Effect of carbon addition on one-step mechanical synthesis of LiCoPO₄/C composite granules and their powder characteristics

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• 作者：Mitsuaki Matsuoka^a ; Akira Kondo^a ; Takahiro Kozawa^a ; ^{t-kozawa@jwri.osaka-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Makio Naito^a ; Hideyuki Koga^b ; Toshiya Saito^b ; Hideki Iba^b
• 关键词：Mechanical synthesis ; LiCoPO4 ; Composite granule ; Cathode ; Lithium-ion battery
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：938-943
• 全文大小：1673 K

文摘

Lithium cobalt phosphate, LiCoPO₄, has attracted much attention as a high voltage cathode material in lithium-ion batteries (LIBs). Since this material suffers from very low ion and electron conductivities, the composite structure made with nano-sized LiCoPO₄ and carbon can be effectively used as a cathode material. Here, we report a simple mechanical synthesis route for preparing LiCoPO₄/C composite granules. The raw materials for LiCoPO₄ and carbon were mechanically treated with an attrition-type mill for producing LiCoPO₄/C composite granules using a one-step process without employing external heating. With an increase in the amount of carbon used, the primary particle size of LiCoPO₄ and the median size of granules were decreased. The first discharge capacity obtained for the LiCoPO₄/C prepared with 5 mass% carbon was 105 mA h g⁻¹, whereas a value of up to 134 mA h g⁻¹ was obtained for the composite with 10 mass% carbon. We examined the effect of carbon addition on the mechanical synthesis and characteristics of LiCoPO₄ powders.