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Dextran Sulfate Lithium as Versatile Binder to Stabilize High-Voltage LiCoO2 to 4.6 V
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-09-12 , DOI: 10.1002/aenm.202101864 He Huang 1 , Zhiqiang Li 1 , Shuai Gu 1 , Juncao Bian 1 , Yingzhi Li 1 , Jingjing Chen 1 , Kemeng Liao 1 , Qingmeng Gan 1 , Yanfang Wang 1 , Sisi Wu 1 , Zhenyu Wang 1 , Wen Luo 1 , Rui Hao 1 , Zhiqiang Wang 1 , Guoyu Wang 1 , Zhouguang Lu 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-09-12 , DOI: 10.1002/aenm.202101864 He Huang 1 , Zhiqiang Li 1 , Shuai Gu 1 , Juncao Bian 1 , Yingzhi Li 1 , Jingjing Chen 1 , Kemeng Liao 1 , Qingmeng Gan 1 , Yanfang Wang 1 , Sisi Wu 1 , Zhenyu Wang 1 , Wen Luo 1 , Rui Hao 1 , Zhiqiang Wang 1 , Guoyu Wang 1 , Zhouguang Lu 1
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High-voltage LiCoO2 is an attractive cathode for ultra-high energy lithium-ion batteries in the 5G era. However, the practical application of LiCoO2 is largely hindered by the unstable structure under high voltage. Herein, dextran sulfate lithium (DSL) is used as a versatile binder to improve the cycling stability of LiCoO2 at 4.6 V. A coulombic efficiency of almost 100% and 93.4% capacity retention after 100 cycles has been achieved. The aqueous DSL binder can be evenly coated onto the surfaces of LiCoO2 particles to function as an artificial interface, significantly preventing the decomposition of electrolyte and the dissolution of Co ions. More importantly, the superior interaction between the sulfate acid groups of DSL chains and the LiCoO2 particles enhances the stability of CoO chemical bonds, further suppressing the detrimental phase transition from O3 to H1-3 above 4.55 V. The stabilization of high-voltage LiCoO2 through the binder is facile and enlightening to design high energy battery materials.
中文翻译：
葡聚糖硫酸锂作为多功能粘合剂将高压 LiCoO2 稳定到 4.6 V
高压LiCoO 2是5G时代超高能锂离子电池极具吸引力的正极。然而，LiCoO 2的实际应用在很大程度上受到高压下不稳定结构的阻碍。在此，硫酸葡聚糖锂 (DSL) 用作通用粘合剂以提高 LiCoO 2在 4.6 V 下的循环稳定性。实现了近 100% 的库仑效率和 100 次循环后的 93.4% 容量保持率。水性DSL粘合剂可以均匀地涂覆在LiCoO 2的表面上颗粒起到人工界面的作用，显着防止电解质的分解和 Co 离子的溶解。更重要的是，DSL 链的硫酸基团与 LiCoO 2颗粒之间的优异相互作用增强了 Co O 化学键的稳定性，进一步抑制了从 O3 到 H1-3 的有害相变高于 4.55 V。通过粘合剂的电压 LiCoO 2对设计高能电池材料具有启发性和启发性。
更新日期：2021-09-12
中文翻译：
葡聚糖硫酸锂作为多功能粘合剂将高压 LiCoO2 稳定到 4.6 V
高压LiCoO 2是5G时代超高能锂离子电池极具吸引力的正极。然而，LiCoO 2的实际应用在很大程度上受到高压下不稳定结构的阻碍。在此，硫酸葡聚糖锂 (DSL) 用作通用粘合剂以提高 LiCoO 2在 4.6 V 下的循环稳定性。实现了近 100% 的库仑效率和 100 次循环后的 93.4% 容量保持率。水性DSL粘合剂可以均匀地涂覆在LiCoO 2的表面上颗粒起到人工界面的作用，显着防止电解质的分解和 Co 离子的溶解。更重要的是，DSL 链的硫酸基团与 LiCoO 2颗粒之间的优异相互作用增强了 Co O 化学键的稳定性，进一步抑制了从 O3 到 H1-3 的有害相变高于 4.55 V。通过粘合剂的电压 LiCoO 2对设计高能电池材料具有启发性和启发性。
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