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Acta Chimica Sinica >

2020 , Vol. 78 >Issue 12: 1426 - 1433

DOI: https://doi.org/10.6023/A20070330

Article

In-situ Li3PO4 Coating of Li-Rich Mn-Based Cathode Materials for Lithium-ion Batteries

  • Liu Jiuding ,
  • Zhang Yudong ,
  • Liu Junxiang ,
  • Li Jinhan ,
  • Qiu Xiaoguang ,
  • Cheng Fangyi
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  • a Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China;
    b Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300071, China;
    c Engineering Research Center of High-efficiency Energy Storage (Ministry of Education), Nankai University, Tianjin 300071, China

Received date: 2020-07-28

  Online published: 2020-10-12

Supported by

Project supported by the Ministry of Science and Technology of the People's Republic of China (No. 2016YFA0202503) and the National Natural Science Foundation of China (Nos. 21925503, 21835004).

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Abstract

Lithium-rich manganese-based oxides (LRMO) are promising cathode materials to build next generation lithium-ion batteries because of high capacity and low cost. However, the severe capacity fade and voltage decay, which originate from surface oxygen loss, side reactions and irreversible phase transformation, restrict their practical application. Proposed approaches to address these issues include electrolyte modification, synthesis condition optimization, tuning elemental composition, bulk doping and surface coating. Surface coating has been proved to be an effective method to stabilize the interface between LRMO and electrolyte. Herein, we report a facile approach to synthesize Li3PO4-coated LRMO (LRMO@LPO) by in-situ carbonate-phosphate precipitate conversion reaction. The formation of Li3PO4 layer and its contribution to enhanced electrochemical performance are investigated in detail. Transmission electron microscopy (TEM) reveals that the surface of carbonate precursor converts to Ni3(PO4)2 after reacting with Na2HPO4 solution, which finally transforms to Li3PO4 coating layer with thickness below 30 nm during calcination process. Quinoline phosphomolybdate gravimetric method gives the optimal Li3PO4 coating content of 0.56%. The modified LRMO@LPO sample exhibits improved cycling stability (191.1 mAh·g-1 after 175 cycles at 0.5C between 2.0~4.8 V and 81.8% capacity retention) and suppressed voltage decay (1.09 mV per cycle), compared with bare LRMO material (72.9% capacity retention, 1.78 mV per cycle). The electrodes are studied by galvanostatic intermittent titration technique, electrochemical impedance spectroscopy, TEM and inductively coupled plasma atomic emission spectrometry. The results suggest efficient mitigation of phase transformation and dissolution of transition metal in LRMO@LPO. As a coating material with lithium-ion conductivity, Li3PO4 not only acts as a physical barrier to inhibit side reaction between the electrolyte and LRMO, but also promotes lithium ion transport at the surface region of cathode. The in-situ surface modification approach simplifies the traditional post coating process, and may provide new insight to build stable and low cost Li-rich cathode for lithium-ion batteries.

Key words： Li-rich Mn-based cathode materials; lithium ion battery; Li3PO4; in-situ coating; precipitate conversion

Cite this article

Liu Jiuding , Zhang Yudong , Liu Junxiang , Li Jinhan , Qiu Xiaoguang , Cheng Fangyi . In-situ Li3PO4 Coating of Li-Rich Mn-Based Cathode Materials for Lithium-ion Batteries[J]. Acta Chimica Sinica, 2020 , 78(12) : 1426 -1433 . DOI: 10.6023/A20070330

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