리튬이차전지 음극재로서 Graphite/SiO2 합성물의 전기화학적 특성

고형신; 최정은; 이종대; Hyoung Shin Ko; Jeong Eun Choi; Jong Dae Lee

Applied Chemistry for Engineering, Vol.25, No.6, 592-597, December, 2014

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리튬이차전지 음극재로서 Graphite/SiO2 합성물의 전기화학적 특성

Electrochemical Characteristics of Lithium Ion Battery Anode Materials of Graphite/SiO2

고형신^{1, 2}, 최정은¹, 이종대 ^{2, †}

¹포스코 ESM
²충북대학교 화학공학과

Hyoung Shin Ko^{1, 2}, Jeong Eun Choi¹, and Jong Dae Lee^{2, †}

¹POSCO ESM, Gyeongbuk 730-853, Korea
²Department of Chemical Engineering, Chungbuk National University, Chungbuk 361-763, Korea

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초록

본 연구에서는 리튬이차전지의 음극활물질로 graphite의 전기화학적 특성을 향상시키기 위하여 졸-겔 법에 의한 graphite/SiO2 복합소재를 제조하였다. 제조된 graphite/SiO2 합성물은 XRD, FE-SEM과 EDX를 사용하여 분석하였다. SiO2에 의해 표면 개질된 graphite는 SEI 층을 안정화시키는데 장점을 보여 주었다. Graphite/SiO2 전극을 작업 전극으로, 리튬메탈을 상대전극으로 하여 리튬이차전지의 전기화학 특성을 조사하였다. LiPF6 염과 EC/DMC 용매를 전해질로 사용하여 제조한 코인 셀의 전기화학적 거동은 충방전, 사이클, 순환전압전류, 임피던스 테스트를 진행하여 평가하였다. Graphite/SiO2 전극을 사용한 리튬이차전지는 graphite 전극을 사용한 전지보다 우수한 특성을 보여주었으며, 0.1 C rate에서 465 mAh/g의 용량을 보여주었다. 또한 개질된 graphite 전극은 0.8 C rate에서 99%의 용량 보존율을 보여주었다.

The graphite/SiO2 composites as anode materials for lithium-ion batteries were prepared by sol-gel method to improve the graphite’s electrochemical characteristics. The prepared graphite/SiO2 composites were analysed by XRD, FE-SEM and EDX. The graphite surface modified by silicon dioxide showed several advantages to stabilize SEI layer. The electrochemical characteristics were investigated for lithium ion battery using graphite/SiO2 as the working electrode and Li metal as the counter electrode. Electrochemical behaviors using organic electrolytes (LiPF6, EC/DMC) were characterized by charge/discharge, cycle, cyclic voltammetry and impedance tests. The lithium ion battery using graphite/SiO2 electrodes had better capacity than that of using graphite electrodes and was able to deliver a discharge capacity with 475 mAh/g at a rate of 0.1 C. Also, the capacity retention ratio of the modified graphite reaches 99% at a rate of 0.8 C.

Keywords:Lithium ion battery;Anode material;Graphite;Silicon Oxide;Surface modification

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