Development of rechargeable batteries in energy storage systems and electric/electronic devices has been rapidly progressed as an effort to amplify the utilization renewable and sustainable energies since the past few decades. However, increasing demand of the rechargeable batteries results in significant accumulation of battery waste materials. In the current battery recycling process, the recovery of cathode metal(oxide)s has been mainly focused, but other organic compartments were not properly recycled. In this study, the valorization of battery electrolyte was investigated. To this end, CO₂-assisted thermolysis of a broadly used battery electrolyte, LiPF₆ in carbonate solvents, was performed. First part examined liquid (carbonates, cyclic and aliphatic hydrocarbons) and gaseous products (H₂, CO, CH₄, C₂H₄, and CO₂) from thermolysis of battery electrolyte at different conditions. The complicated mixture of pyrogenic products needs additional separation processes to recover each compound. To convert the complicated mixture samples into value-added chemicals (i.e., syngas), catalytic thermolysis was done in the second part. Considering that the practical pyrolysis condition of battery electrolyte includes a cathode material during the thermolysis, a conventional cathode material (NCM 811: LiNi_0.8Co_0.1Mn_0.1O₂) was used as a catalyst. It was highly active to convert entire liquid compounds into syngas at ≤ 500 °C, and synergistic effects of catalyst and CO₂ resulted in enhanced CO formation. Given that the metallurgy process for battery operates at near 1300 °C, thermolysis of battery electrolyte could be incorporated into the metallurgy process to maximize recovery of organic and metallic compounds in spent batteries.

自过去几十年以来，为了扩大可再生能源和可持续能源的利用，储能系统和电气/电子设备中可充电电池的开发取得了迅速进展。然而，对可充电电池日益增长的需求导致电池废料的大量积累。在目前的电池回收过程中，主要集中在阴极金属（氧化物）的回收，但其他有机隔间没有得到适当的回收。在这项研究中，对电池电解质的增值进行了研究。为此，CO ₂辅助广泛使用的电池电解质 LiPF _{6 的}热解在碳酸酯溶剂中进行。第一部分检查了电池电解液在不同条件下热解产生的液体（碳酸盐、环状和脂肪烃）和气体产物（H ₂、CO、CH ₄、C ₂ H ₄和 CO ₂）。热解产物的复杂混合物需要额外的分离过程来回收每种化合物。为了将复杂的混合物样品转化为具有附加值的化学品（即合成气），第二部分进行了催化热解。考虑到电池电解液的实际热解条件包括热解过程中的正极材料，常规正极材料（NCM 811：LiNi _0.8 Co_0.1 Mn _0.1 O ₂ )用作催化剂。在≤ 500 °C 下将整个液态化合物转化为合成气具有很高的活性，催化剂和 CO _{2 的}协同作用导致 CO 形成增强。鉴于电池的冶金过程在接近 1300°C 的温度下运行，电池电解液的热解可以纳入冶金过程中，以最大限度地回收废电池中的有机和金属化合物。