A new strategy to mitigate the initial capacity loss of lithium ion batteries

JOURNAL OF POWER SOURCES

卷:324

Article

Su, Xin¹  Lin, Chikai¹  Wang, Xiaoping¹  Maroni, Victor A.¹  Ren, Yang²  Johnson, Christopher S.¹  Lu, Wenquan¹ 

[1] Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Argonne, IL 60439 USA

[2] Argonne Natl Lab, Adv Photon Source, 9700 South Cass Ave, Argonne, IL 60439 USA

关键词: Hard carbon;    Initial capacity loss;    Li5FeO4 (LFO);    Lithium source additive;    Lithium ion battery;   

DOI  :  10.1016/j.jpowsour.2016.05.063

来源: Elsevier

【 摘 要 】

Hard carbon (non-graphitizable) and related materials, like tin, tin oxide, silicon, and silicon oxide, have a high theoretical lithium delivery capacity (>550 mAh/g depending on their structural and chemical properties) but unfortunately they also exhibit a large initial capacity loss (ICL) that overrides the true reversible capacity in a full cell. Overcoming the large ICL of hard carbon in a full-cell lithium-ion battery (LIB) necessitates a new strategy wherein a sacrificial lithium source additive, such as, Li5FeO4 (LFO), is inserted on the cathode side. Full batteries using hard carbon coupled with LFO-LiCoO2 (LCO) are currently under development at our laboratory. We find that the reversible capacity of a cathode containing LFO can be increased by 14%. Furthermore, the cycle performance of full cells with LFO additive is improved from <90% to >95%. We show that the LFO additive not only can address the irreversible capacity loss of the anode, but can also provide the additional lithium ion source required to mitigate the lithium loss caused by side reactions. In addition, we have explored the possibility to achieve higher capacity with hard carbon, whereby the energy density of full cells can be increased from ca. 300 Wh/kg to >400 Wh/kg. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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