올리빈형 LiFe0.965Cr0.03B0.005PO4 and LiFe0.965Cr0.03Al0.005PO4 분말의 전기전도도
Electrical conductivity of olivine type LiFe0.965Cr0.03B0.005PO4 and LiFe0.965Cr0.03Al0.005PO4 powders
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초록
크롬이 도핑된 LiFePO4 분말이 도핑되지 않은 것보다 이차전지용 양극활물질로서 우수한 전기화학적 특성을나타내었다. 이러한 향상은 도핑에 의해서 양극활물질의 전자전도도가 높아지기 때문인 것으로 생각되고 있다. 크롬과 또하나의 전형원소가 도핑된 LiFe0.965Cr0.03B0.005PO4와 LiFe0.965Cr0.03Al0.005PO4의 전기전도도를 30에서 80oC 범위에서 측정하였다. 도핑된 분말은 유성밀에 의한 기계화학적 혼합을 한 후 675~750oC에서 5~10시간 열처리하여 합성하였다. 이러한 도핑은분말의 전기전도도를 높이고 입자 성장을 촉진시켰다. 크롬과 알루미늄이 도핑된 LiFe0.965Cr0.03Al0.005PO4 분말의 30oC에서의전기전도도는 1 × 10−8S/cm이었으며, 이 값은 도핑하지 않은 것보다 두 자릿수 높은 값 이었다.
Abstract
LiFePO4 doped with Cr showed improved electrochemical properties as a cathode material of lithium-ion batteries compared to the undoped. The improvement was thought that the doping would raise the electronic conductivity of the compounds. The electrical conductivity of LiFe0.965Cr0.03B0.005PO4 and LiFe0.965Cr0.03Al0.005PO4 powder was measured in the temperature range from 30 to 80oC. The doped powders were synthesized via mechanochemical milling and subsequent heat treatment at 675~750oC for 5~10 h. The doping enhanced grain growth and electrical conductivity. The electrical conductivity of the LiFe0.965Cr0.03Al0.005PO4 powder at 30oC was 1 × 10−8S/cm, which was higher two orders of magnitude than that of the undoped.
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