Fabrication of heteroatom-doped cobalt oxide yolk-shell microsphere using recycled solution from waste materials and their excellent electrochemical properties as an anode material for lithium-ion batteries  

作　　者：Yeong Beom Kim Chanho Kim Seung-Hyun Kim Yun Chan Kang Dongju Lee Gi Dae Park 

机构地区：[1]Department of Advanced Materials Engineering,Chungbuk National University,Chungbuk 28644,Korea [2]Department of Materials Science and Engineering,Korea University,Seoul 136-713,Korea [3]Research Institute,YKSintering Co.,Ltd.,Chungbuk 28581,Korea

出　　处：《Rare Metals》2024年第10期4934-4947,共14页稀有金属（英文版）

基　　金：financially supported by the National Research Foundation of Korea(NRF)from the Korea Government(MEST,No.NRF-2022R1F1A1070886;MSIT,No.RS2023-00217581);the Commercialization Promotion Agency for R&D Outcomes(COMPA)from the Korea Government(MEST,No.1711175258)。

摘　　要：Heteroatom-doped transition metal oxides have attracted great attention as advanced anode materials for lithium-ion batteries due to their high theoretical capacity and superior properties.However,the limited resource availability has led to a substantial rise in prices for valuable metals such as Ni and Co,posing a significant challenge for their application.To address this issue,recycling of these metals from waste materials have gained prominence,and particularly the recovery of Co has been mostly focused on its economic benefits.Herein,we introduced a novel recycling strategy for fabrication of heteroatomdoped CoO_(x)(comprising mainly Co_(3)O_(4)with a minor CoO phase)anode with a yolk–shell structure for lithium-ion batteries,by separating Co from cemented tungsten carbide waste.By employing a simple leaching process and subsequent spray pyrolysis,the yolk–shell structured microsphere comprising CoO_(x)was successfully synthesized.Moreover,the presence of other waste metals in the leachate facilitated multi-heteroatom doping during synthesis.Interestingly,the introduction of various dopants into CoO_(x)induced oxygen vacancy formation,thereby enhancing the electrochemical properties of the CoO_(x)anode.As a result,compared with the phase-pure(undoped)CoO_(x)yolk–shell,the heteroatom-doped CoO_(x)yolk–shell exhibited robust cycling stability(602 mAh·g^(-1)for 200 cycles at 1 A·g^(-1))and excellent rate capability(210 mAh·g^(-1)at 10 A·g^(-1)).

关 键 词：Recycling Heteroatom doping Cobalt oxide Anode Lithium-ion batteries 

分 类 号：O646[理学—物理化学] TM912[理学—化学]