DataVXACS Energy LettersPaper
journal article·2023-11-10

Converting Residual Alkali into Sodium Compensation Additive for High-Energy Na-Ion Batteries

Tao Zhang, Ji Kong, Chao Shen, Shengjie Cui, Zezhou Lin, Yuyu Deng, Minghao Song, Lifang Jiao, Haitao Huang, Ting Jin, Keyu Xie

ACS Energy Letters· Volume 8· Issue 11
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Source abstract

Abstract

Sodium-ion batteries (SIBs) have attracted widespread attention in large-scale electrical energy storage. However, the dissolution of the solid–electrolyte interphase (SEI) and the abundant defect sites in hard carbon (HC) lead to serious Na + loss in sodium-ion full cells, limiting the energy density and cycle life of SIBs. Here, we introduce acetic acid (AC) in layered cathode materials to neutralize the residual alkali species and form sodium acetate (AC-Na). AC-Na possesses a high specific capacity of ∼300 mAh g –1 and serves as the Na compensation additive with ∼92% capacity utilization and an appropriate oxidation potential (∼4.1 V). On the basis of sodium compensation, the 2.0 Ah P2-Na 0.85 Li 0.12 Ni 0.22 Mn 0.66 O 2 @AC||HC pouch cell affords a capacity retention of 95.1% over 120 cycles, with the energy density improved from 112 to 130 Wh kg –1 (based on the mass of the cell core). The high-efficiency sodium compensation strategy opens up a new route to enable high-energy SIBs for practical application.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, China

Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong 999077, China

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCast), College of Chemistry, Nankai University, Tianjin 300071, China

Funding

Natural Science Foundation of Chongqing Municipality · Natural Science Basic Research Program of Shaanxi Province · Ministry of Human Resources and Social Security · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Hong Kong Polytechnic University

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