ELECTRODE MATERIAL COMPOSITE STRUCTURE, ELECTRODE, LITHIUM ION BATTERY, AND ELECTRODE MANUFACTURING METHOD

• Main Authors: CONSTANTIN I STEFAN, RAINER J FASCHING, HAN SONG, LIU ZUQIN, GHYRN E LOVENESS
• Format: Patent
• Language: English; Japanese
• Published: 15.02.2018
• 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 novel electrode material composite structures containing a high-capacity active materials, and formed into porous base structures.SOLUTION: The structure 100 comprises shells 140 that encapsulate these porous base structures 120. During lithiation of an active material, the shell 140 mechanically constrains the porous base structure 120. The shell 140 allows lithium ions to pass therethrough but prevents electrolyte solvent from interacting with the encapsulated active material. The shell 140 contains carbon, and the porous base structure 120 contains silicon. Although silicon tends to swell during lithiation, the porosity of the base structure and/or void spaces inside the shell helps to accommodate this additional volume within the shell without breaking the composite structure 100 or substantially increasing the overall size of the composite structure.SELECTED DRAWING: Figure 1 【課題】多孔性基板構造体として形成される、高容量活物質を含有する新規の電極物質複合構造体を提供する。【解決手段】構造体１００は、これら多孔性基板構造体１２０を封入するシェル１４０も含む。活物質のリチウム化の間、シェル１４０は多孔性基板構造体１２０を機械的に束縛する。シェル１４０は、リチウムイオンを通過させながら、封入された活物質と電解質溶媒が相互作用するのを妨げる。シェル１４０は炭素を含有し、多孔性基板構造体１２０はシリコンを含有する。シリコンはリチウム化の間、膨張しやすいが、基板構造体の多孔率および／またはシェル内の空隙空間により、複合構造体１００の破壊、または全体サイズの実質的な増加を引き起こすことなく、シェル内の体積の増加が許容される。【選択図】図１