Volume 1 Issue 4
December  2022
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Chenxi Zheng, Shijun Tang, Fangmei Wen, Jinxue Peng, Wu Yang, Zhongwei Lv, Yongmin Wu, Weiping Tang, Zhengliang Gong, Yong Yang. Reinforced cathode-garnet interface for high-capacity all-solid-state batteries[J]. Materials Futures, 2022, 1(4): 045103. doi: 10.1088/2752-5724/aca110
Citation: Chenxi Zheng, Shijun Tang, Fangmei Wen, Jinxue Peng, Wu Yang, Zhongwei Lv, Yongmin Wu, Weiping Tang, Zhengliang Gong, Yong Yang. Reinforced cathode-garnet interface for high-capacity all-solid-state batteries[J]. Materials Futures, 2022, 1(4): 045103. doi: 10.1088/2752-5724/aca110
Paper •

Reinforced cathode-garnet interface for high-capacity all-solid-state batteries

© 2022 The Author(s). Published by IOP Publishing Ltd on behalf of the Songshan Lake Materials Laboratory
Materials Futures, Volume 1, Number 4
  • Received Date: 2022-10-24
  • Accepted Date: 2022-11-08
  • Publish Date: 2022-12-09
  • Garnet-type solid-state electrolytes (SSEs) are particularly attractive in the construction of all-solid-state lithium (Li) batteries due to their high ionic conductivity, wide electrochemical window and remarkable (electro)chemical stability. However, the intractable issues of poor cathode/garnet interface and general low cathode loading hinder their practical application. Herein, we demonstrate the construction of a reinforced cathode/garnet interface by spark plasma sintering, via co-sintering Li6.5La3Zr1.5Ta0.5O12 (LLZTO) electrolyte powder and LiCoO2/LLZTO composite cathode powder directly into a dense dual-layer with 5 wt% Li3BO3 as sintering additive. The bulk composite cathode with LiCoO2/LLZTO cross-linked structure is firmly welded to the LLZTO layer, which optimizes both Li-ion and electron transport. Therefore, the one-step integrated sintering process implements an ultra-low cathode/garnet interfacial resistance of 3.9 Ω cm2 (100 °C) and a high cathode loading up to 2.02 mAh cm−2. Moreover, the Li3BO3 reinforced LiCoO2/LLZTO interface also effectively mitigates the strain/stress of LiCoO2, which facilitates the achieving of superior cycling stability. The bulk-type Li|LLZTO|LiCoO2-LLZTO full cell with areal capacity of 0.73 mAh cm−2 delivers capacity retention of 81.7% after 50 cycles at 100 μA cm−2. Furthermore, we reveal that non-uniform Li plating/stripping leads to the formation of gaps and finally results in the separation of Li and LLZTO electrolyte during long-term cycling, which becomes the dominant capacity decay mechanism in high-capacity full cells. This work provides insight into the degradation of Li/SSE interface and a strategy to radically improve the electrochemical performance of garnet-based all-solid-state Li batteries.

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