상세정보
학술지
Revisiting TiS 2 as a Diffusion-dependent Cathode with Promising Energy Density for All-solid-state Lithium Secondary Batteries
- 발행일
- 202110
- 출처
- Energy Storage Materials, v.41, pp.289-296
- ISSN
- 2405-8297
- 출판사
- Elsevier
- 협약과제
- 21JB3100, 나노입자의 차원 제어를 통한 흑연/고체전해질 복합체 기반의 3차원 구조 음극 설계 및 조성 최적화, 이영기
- 초록
- All-solid-state lithium batteries require a well-designed electrode structure to efficiently charge and discharge active materials. Mimicking electrodes impregnated with liquid electrolyte in lithium-ion batteries, composite-type all-solid-state electrodes have been widely utilized. An alternative electrode configuration is the diffusion-dependent electrode, which consists mostly of active material. Unlike the composite electrode, which uses lithium-ion transport via a percolated solid electrolyte, the diffusion-dependent electrode uses interparticle lithium-ion diffusion through active material particles with a seamless interface. In this design, the energy density dramatically increases owing to the increased content of active material in the electrode. Herein, titanium disulfide (TiS2) is systematically explored as an appropriate material applicable as a diffusion-dependent cathode owing to its outstanding mechanical and electrochemical properties. Based on the morphology-based study of TiS2 particles, the diffusion-dependent cathode composed of spherical TiS2 nanoparticles stably delivers high areal and volumetric capacities of ~ 9.43 mAh/cm2 and ~ 578 mAh/cm3, respectively, at a loading level of 45.6 mg/cm2, which corresponds to specific energy densities of 414 Wh/kgelectrode and 1155 Wh/Lelectrode. The proposed TiS2 electrode, which can be fabricated by a practical slurry-based process using a conventional binder and solvent, is a strong candidate as a cathode for commercially available all-solid-state lithium batteries.
- KSP 제안 키워드
- Active materials, All-solid-state electrodes, All-solid-state lithium batteries, All-solid-state lithium secondary batteries, Composite Electrode, Electrode structure, Energy density, Ion batteries, Liquid electrolyte, Lithium-ion diffusion, Seamless interface