50C Fast-Charge Li-Ion Batteries using a Graphite Anode

Chuangchao Sun; Xiao Ji; Suting WengRuhong LiXiaoteng HuangChunnan ZhuXuezhang XiaoTao DengLiwu FanLixin ChenXuefeng WangChunsheng WangXiulin Fan

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50C Fast-Charge Li-Ion Batteries using a Graphite Anode

机译：50C Fast-Charge Li-Ion Batteries using a Graphite Anode

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Li-ion batteries have made inroads into the electric vehicle market withhigh energy densities, yet they still suffer from slow kinetics limited by thegraphite anode. Here, electrolytes enabling extreme fast charging (XFC) of amicrosized graphite anode without Li plating are designed. Comprehensivecharacterization and simulations on the diffusion of Li~+ in the bulk electrolyte,charge-transfer process, and the solid electrolyte interphase (SEI) demonstratethat high ionic conductivity, low desolvation energy of Li~+, and protective SEIare essential for XFC. Based on the criterion, two fast-charging electrolytesare designed: low-voltage 1.8 m LiFSI in 1,3-dioxolane (for LiFePO_4graphitecells) and high-voltage 1.0 m LiPF_6 in a mixture of 4-fluoroethylene carbonateand acetonitrile (7:3 by vol) (for LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2graphite cells). Theformer electrolyte enables the graphite electrode to achieve 180 mAh g~(?1) at50C (1C = 370 mAh g~(?1)), which is 10 times higher than that of a conventionalelectrolyte. The latter electrolyte enables LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2graphite cells(2 mAh cm~(?2), N/P ratio = 1) to provide a record-breaking reversible capacityof 170 mAh g~(?1) at 4C charge and 0.3C discharge. This work unveils the keymechanisms for XFC and provides instructive electrolyte design principles forpractical fast-charging LIBs with graphite anodes.

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来源
《Advanced Materials》 |2022年第43期|2206020.1-2206020.11|共11页
作者
Chuangchao Sun; Xiao Ji; Suting WengRuhong LiXiaoteng HuangChunnan ZhuXuezhang XiaoTao DengLiwu FanLixin ChenXuefeng WangChunsheng WangXiulin Fan;
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作者单位

State Key Laboratory of Silicon MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027, P. R. China;

Department of Chemical and Biomolecular EngineeringUniversity of MarylandCollege Park, MD 20742, USA;

Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190, P. R. ChinaInstitute of Thermal Science and Power SystemsSchool of Energy EngineeringZhejiang UniversityHangzhou 310027, P. R. ChinaState Key Laboratory of Silicon MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027, P. R. China, Key Laboratory of Advanced Materials and Applicationsfor Batteries of Zhejiang ProvinceHangzhou 310013, P. R. ChinaBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190, P. R. China, Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd.Liyang 213300, P. R. China;

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正文语种英语
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electrolytes; fast-charging; graphite anodes; Li-ion batteries;

50C Fast-Charge Li-Ion Batteries using a Graphite Anode

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