Abstract:
본 발명은 폴리에틸렌이마인이 부착된 카본나노튜브; 폴리에틸렌이마인이 부착된 카본나노튜브에 주입된 황(S); 및 카본나노튜브의 외곽에 형성된 이산화망간(MnO 2 ); 을 포함하는 리튬-황 이차전지용 양극재료에 관한 것이다. 이에 의하여, 리튬 폴리설파이드(LiPS, lithium polysulfides)를 흡착하여 셔틀링 반응을 억제하고, 리튬 폴리설파이드의 재사용률을 증가시켜 결과적으로 전지의 수명특성 및 율특성을 향상시킬 수 있고, 양극재료를 3D 전류집전체에 코팅한 양극을 사용함으로써 사이클 특성을 향상시킬 수 있다.
Abstract:
A method for manufacturing a hollow carbon sphere according to an embodiment of the present invention comprises the process of manufacturing a hollow carbon sphere with micropores using a material including template particles and metal-phthalocyanine. A carbon shell-sulfur composite can be manufactured by embedding sulfur inside the hollow carbon sphere and the manufactured hollow carbon sphere can be used as the cathode material of a lithium-sulfur secondary battery as the manufactured hollow carbon sphere has a carbon wall surface with micropores. The carbon-sulfur composite material manufactured according to the method can increase the very low electroconductivity of sulfur, can prevent lithium polysulfide with a long chain structure from being dissolved in electrolyte by confining sulfur and lithium polysulfide, which is derived from sulfur, inside a carbon shell having micropores distributed thereon, can minimize shuttle reaction, can reduce an overcharging amount between charge and discharge, and can improve the performance of a secondary battery. Moreover, the present invention provides a method for mass-producing the hollow carbon spheres and the carbon shell-sulfur composite.