[논문]복합 정제 공정에 따른 천연 흑연의 물리화학적 특성 변화가 리튬 이온 전지의 음극재 성능에 미치는 영향

안원준; 황진웅; 임지선; 강석창

doi:10.14478/ace.2021.1029

복합 정제 공정에 따른 천연 흑연의 물리화학적 특성 변화가 리튬 이온 전지의 음극재 성능에 미치는 영향
Effect of Characteristic Change in Natural Graphite according to Complex Purification Process on Anode Performance for Lithium Ion Battery 원문보기

공업화학 = Applied chemistry for engineering, v.32 no.3, 2021년, pp.290 - 298

안원준 (한국화학연구원 C1가스탄소융합연구센터) , 황진웅 (한국화학연구원 C1가스탄소융합연구센터) , 임지선 (한국화학연구원 C1가스탄소융합연구센터) , 강석창 (한국화학연구원 C1가스탄소융합연구센터)

초록
AI-Helper

천연 흑연의 음극재 적용을 위하여 정제 공정을 실시하였으며, 공정에 따른 흑연의 구조적 변화와 불순물 함량이 음극 특성에 미치는 영향을 고찰하였다. 천연 흑연은 불화암모늄과 황산을 동일 비로 하여 사용량을 달리한 산처리 및 온도(800~2500 ℃)를 달리한 열처리를 통하여 화학적/물리적으로 정제되었다. 산을 이용한 불순물 제거는 한계가 있었으며, 이후 진행된 2500 ℃까지의 열처리를 통해 Si과 같은 일부 원소를 제외하고 대부분의 불순물이 전량 제거되는 것을 확인하였다. 복합 정제 공정에 따라 제조된 흑연 음극재의 특성이 향상되었으며, 구조와 불순물 함량 변화는 각각 용량 및 속도 특성과 초기 쿨롱 효율에 지배적인 영향을 미쳤다. 복합 정제 공정은 흑연 구조를 향상시켰으며, 불순물을 효율적으로 제거하여 SEI층 형성 억제 및 Li⁺ 삽입 공간 확대를 통해 리튬 이온 전지의 성능을 향상시켰다.

Abstract ▼ AI-Helper

A purification process was performed for the application of natural graphite as an anode material. The influence of the structural change and impurity content of graphite according to the process on the anode electrochemical characteristics was investigated. Natural graphite was chemically/physically purified by acid-treatment which used different amounts of solution of ammonium fluoride/sulfuric acid in the same ratio and thermal treatment used different temperatures (800~2500 ℃). Acid-treatment had limitation to remove impurities, and identified that all impurity contents was removed except some traces of atom such as Si by after progressed thermal-treatment until 2500 ℃. The anode materials characteristic of graphite treated by purification process was improved, and changes in the structure and impurity contents affected dominantly the capacity, rate property and initial Coulombic efficiency. Consequently, the complex purification process improved the graphite structure and also the performance of lithium ion battery by controlling the excessive formation of solid electrolyte interphase and expanding Li+ insertion space originated from the effective removal of impurities.

주제어

표/그림 (14)

표 Table S1. Boiling Point of Impurity that exist in Nature
표 Table 1. Sample Nomenclature and Definition
그림 Figure 1. Impurity contents according to acid concentration (a), reaction time with 20 wt% acid (b) and temperature of heat treatment.
그림 Figure 2. XRD pattern (a), Raman spectra (b) and interlayer distance-I_D/I_g ratio (c) of graphite depending on purification process.
표 Table S2. Impurity Content According to Acid-treatment Concentration, Reaction Time and Thermal-treatment Temperature
표 Table S3. Results of XRD, Raman Spectra Analysis for Purification Process
그림 Figure 3. Purified samples of specific capacity and initial coulombic efficiency.
표 Table 2. Electrochemical Performance of Samples according to Purification Process
그림 Figure 4. Discharge curve with voltage range (a) and schematic diagram lithium ion insertion mechanism in graphite (b).
그림 Figure S1. SEM image of untreated natural graphite (a) and acid treatment natural graphite 20 wt% concentrate acid concentration.
표 Table 3. Specific Capacity Range each Lithium Insertion Steps according to Voltage
그림 Figure 5. Si 2p (a), Al 2p (b), Fe 2p (c), C1s (d) and O1s (e) spectra of fresh and purified samples.
그림 Figure 6. Si2p (a), Al2p (b), Fe2p (c) and O1s (d) spectra of fresh and purified samples after cell test.
표 Table S4. Elemental Composition (in Atomic Percentage) of Samples for XPS Spectra

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