHITO
• Format: Patent
• Language: English; Japanese
• Published: 05.08.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To obtain a sheet-like silicon nanoparticle that contributes greatly to the improvement of the performance of a negative electrode active material, and a negative electrode active material that can provide a battery with excellent charge-discharge capacity, excellent first-time coulomb efficiency, and excellent capacity maintenance rate during repeated charge-discharge.SOLUTION: The present invention is related to sheet-like silicon nanoparticles for negative electrode active material of a lithium-ion secondary battery, characterized in that the 29Si-NMR peak is centered at -80 ppm with a half-width of 20 ppm to 50 ppm and broadens in the range of 50 ppm to -150 ppm, and that the length in the long axis direction is 70 to 300 nm and the thickness is 15 to 70 nm or less.SELECTED DRAWING: Figure 1 【課題】 負極活物質の性能向上に大きく寄与するシート状シリコンナノ粒子及び優れた充放電容量、優れた初回クーロン効率、優れた繰り返し充放電時の容量維持率を兼備する電池を提供できる負極活物質を得る。【解決手段】 本発明は、２９Ｓｉ−ＮＭＲのピークが-８０ｐｐｍの中心に２０ｐｐｍ〜５０ｐｐｍの半値幅を有し且つ５０ｐｐｍ〜−１５０ｐｐｍの範囲にブロードし、尚且つ、長軸方向の長さが７０〜３００ｎｍかつ厚みが１５〜７０ｎｍ以下にあることを特徴とするリチウムイオン二次電池負極活物質用シート状シリコンナノ粒子に関する。【選択図】 図１