NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY USING THE SAME

• Main Authors: HIRANO NOBUHIRO, NAGURA KENSUKE, HOSOKAWA NAOSHI
• Format: Patent
• Language: English; Japanese
• Published: 12.03.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a negative electrode for lithium ion secondary batteries superior in battery characteristics including high output and high capacity.SOLUTION: A negative electrode for lithium ion secondary batteries comprises: a current collector; and a layer formed on the current collector and including an active material. The active material contains a carbon material and metal oxide; the metal oxide has an average particle diameter equal to or smaller than one tenth of that of the carbon material. The surface of the carbon material is at least partially covered with a metal oxide; the coverage of the metal oxide over the carbon material is 30-70%. 【課題】電池の高出力、高容量特性に優れたリチウムイオン二次電池用負極を提供する。【解決手段】集電体と、前記集電体の上に形成された活物質を含む層を備えたリチウムイオン二次電池用負極であって、活物質が炭素材料と金属酸化物とからなり、金属酸化物の平均粒径は炭素材料の平均粒径の１／１０以下であり、炭素材料の表面の少なくとも一部が金属酸化物で被覆されており、金属酸化物の炭素材料に対する被覆率が３０％以上、７０％以下であることを特徴とする。【選択図】図１